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Ma X, Han J, Zhou H, Lv T, Mu Y, Liu H, Li L. Two-dimensionally high AR performance beam scanning utilizing randomly-rotated single-PIN-diode elements for circularly-polarized programmable metasurface. OPTICS EXPRESS 2024; 32:15041-15052. [PMID: 38859164 DOI: 10.1364/oe.520680] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/01/2024] [Accepted: 03/22/2024] [Indexed: 06/12/2024]
Abstract
In this paper, we introduce a novel technique that utilizes randomly rotated elements (RREs) for the cross-polarization and axial ratio (AR) control of a circularly polarized programmable metasurface (CPPMS). We evaluate the CPPMS performance by comparing RREs layout with uniform elements (UEs) layout, and analyze far-field radiation parameters for 50 groups of CPPMS with different RREs layouts. Simulation results demonstrate consistent and improved performance across various RREs layouts, showcasing reduced cross-polarization and enhanced AR beamwidth. To validate these findings, we design a 1-bit CPPMS in Ku-band comprising 20 × 20 elements with the optimal RREs layout, and conduct measurements in an anechoic chamber. The CPPMS prototype achieves high gain (22.34 dBi), low cross-polarization (-20.5 dB), and a narrow 3 dB AR beamwidth (8.93°). Notably, it offers wide-angle beam scanning capabilities of up to ±60°. The gain bandwidth at -3 dB ranges from 14.54 to 16.65 GHz, with a relative bandwidth of 7.3%, while the 3 dB AR bandwidth extends from 14.24 to 16.07 GHz. Consequently, the proposed 1-bit CPPMS exhibits high-performance two-dimensional AR beam scanning, presenting promising applications in satellite communications.
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2
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Siegel J, Kim S, Fortman M, Wan C, Kats MA, Hon PWC, Sweatlock L, Jang MS, Brar VW. Electrostatic steering of thermal emission with active metasurface control of delocalized modes. Nat Commun 2024; 15:3376. [PMID: 38643246 PMCID: PMC11032313 DOI: 10.1038/s41467-024-47229-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2023] [Accepted: 03/25/2024] [Indexed: 04/22/2024] Open
Abstract
We theoretically describe and experimentally demonstrate a graphene-integrated metasurface structure that enables electrically-tunable directional control of thermal emission. This device consists of a dielectric spacer that acts as a Fabry-Perot resonator supporting long-range delocalized modes bounded on one side by an electrostatically tunable metal-graphene metasurface. By varying the Fermi level of the graphene, the accumulated phase of the Fabry-Perot mode is shifted, which changes the direction of absorption and emission at a fixed frequency. We directly measure the frequency- and angle-dependent emissivity of the thermal emission from a fabricated device heated to 250 °C. Our results show that electrostatic control allows the thermal emission at 6.61 μm to be continuously steered over 16°, with a peak emissivity maintained above 0.9. We analyze the dynamic behavior of the thermal emission steerer theoretically using a Fano interference model, and use the model to design optimized thermal steerer structures.
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Affiliation(s)
- Joel Siegel
- Department of Physics, University of Wisconsin-Madison, Madison, WI, USA
| | - Shinho Kim
- School of Electrical Engineering, Korea Advanced Institute of Science and Technology, Daejeon, Republic of Korea
| | - Margaret Fortman
- Department of Physics, University of Wisconsin-Madison, Madison, WI, USA
| | - Chenghao Wan
- Department of Electrical and Computer Engineering, University of Wisconsin-Madison, Madison, WI, USA
| | - Mikhail A Kats
- Department of Electrical and Computer Engineering, University of Wisconsin-Madison, Madison, WI, USA
| | | | | | - Min Seok Jang
- School of Electrical Engineering, Korea Advanced Institute of Science and Technology, Daejeon, Republic of Korea.
| | - Victor Watson Brar
- Department of Physics, University of Wisconsin-Madison, Madison, WI, USA.
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3
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Niu J, Hui Q, Mo W, Yao Q, Gong H, Tian R, Zhu A. A dual functional tunable terahertz metamaterial absorber based on vanadium dioxide. Phys Chem Chem Phys 2024; 26:10633-10640. [PMID: 38511282 DOI: 10.1039/d4cp00081a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/22/2024]
Abstract
A dual-functional switchable metamaterial absorber (MMA) based on vanadium dioxide (VO2), which achieves flexible switching between broadband absorption and four-band absorption by adjusting the VO2 conductivity, was proposed. The device has a broadband absorption function when VO2 is in the metal phase, and the conductivity is 3 × 105 S m-1. Numerical simulation shows that the absorption rate of the device reaches over 90% in the frequency range of 3.36-6.98 THz. The absorber exhibits polarization insensitivity and wide-angle absorption to transverse electric (TE) and transverse magnetic (TM) waves. When VO2 is in the insulator phase, and the conductivity is 3 × 102 S m-1, the device switches to a narrowband absorber with a band-efficient absorption function. Numerical simulation shows that the device has an absorption rate of 99.7% at 2.39 THz, 98.3% at 2.83 THz, 95.6% at 3.84 THz, and 96.1% at 4.61 THz. It can be used as a sensor with high sensitivity. In addition, to verify the absorption mechanism of the absorber, we introduced impedance matching theory to analyze the device. Finally, the influence of structural parameters on the performance of resonators was investigated. Through the joint action of multi-layer structures, the proposed MMA concentrates broadband and narrowband absorption functions on one device, achieving flexible switching between tasks without changing the structure. The switchable metamaterial absorber designed through simple tuning methods has broad application prospects in stealth technology and thermal emitters. It provides a wide range of ideas for the design of terahertz functional devices.
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Affiliation(s)
- Junhao Niu
- Guangxi Key Laboratory of Automatic Detecting Technology and Instruments, Guilin University of ElectronicTechnology, Guilin 541004, China.
| | - Qiang Hui
- Guangxi Key Laboratory of Automatic Detecting Technology and Instruments, Guilin University of ElectronicTechnology, Guilin 541004, China.
| | - Wei Mo
- Guangxi Key Laboratory of Automatic Detecting Technology and Instruments, Guilin University of ElectronicTechnology, Guilin 541004, China.
| | - Qianyu Yao
- Guangxi Key Laboratory of Automatic Detecting Technology and Instruments, Guilin University of ElectronicTechnology, Guilin 541004, China.
| | - Haozhuo Gong
- Guangxi Key Laboratory of Automatic Detecting Technology and Instruments, Guilin University of ElectronicTechnology, Guilin 541004, China.
| | - Renfang Tian
- Guangxi Key Laboratory of Automatic Detecting Technology and Instruments, Guilin University of ElectronicTechnology, Guilin 541004, China.
| | - Aijun Zhu
- Guangxi Key Laboratory of Automatic Detecting Technology and Instruments, Guilin University of ElectronicTechnology, Guilin 541004, China.
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4
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Ko JH, Seo DH, Jeong HH, Kim S, Song YM. Sub-1-Volt Electrically Programmable Optical Modulator Based on Active Tamm Plasmon. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2024; 36:e2310556. [PMID: 38174820 DOI: 10.1002/adma.202310556] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/11/2023] [Revised: 11/26/2023] [Indexed: 01/05/2024]
Abstract
Reconfigurable optical devices hold great promise for advancing high-density optical interconnects, photonic switching, and memory applications. While many optical modulators based on active materials have been demonstrated, it is challenging to achieve a high modulation depth with a low operation voltage in the near-infrared (NIR) range, which is a highly sought-after wavelength window for free-space communication and imaging applications. Here, electrically switchable Tamm plasmon coupled with poly(3,4-ethylenedioxythiophene):polystyrene sulfonate (PEDOT:PSS) is introduced. The device allows for a high modulation depth across the entire NIR range by fully absorbing incident light even under epsilon near zero conditions. Optical modulation exceeding 88% is achieved using a CMOS-compatible voltage of ±1 V. This modulation is facilitated by precise electrical control of the charge carrier density through an electrochemical doping/dedoping process. Additionally, the potential applications of the device are extended for a non-volatile multi-memory state optical device, capable of rewritable optical memory storage and exhibiting long-term potentiation/depression properties with neuromorphic behavior.
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Affiliation(s)
- Joo Hwan Ko
- School of Electrical Engineering and Computer Science, Gwangju Institute of Science and Technology, Gwangju, 61005, Republic of Korea
| | - Dong Hyun Seo
- School of Electrical Engineering and Computer Science, Gwangju Institute of Science and Technology, Gwangju, 61005, Republic of Korea
| | - Hyeon-Ho Jeong
- School of Electrical Engineering and Computer Science, Gwangju Institute of Science and Technology, Gwangju, 61005, Republic of Korea
- Department of Semiconductor Engineering, Gwangju Institute of Science AND Technology, Gwangju, 61005, Republic of Korea
| | - Sejeong Kim
- Department of Electrical and Electronic Engineering, University of Melbourne, Victoria, 3000, Australia
| | - Young Min Song
- School of Electrical Engineering and Computer Science, Gwangju Institute of Science and Technology, Gwangju, 61005, Republic of Korea
- Department of Semiconductor Engineering, Gwangju Institute of Science AND Technology, Gwangju, 61005, Republic of Korea
- AI Graduate School, Gwangju Institute of Science and Technology, Gwangju, 61005, Republic of Korea
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5
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Wu Y, Liu L, Bo G, Li Q, Dai C, Li Z, Zhang J, Zhang X. Configurable swellability of hydrogel microstructure for structural-color-based imaging concealment/encryption. NANOSCALE 2024; 16:4289-4298. [PMID: 38349138 DOI: 10.1039/d3nr05606f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/23/2024]
Abstract
Optical information concealment/encryption technologies are of great importance to structural color applications. Although a series of responsive materials have been developed for dynamic structural color, the shortcomings of the high-quality synthesis process, the complex controlling method, and the low-resolution capability limit their practical use. Herein, we proposed a novel strategy of humidity-driven structural-color-based imaging concealment/encryption by utilizing metal-hydrogel-metal (MHM) nanocavities with configurable swellablity response to humidity change. With varied exposure doses, multi-stage MHM nanocavities with swellable hydrogel interlayers are achieved, generating dynamic structural color covering the visible spectrum. We revealed that the swelling ratio of hydrogel microstructures can be gradually adjusted between 1.05 and 2.08 by varying the exposure dose. We demonstrated that a hydrogel-based structural color image can be concealed with humidity changes by configurating swellable and non-swellable hydrogel pixels together. Furthermore, we developed the double exposure method in which the first exposure can generate pixel arrays for the deceptive image and the second exposure can locally suppress the swellablity of certain pixels. This method can highlight hidden images in a moist state, demonstrating a powerful strategy for high-density optical information encryption.
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Affiliation(s)
- Yunhui Wu
- International Research Center for EM Metamaterials and Institute of Advanced Magnetic Materials, College of Materials and Environmental Engineering, Hangzhou Dianzi University, Hangzhou, 310018, PR China.
| | - Lanlan Liu
- International Research Center for EM Metamaterials and Institute of Advanced Magnetic Materials, College of Materials and Environmental Engineering, Hangzhou Dianzi University, Hangzhou, 310018, PR China.
| | - Guohao Bo
- International Research Center for EM Metamaterials and Institute of Advanced Magnetic Materials, College of Materials and Environmental Engineering, Hangzhou Dianzi University, Hangzhou, 310018, PR China.
| | - Qiang Li
- State Key Laboratory of Modern Optical Instrumentation, College of Optical Science and Engineering, Zhejiang University, Hangzhou, 310027, China
| | - Chenjie Dai
- Electronic Information School, Wuhan University, Wuhan 430072, China
| | - Zhongyang Li
- Electronic Information School, Wuhan University, Wuhan 430072, China
| | - Jian Zhang
- International Research Center for EM Metamaterials and Institute of Advanced Magnetic Materials, College of Materials and Environmental Engineering, Hangzhou Dianzi University, Hangzhou, 310018, PR China.
| | - Xuefeng Zhang
- International Research Center for EM Metamaterials and Institute of Advanced Magnetic Materials, College of Materials and Environmental Engineering, Hangzhou Dianzi University, Hangzhou, 310018, PR China.
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6
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Rovenská K, Ligmajer F, Idesová B, Kepič P, Liška J, Chochol J, Šikola T. Structural color filters with compensated angle-dependent shifts. OPTICS EXPRESS 2023; 31:43048-43056. [PMID: 38178407 DOI: 10.1364/oe.506069] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/15/2023] [Accepted: 11/08/2023] [Indexed: 01/06/2024]
Abstract
Structural color filters use nano-sized elements to selectively transmit incident light, offering a scalable, economical, and environmentally friendly alternative to traditional pigment- and dye-based color filters. However, their structural nature makes their optical response prone to spectral shifts whenever the angle of incidence varies. We address this issue by introducing a conformal VO2 layer onto bare aluminum structural color filters. The insulator-metal transition of VO2 compensated the spectral shift of the filter's transmission at a 15° tilt with 80% efficiency. Unlike solutions that require adjustment of the filter's geometry, this method is versatile and suitable also for existing structural filters. Our findings also establish tunable materials in general as a possible solution for angle-dependent spectral shifts.
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7
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Lu C, Yang F, Gao M, Wang X, Lin Y. Cooperative Thermal-Electric Field Control of Infrared Modulation Using a Vanadium Dioxide Film-Based Modulator. ACS OMEGA 2023; 8:46399-46405. [PMID: 38107882 PMCID: PMC10720291 DOI: 10.1021/acsomega.3c02469] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/11/2023] [Revised: 09/19/2023] [Accepted: 10/31/2023] [Indexed: 12/19/2023]
Abstract
Vanadium dioxide (VO2) has garnered significant attention as a material for actively tunable infrared (IR) modulators due to its reversible and responsive modulation effect on IR radiation, which is accompanied by its intrinsic insulator-metal phase transition (IMT). Here, we propose a multilayer device structure that integrates VO2 film with microheater and interdigitated electrodes for cooperative thermal-electric field control of IMT. Our results demonstrate that while intense electric fields can trigger abrupt IMT, deep modulation of IR radiation requires energy integration through Joule heating, which limits the response time of IR transmission controlled by electric field. Thus, cooperative thermal-electric field control, which provides a constant, uniform temperature field while electrically switching the IMT, is more effective for achieving a faster response time and retaining the intrinsic modulation depth of VO2-based IR modulators. Our findings offer valuable insights for the development of VO2-based IR modulators with improved performance.
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Affiliation(s)
- Chang Lu
- Department
of Electronic Communication and Technology, Shenzhen Institute of Information Technology, Shenzhen 518029, China
- School
of Materials and Energy, University of Electronic
Science and Technology of China, Chengdu 610054, China
| | - Fan Yang
- School
of Materials and Energy, University of Electronic
Science and Technology of China, Chengdu 610054, China
| | - Min Gao
- School
of Materials and Energy, University of Electronic
Science and Technology of China, Chengdu 610054, China
| | - Xinzhong Wang
- Department
of Electronic Communication and Technology, Shenzhen Institute of Information Technology, Shenzhen 518029, China
| | - Yuan Lin
- School
of Materials and Energy, University of Electronic
Science and Technology of China, Chengdu 610054, China
- Engineering
Cooperation on Applied Medicine Research Center, University of Electronic Science and Technology of China, Chengdu 610054, China
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8
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Zhao Q, Qin X, Xu C, Zhou H, Wang BX. Broadband tunable terahertz metamaterial absorber having near-perfect absorbance modulation capability based on a patterned vanadium dioxide circular patch. APPLIED OPTICS 2023; 62:9283-9290. [PMID: 38108699 DOI: 10.1364/ao.499641] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/03/2023] [Accepted: 11/08/2023] [Indexed: 12/19/2023]
Abstract
A new tunable broadband terahertz metamaterial absorber has been designed based on patterned vanadium dioxide (V O 2). The absorber consists of three simple layers, the top V O 2 pattern layer, the middle media layer, and the bottom metal layer. Based on phase transition properties of V O 2, the designed device has excellent absorption modulation capability, achieving the functional transition from broadband absorption to near-perfect reflection. When V O 2 is in the metallic state, there are two absorption peaks observed at frequencies of 4.16 and 6.05 THz, exhibiting near-perfect absorption characteristics; the combination of these two absorption peaks gives rise to the broadband phenomenon and the absorption bandwidth, where the absorbance exceeds 90% and spans from 3.40 to 7.00 THz, with a corresponding relative absorption bandwidth of 69.23%. The impedance matching theory, near-field patterns, and surface current distributions are provided to analyze the causes of broadband absorption. Furthermore, the broadband absorption could be completely suppressed when V O 2 presents the dielectric phase, and its absorbance could be dynamically adjusted from 100% to less than 0.70%, thereby achieving near-perfect reflection. Owing to its symmetrical structure, it exhibits excellent performance in different polarization directions and at large incidence angles. Our proposed absorber may have a wide range of promising applications and can be applied in a variety of fields such as communications, imaging, sensing, and security detection.
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9
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Jia D. Evaluation on the application of conjugate materials in the sound effect and stage effect of modern dance. Front Chem 2023; 11:1256123. [PMID: 37854976 PMCID: PMC10579559 DOI: 10.3389/fchem.2023.1256123] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2023] [Accepted: 09/19/2023] [Indexed: 10/20/2023] Open
Abstract
The emergence and application of conjugate materials provide a broader space for the performance of sound and presentation effects on the modern music stage. This article compared and analyzed the application of conjugated materials and traditional methods in modern dance sound effects and stage presentation effects through experiments, found that the application of conjugated materials on modern stages had the effect of enhancing visual effects. Its overall reflectivity, color saturation, brightness, transparency, etc. remain in the range of 78%-97%, which is better than traditional methods. In addition, the use of conjugated materials can also improve auditory performance, have greater penetration and durability, and reduce the impact of external noise; in terms of audience experience and dancer experience, the average proportions also reached 87.8893% and 89.3867% respectively. In addition, it also has high temperature resistance and antibacterial effects, with a maximum temperature resistance value of 314.28°C and an antibacterial effect of 95.86%, indicating that it can still maintain stability under high temperature conditions and has a good inhibitory effect on the proliferation of bacteria and viruses. These findings will lay the foundation for further expanding the application of conjugated materials on the modern dance stage.
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Affiliation(s)
- Di Jia
- Department of Dance, School of Music, Shanxi University, Taiyuan, Shanxi, China
- Department of Performing Arts and Culture, The Catholic University of Korea, Seoul, Republic of Korea
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10
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Ling YC, Yoo SJB. Review: tunable nanophotonic metastructures. NANOPHOTONICS 2023; 12:3851-3870. [PMID: 38013926 PMCID: PMC10566255 DOI: 10.1515/nanoph-2023-0034] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/17/2023] [Accepted: 08/08/2023] [Indexed: 11/29/2023]
Abstract
Tunable nanophotonic metastructures offer new capabilities in computing, networking, and imaging by providing reconfigurability in computer interconnect topologies, new optical information processing capabilities, optical network switching, and image processing. Depending on the materials and the nanostructures employed in the nanophotonic metastructure devices, various tuning mechanisms can be employed. They include thermo-optical, electro-optical (e.g. Pockels and Kerr effects), magneto-optical, ionic-optical, piezo-optical, mechano-optical (deformation in MEMS or NEMS), and phase-change mechanisms. Such mechanisms can alter the real and/or imaginary parts of the optical susceptibility tensors, leading to tuning of the optical characteristics. In particular, tunable nanophotonic metastructures with relatively large tuning strengths (e.g. large changes in the refractive index) can lead to particularly useful device applications. This paper reviews various tunable nanophotonic metastructures' tuning mechanisms, tuning characteristics, tuning speeds, and non-volatility. Among the reviewed tunable nanophotonic metastructures, some of the phase-change-mechanisms offer relatively large index change magnitude while offering non-volatility. In particular, Ge-Sb-Se-Te (GSST) and vanadium dioxide (VO2) materials are popular for this reason. Mechanically tunable nanophotonic metastructures offer relatively small changes in the optical losses while offering large index changes. Electro-optically tunable nanophotonic metastructures offer relatively fast tuning speeds while achieving relatively small index changes. Thermo-optically tunable nanophotonic metastructures offer nearly zero changes in optical losses while realizing modest changes in optical index at the expense of relatively large power consumption. Magneto-optically tunable nanophotonic metastructures offer non-reciprocal optical index changes that can be induced by changing the magnetic field strengths or directions. Tunable nanophotonic metastructures can find a very wide range of applications including imaging, computing, communications, and sensing. Practical commercial deployments of these technologies will require scalable, repeatable, and high-yield manufacturing. Most of these technology demonstrations required specialized nanofabrication tools such as e-beam lithography on relatively small fractional areas of semiconductor wafers, however, with advanced CMOS fabrication and heterogeneous integration techniques deployed for photonics, scalable and practical wafer-scale fabrication of tunable nanophotonic metastructures should be on the horizon, driven by strong interests from multiple application areas.
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Affiliation(s)
- Yi-Chun Ling
- Department of Electrical and Computer Engineering, University of California, Davis, CA95616, USA
| | - Sung Joo Ben Yoo
- Department of Electrical and Computer Engineering, University of California, Davis, CA95616, USA
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11
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Oguntoye IO, Padmanabha S, Hinkle M, Koutsougeras T, Ollanik AJ, Escarra MD. Continuously Tunable Optical Modulation Using Vanadium Dioxide Huygens Metasurfaces. ACS APPLIED MATERIALS & INTERFACES 2023; 15:41141-41150. [PMID: 37606065 PMCID: PMC10472332 DOI: 10.1021/acsami.3c08493] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/13/2023] [Accepted: 08/15/2023] [Indexed: 08/23/2023]
Abstract
Efficient and dynamic light manipulation at small scale is highly desirable for many photonics applications. Active optical metasurfaces represent a useful way of achieving this due to their creative design potential, compact footprint, and low power consumption, paving the way toward the realization of chip-scale photonic devices with tunable optical functionality on demand. Here, we demonstrate a dynamically tunable, dual-function metasurface based on dielectric resonances in vanadium dioxide that is capable of independent active amplitude and phase control without the use of mechanical parts. Significant developments in the nanofabrication of vanadium dioxide have been shown to enable this metasurface. Gradual thermal control of the metasurface yields a computationally predicted continuously tuned amplitude modulation of 19 dB with negligible phase modulation and a continuously tuned phase modulation of 228° with negligible amplitude modulation, both at near-infrared wavelengths. Experimentally, a maximum continuously tuned amplitude modulation of 9.6 dB and phase modulation of 120° are shown, along with demonstration of stable intermediate states and repeated modulation without degradation. Reprogrammable optical functionality can thus be achieved in precisely engineered nanoantenna arrays for adaptive modulation of amplitude and phase of light for applications such as tunable holograms, lenses, and beam deflectors.
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Affiliation(s)
- Isaac O. Oguntoye
- Department of Physics and
Engineering Physics, Tulane University, New Orleans, Louisiana 70118, United States
| | - Siddharth Padmanabha
- Department of Physics and
Engineering Physics, Tulane University, New Orleans, Louisiana 70118, United States
| | - Max Hinkle
- Department of Physics and
Engineering Physics, Tulane University, New Orleans, Louisiana 70118, United States
| | - Thalia Koutsougeras
- Department of Physics and
Engineering Physics, Tulane University, New Orleans, Louisiana 70118, United States
| | - Adam J. Ollanik
- Department of Physics and
Engineering Physics, Tulane University, New Orleans, Louisiana 70118, United States
| | - Matthew D. Escarra
- Department of Physics and
Engineering Physics, Tulane University, New Orleans, Louisiana 70118, United States
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12
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Ma YL, Chen Q, Zheng YJ, Shuai CY, Fu YQ. Polarization-insensitive phase-modulated metasurface using single thermally stimulated vanadium dioxide chip. OPTICS EXPRESS 2023; 31:28816-28829. [PMID: 37710693 DOI: 10.1364/oe.496260] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/07/2023] [Accepted: 08/02/2023] [Indexed: 09/16/2023]
Abstract
Considering that typically more than two pin diodes or other tunable elements are required in the unit cell of polarization-insensitive reconfigurable metasurfaces (RMs), this paper proposes a new approach to design a polarization-insensitive RM unit using only one VO2 chip. A polarization-insensitive phase-modulated metasurface (PMM) using single VO2 chip is presented. The surface layer is composed of an outer ring and an inner cross, with a VO2 chip loaded at the connection of the cross. As the VO2 chip can be connected with the metal patch on all sides, only one VO2 chip is used in this polarization-insensitive design. By thermally controlling VO2 chips switch between low-resistance and high-resistance states, the PMM achieves a 1-bit phase shift within 180° ± 37° from 7.85 to 15 GHz. A prototype is fabricated and measured, and the measured results have verified the correction of the design and analysis of the designed PMM.
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13
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Lan F, Wang L, Zeng H, Liang S, Song T, Liu W, Mazumder P, Yang Z, Zhang Y, Mittleman DM. Real-time programmable metasurface for terahertz multifunctional wave front engineering. LIGHT, SCIENCE & APPLICATIONS 2023; 12:191. [PMID: 37550383 PMCID: PMC10406829 DOI: 10.1038/s41377-023-01228-w] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/09/2023] [Revised: 07/03/2023] [Accepted: 07/11/2023] [Indexed: 08/09/2023]
Abstract
Terahertz (THz) technologies have become a focus of research in recent years due to their prominent role in envisioned future communication and sensing systems. One of the key challenges facing the field is the need for tools to enable agile engineering of THz wave fronts. Here, we describe a reconfigurable metasurface based on GaN technology with an array-of-subarrays architecture. This subwavelength-spaced array, under the control of a 1-bit digital coding sequence, can switch between an enormous range of possible configurations, providing facile access to nearly arbitrary wave front control for signals near 0.34 THz. We demonstrate wide-angle beam scanning with 1° of angular precision over 70 GHz of bandwidth, as well as the generation of multi-beam and diffuse wave fronts, with a switching speed up to 100 MHz. This device, offering the ability to rapidly reconfigure a propagating wave front for beam-forming or diffusively scattered wide-angle coverage of a scene, will open new realms of possibilities in sensing, imaging, and networking.
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Affiliation(s)
- Feng Lan
- Sichuan THz Communication Technology Engineering Research Center, School of Electronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu, 611731, China
- Yangtze Delta Region Institute (Huzhou), University of Electronic Science and Technology of China, Huzhou, 313000, China
- Zhangjiang Laboratory, Shanghai, 201204, China
| | - Luyang Wang
- Sichuan THz Communication Technology Engineering Research Center, School of Electronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu, 611731, China
| | - Hongxin Zeng
- Sichuan THz Communication Technology Engineering Research Center, School of Electronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu, 611731, China.
| | - Shixiong Liang
- National Key Laboratory of Solid-State Microwave Devices and Circuits, Hebei Semiconductor Research Institute, Shijiazhuang, 050051, China
| | - Tianyang Song
- Sichuan THz Communication Technology Engineering Research Center, School of Electronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu, 611731, China
| | - Wenxin Liu
- Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing, 100094, China
- University of Chinese Academy of Sciences, School of Electronic, Electrical and Communication Engineering, Beijing, 101408, China
| | - Pinaki Mazumder
- Department of Electrical Engineering and Computer Science, University of Michigan, Ann Arbor, MI, 48109, USA
| | - Ziqiang Yang
- Sichuan THz Communication Technology Engineering Research Center, School of Electronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu, 611731, China
- Yangtze Delta Region Institute (Huzhou), University of Electronic Science and Technology of China, Huzhou, 313000, China
- Zhangjiang Laboratory, Shanghai, 201204, China
| | - Yaxin Zhang
- Sichuan THz Communication Technology Engineering Research Center, School of Electronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu, 611731, China.
- Yangtze Delta Region Institute (Huzhou), University of Electronic Science and Technology of China, Huzhou, 313000, China.
- Zhangjiang Laboratory, Shanghai, 201204, China.
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14
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Moitra P, Wang Y, Liang X, Lu L, Poh A, Mass TWW, Simpson RE, Kuznetsov AI, Paniagua-Dominguez R. Programmable Wavefront Control in the Visible Spectrum Using Low-Loss Chalcogenide Phase-Change Metasurfaces. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2023; 35:e2205367. [PMID: 36341483 DOI: 10.1002/adma.202205367] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/14/2022] [Revised: 11/01/2022] [Indexed: 06/16/2023]
Abstract
All-dielectric metasurfaces provide unique solutions for advanced wavefront manipulation of light with complete control of amplitude and phase at sub-wavelength scales. One limitation, however, for most of these devices is the lack of any post-fabrication tunability of their response. To break this limit, a promising approach is employing phase-change materials (PCMs), which provide fast, low energy, and non-volatile means to endow metasurfaces with a switching mechanism. In this regard, great advancements have been done in the mid-infrared and near-infrared spectrum using different chalcogenides. In the visible spectral range, however, very few devices have demonstrated full phase manipulation, high efficiencies, and reversible optical modulation. In this work, a programmable all-dielectric Huygens' metasurface made of antimony sulfide (Sb2 S3 ) PCM is experimentally demonstrated, a low loss and high-index material in the visible spectral range with a large contrast (≈0.5) between its amorphous and crystalline states. ≈2π phase modulation is shown with high associated transmittance and it is used to create programmable beam-steering devices. These novel chalcogenide PCM metasurfaces have the potential to emerge as a platform for next-generation spatial light modulators and to impact application areas such as programmable and adaptive flat optics, light detection and ranging (LiDAR), and many more.
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Affiliation(s)
- Parikshit Moitra
- Institute of Materials Research and Engineering, A*STAR (Agency for Science, Technology and Research), Singapore, 138634, Singapore
| | - Yunzheng Wang
- Singapore University of Technology and Design, Singapore, 487372, Singapore
- Optics Research and Engineering, Shandong University, Qingdao, 266237, P. R. China
| | - Xinan Liang
- Institute of Materials Research and Engineering, A*STAR (Agency for Science, Technology and Research), Singapore, 138634, Singapore
| | - Li Lu
- Singapore University of Technology and Design, Singapore, 487372, Singapore
| | - Alyssa Poh
- Singapore University of Technology and Design, Singapore, 487372, Singapore
| | - Tobias W W Mass
- Institute of Materials Research and Engineering, A*STAR (Agency for Science, Technology and Research), Singapore, 138634, Singapore
| | - Robert E Simpson
- Singapore University of Technology and Design, Singapore, 487372, Singapore
| | - Arseniy I Kuznetsov
- Institute of Materials Research and Engineering, A*STAR (Agency for Science, Technology and Research), Singapore, 138634, Singapore
| | - Ramon Paniagua-Dominguez
- Institute of Materials Research and Engineering, A*STAR (Agency for Science, Technology and Research), Singapore, 138634, Singapore
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15
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Ma Y, Zhou H, Huang Y, Guo J, Zhu Y, Wu Z, Gu Q, Miao Z, Yan C, Wang S, Deng G, Zhou S. Electrically controllable optical switch metasurface based on vanadium dioxide. OPTICS LETTERS 2023; 48:3885-3888. [PMID: 37527074 DOI: 10.1364/ol.492350] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/03/2023] [Accepted: 06/22/2023] [Indexed: 08/03/2023]
Abstract
We report a voltage-tunable reflective gold wire grid metasurface on vanadium dioxide thin film, which consists of a metal-insulator-metal (MIM) structure. We excite surface plasmon polariton (SPP) modes on the gold surface by fabricating a one-dimensional structured gold wire grid. Joule heating of laser-induced graphene (LIG) can be controlled by the voltage at the bottom, allowing vanadium dioxide in the structure to complete the transition from the insulating state to the metallic state. The phase transition of vanadium dioxide strongly disrupts the plasmon modes excited by the gold wire grid above, thereby realizing a huge change in the reflection spectrum. This acts as a tunable metasurface optical switch with a maximum modulation depth (MD) of over 20 dB. We provide a more effective and simple method for creating tunable metasurfaces in the near-infrared band, which can allow metasurfaces to have wider applications in optical signal processing, optical storage, and holography.
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16
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Hu X, Lu C, Zhao X, Gu Y, Lu M, Sun D. A multi-parameter tunable plasmon modulator. Sci Rep 2023; 13:11483. [PMID: 37460748 DOI: 10.1038/s41598-023-38799-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2022] [Accepted: 07/14/2023] [Indexed: 07/20/2023] Open
Abstract
Multi-parameter control of light is a key functionality to modulate optical signals in photonic integrated circuits for various applications. However, the traditional optical modulators can only control one or two properties of light at the same time. Herein, we propose a hybrid structure which can modulate the amplitude, wavelength and phase of surface plasmon polaritons (SPPs) simultaneously to overcome these limitations. The numerical results show that when the Fermi level of graphene changes from 0.3 to 0.9 eV, the variation of optical transmission, wavelength and phase are 32.7 dB, 428 nm and 306°, respectively. The demonstrated structure triggers an approach for the realization of ultracompact modulation and has potential applications in the fields of optical switches, communications and photo-detection.
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Affiliation(s)
- Xuefang Hu
- College of Digital Technology and Engineering, Ningbo University of Finance & Economics, Ningbo, 315175, Zhejiang, China.
- Key Laboratory of Optical Information Detection and Display Technology of Zhejiang, Zhejiang Normal University, Jinhua, 321004, Zhejiang, China.
| | - Changgui Lu
- Advanced Photonics Center, School of Electronic Science and Engineering, Southeast University, Nanjing, 210096, Jiangsu, China
| | - Xiangyue Zhao
- Advanced Photonics Center, School of Electronic Science and Engineering, Southeast University, Nanjing, 210096, Jiangsu, China
| | - Yinwei Gu
- Advanced Photonics Center, School of Electronic Science and Engineering, Southeast University, Nanjing, 210096, Jiangsu, China
| | - Mengjia Lu
- Advanced Photonics Center, School of Electronic Science and Engineering, Southeast University, Nanjing, 210096, Jiangsu, China
| | - Dechao Sun
- College of Digital Technology and Engineering, Ningbo University of Finance & Economics, Ningbo, 315175, Zhejiang, China
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17
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Yang Y, Seong J, Choi M, Park J, Kim G, Kim H, Jeong J, Jung C, Kim J, Jeon G, Lee KI, Yoon DH, Rho J. Integrated metasurfaces for re-envisioning a near-future disruptive optical platform. LIGHT, SCIENCE & APPLICATIONS 2023; 12:152. [PMID: 37339970 DOI: 10.1038/s41377-023-01169-4] [Citation(s) in RCA: 10] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/21/2022] [Revised: 02/16/2023] [Accepted: 04/24/2023] [Indexed: 06/22/2023]
Abstract
Metasurfaces have been continuously garnering attention in both scientific and industrial fields, owing to their unprecedented wavefront manipulation capabilities using arranged subwavelength artificial structures. To date, research has mainly focused on the full control of electromagnetic characteristics, including polarization, phase, amplitude, and even frequencies. Consequently, versatile possibilities of electromagnetic wave control have been achieved, yielding practical optical components such as metalenses, beam-steerers, metaholograms, and sensors. Current research is now focused on integrating the aforementioned metasurfaces with other standard optical components (e.g., light-emitting diodes, charged-coupled devices, micro-electro-mechanical systems, liquid crystals, heaters, refractive optical elements, planar waveguides, optical fibers, etc.) for commercialization with miniaturization trends of optical devices. Herein, this review describes and classifies metasurface-integrated optical components, and subsequently discusses their promising applications with metasurface-integrated optical platforms including those of augmented/virtual reality, light detection and ranging, and sensors. In conclusion, this review presents several challenges and prospects that are prevalent in the field in order to accelerate the commercialization of metasurfaces-integrated optical platforms.
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Affiliation(s)
- Younghwan Yang
- Department of Mechanical Engineering, Pohang University of Science and Technology (POSTECH), Pohang, 37673, Republic of Korea
| | - Junhwa Seong
- Department of Mechanical Engineering, Pohang University of Science and Technology (POSTECH), Pohang, 37673, Republic of Korea
| | - Minseok Choi
- Department of Mechanical Engineering, Pohang University of Science and Technology (POSTECH), Pohang, 37673, Republic of Korea
| | - Junkyeong Park
- Department of Mechanical Engineering, Pohang University of Science and Technology (POSTECH), Pohang, 37673, Republic of Korea
| | - Gyeongtae Kim
- Department of Mechanical Engineering, Pohang University of Science and Technology (POSTECH), Pohang, 37673, Republic of Korea
| | - Hongyoon Kim
- Department of Mechanical Engineering, Pohang University of Science and Technology (POSTECH), Pohang, 37673, Republic of Korea
| | - Junhyeon Jeong
- Department of Mechanical Engineering, Pohang University of Science and Technology (POSTECH), Pohang, 37673, Republic of Korea
| | - Chunghwan Jung
- Department of Chemical Engineering, Pohang University of Science and Technology (POSTECH), Pohang, 37673, Republic of Korea
| | - Joohoon Kim
- Department of Mechanical Engineering, Pohang University of Science and Technology (POSTECH), Pohang, 37673, Republic of Korea
| | - Gyoseon Jeon
- Research Institute of Industrial Science and Technology (RIST), Pohang, 37673, Republic of Korea
| | - Kyung-Il Lee
- Research Institute of Industrial Science and Technology (RIST), Pohang, 37673, Republic of Korea
| | - Dong Hyun Yoon
- Research Institute of Industrial Science and Technology (RIST), Pohang, 37673, Republic of Korea
| | - Junsuk Rho
- Department of Mechanical Engineering, Pohang University of Science and Technology (POSTECH), Pohang, 37673, Republic of Korea.
- Department of Chemical Engineering, Pohang University of Science and Technology (POSTECH), Pohang, 37673, Republic of Korea.
- POSCO-POSTECH-RIST Convergence Research Center for Flat Optics and Metaphotonics, Pohang, 37673, Republic of Korea.
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18
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Chung H, Hwang I, Yu J, Boehm G, Belkin MA, Lee J. Electrical Phase Modulation Based on Mid-Infrared Intersubband Polaritonic Metasurfaces. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2023; 10:e2207520. [PMID: 37029461 DOI: 10.1002/advs.202207520] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/19/2022] [Revised: 02/24/2023] [Indexed: 06/04/2023]
Abstract
Electrically reconfigurable metasurfaces that overcome the static limitations in controlling the fundamental properties of scattered light are opening new avenues for functional flat optics. This work proposes and experimentally demonstrates electrically phase-tunable mid-infrared metasurfaces based on the polaritonic coupling of Stark-tunable intersubband transitions in semiconductor heterostructures and electromagnetic modes in plasmonic nanoresonators. In the applied voltage range of -3 to +3 V, the local phase tuning of the light reflects from the metasurface, which enables the electrical control of the polarization state and wavefront of the reflected wave. Electrical beam polarization control, electrical beam diffraction control, and electrical beam steering are experimentally demonstrated as applications for local phase tunability. The proposed electrically tunable metasurfaces can easily tune the operating wavelength and function at relatively low voltages, which will enable various applications in the mid-infrared region.
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Affiliation(s)
- Hyeongju Chung
- Department of Electrical Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan, 44919, Republic of Korea
| | - Inyong Hwang
- Department of Electrical Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan, 44919, Republic of Korea
| | - Jaeyeon Yu
- Department of Electrical Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan, 44919, Republic of Korea
| | - Gerhard Boehm
- Walter Schottky Institute, Technical University of Munich, 85748, Garching, Germany
| | - Mikhail A Belkin
- Walter Schottky Institute, Technical University of Munich, 85748, Garching, Germany
| | - Jongwon Lee
- Department of Electrical Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan, 44919, Republic of Korea
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19
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Li M, Hail CU, Biswas S, Atwater HA. Excitonic Beam Steering in an Active van der Waals Metasurface. NANO LETTERS 2023; 23:2771-2777. [PMID: 36921321 DOI: 10.1021/acs.nanolett.3c00032] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
Two-dimensional transition metal dichalcogenides (2D TMDCs) are promising candidates for ultrathin active nanophotonic elements due to the strong tunable excitonic resonances that dominate their optical response. Here, we demonstrate dynamic beam steering by an active van der Waals metasurface that leverages large complex refractive index tunability near excitonic resonances in monolayer molybdenum diselenide (MoSe2). Through varying the radiative and nonradiative rates of the excitons, we can dynamically control both the reflection amplitude and phase profiles, resulting in an excitonic phased array metasurface. Our experiments show reflected light steering to angles between -30° and 30° at different resonant wavelengths corresponding to the A exciton and B exciton. This active van der Waals metasurface relies solely on the excitonic resonances of the monolayer MoSe2 material rather than geometric resonances of patterned nanostructures, suggesting the potential to harness the tunability of excitonic resonances for wavefront shaping in emerging photonic applications.
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Affiliation(s)
- Melissa Li
- Thomas J. Watson Laboratory of Applied Physics, California Institute of Technology, Pasadena, California 91125, United States
| | - Claudio U Hail
- Thomas J. Watson Laboratory of Applied Physics, California Institute of Technology, Pasadena, California 91125, United States
| | - Souvik Biswas
- Thomas J. Watson Laboratory of Applied Physics, California Institute of Technology, Pasadena, California 91125, United States
| | - Harry A Atwater
- Thomas J. Watson Laboratory of Applied Physics, California Institute of Technology, Pasadena, California 91125, United States
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20
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Ma H, Yang J, Chen T, Duan J, Liu Y, Yang S, Liu L, Gong R, Deng L. Tunable metasurface for independent controlling radar stealth properties via geometric and propagation phase modulation. OPTICS EXPRESS 2023; 31:11760-11774. [PMID: 37155803 DOI: 10.1364/oe.485132] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/10/2023]
Abstract
Metasurfaces have been verified as an ideal way to control electromagnetic waves within an optically thin interface. In this paper, a design method of a tunable metasurface integrated with vanadium dioxide (VO2) is proposed to realize independent control of geometric and propagation phase modulation. The reversible conversion of VO2 between insulator phase and metal phase can be realized by controlling the ambient temperature, which enables the metasurface to be switched quickly between split-ring and double-ring structures. The phase characteristics of 2-bit coding units and the electromagnetic scattering characteristics of arrays composed of different arrangements are analyzed in detail, which confirms the independence of geometric and propagation phase modulation in the tunable metasurface. The experimental results demonstrate that the fabricated regular array and random array samples have different broadband low reflection frequency bands before and after the phase transition of VO2, and the 10 dB reflectivity reduction bands can be switched quickly between C/X and Ku bands, which are in good agreement with the numerical simulation. This method realizes the switching function of metasurface modulation mode by controlling the ambient temperature, which provides a flexible and feasible idea for the design and fabrication of stealth metasurfaces.
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21
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Zhang W, Wu X, Li L, Zou C, Chen Y. Fabrication of a VO 2-Based Tunable Metasurface by Electric-Field Scanning Probe Lithography with Precise Depth Control. ACS APPLIED MATERIALS & INTERFACES 2023; 15:13517-13525. [PMID: 36856296 DOI: 10.1021/acsami.2c21935] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
Vanadium dioxide (VO2) is widely employed in developing tunable optoelectronic devices due to its significant changes in optical and electric properties upon phase transition. To fabricate the VO2-based functional devices down to the micro/nanoscale, a high-resolution processing technique is in demand. Scanning probe lithography (SPL) on the basis of a tip-induced electric field provides a promising approach for prototyping. Here, we demonstrated a precise VO2 etching strategy by direct writing on a VO2 film with a negative tip bias and subsequent sonication removal of the written area. The effects of bias voltage, sonication, and thermal treatment as well as the mechanical difference between the tip-modulated area and the pristine VO2 film were investigated systematically. The results show that VO2 can be etched layer by layer via alternately repeating tip modulation and sonication, and arbitrary patterns can be written. Based on this route, we designed a kind of metasurface by arranging VO2-gold nanoblocks with different sizes and heights for spectrally selective tunable reflectivity in near- and mid-infrared. This electric-field SPL method demonstrates the prominent advantages of high resolution down to several tens of nanometers, quasi-3D patterning, and resist-free maskless direct writing, which should be applicable for prototyping other micro/nanodevices.
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Affiliation(s)
- Wenhao Zhang
- Department of Precision Machinery and Precision Instrumentation, University of Science and Technology of China, Hefei 230027, China
- Key Laboratory of Precision Scientific Instrumentation of Anhui Higher Education Institutes, University of Science and Technology of China, Hefei 230027, China
| | - Xiqi Wu
- Department of Precision Machinery and Precision Instrumentation, University of Science and Technology of China, Hefei 230027, China
- Key Laboratory of Precision Scientific Instrumentation of Anhui Higher Education Institutes, University of Science and Technology of China, Hefei 230027, China
| | - Liang Li
- National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei 230029, China
| | - Chongwen Zou
- National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei 230029, China
| | - Yuhang Chen
- Department of Precision Machinery and Precision Instrumentation, University of Science and Technology of China, Hefei 230027, China
- Key Laboratory of Precision Scientific Instrumentation of Anhui Higher Education Institutes, University of Science and Technology of China, Hefei 230027, China
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22
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Chong MZ, He Y, Zhao J, Zhang YY, Zhang ZK, Zhang CQ, Du CH, Zang X, Liu PK. Spin-decoupled excitation and wavefront shaping of structured surface waves via on-chip terahertz metasurfaces. NANOSCALE 2023; 15:4515-4522. [PMID: 36757161 DOI: 10.1039/d2nr06983k] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
Surface waves (SWs) are of great importance in terahertz (THz) photonics applications due to their subwavelength properties. Hence, it is crucial to develop surface wavefront shaping techniques, which is urgent in modern information technologies. In this paper, a new scheme is proposed to realize SW excitation and spin-decoupled wavefront shaping with an ultracompact planar meta-device working in the THz range. The meta-device is composed of two parts: meta-atoms (in the center) and plasmonic metals (on the left and right sides). By carefully setting the geometry size and rotation angle of each meta-atom, the encoded spin-decoupled phase distributions for both left circularly polarized (LCP) and right circularly polarized (RCP) incident THz waves are determined. In this way, circularly polarized (CP) incident THz waves can be converted to SWs propagating along plasmonic metals with unique wavefront profiles, i.e., Bessel and focusing profiles. Full-wave simulations and THz near-field scanning experiments were performed to verify the functionalities of the meta-device, both of which are in great agreement with theoretical predictions. Our findings may provide more solutions to design THz integrated photonic devices and systems.
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Affiliation(s)
- Ming-Zhe Chong
- State Key Laboratory of Advanced Optical Communication Systems and Networks, School of Electronics, Peking University, Beijing, 100871, China.
| | - Yidan He
- Key Laboratory for the Physics and Chemistry of Nanodevices, School of Electronics, Peking University, Beijing, 100871, China
| | - Jin Zhao
- State Key Laboratory of Advanced Optical Communication Systems and Networks, School of Electronics, Peking University, Beijing, 100871, China.
| | - Yue-Yi Zhang
- State Key Laboratory of Advanced Optical Communication Systems and Networks, School of Electronics, Peking University, Beijing, 100871, China.
| | - Zong-Kun Zhang
- State Key Laboratory of Advanced Optical Communication Systems and Networks, School of Electronics, Peking University, Beijing, 100871, China.
| | - Chong-Qi Zhang
- State Key Laboratory of Advanced Optical Communication Systems and Networks, School of Electronics, Peking University, Beijing, 100871, China.
| | - Chao-Hai Du
- State Key Laboratory of Advanced Optical Communication Systems and Networks, School of Electronics, Peking University, Beijing, 100871, China.
| | - Xiaofei Zang
- Terahertz Technology Innovation Research Institute, and Shanghai Key Lab of Modern Optical System, University of Shanghai for Science and Technology, No. 516 JunGong Road, Shanghai, 200093, China.
| | - Pu-Kun Liu
- State Key Laboratory of Advanced Optical Communication Systems and Networks, School of Electronics, Peking University, Beijing, 100871, China.
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23
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Zangeneh Kamali K, Xu L, Gagrani N, Tan HH, Jagadish C, Miroshnichenko A, Neshev D, Rahmani M. Electrically programmable solid-state metasurfaces via flash localised heating. LIGHT, SCIENCE & APPLICATIONS 2023; 12:40. [PMID: 36810847 PMCID: PMC9944259 DOI: 10.1038/s41377-023-01078-6] [Citation(s) in RCA: 9] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/06/2022] [Revised: 01/10/2023] [Accepted: 01/13/2023] [Indexed: 05/29/2023]
Abstract
In the last decades, metasurfaces have attracted much attention because of their extraordinary light-scattering properties. However, their inherently static geometry is an obstacle to many applications where dynamic tunability in their optical behaviour is required. Currently, there is a quest to enable dynamic tuning of metasurface properties, particularly with fast tuning rate, large modulation by small electrical signals, solid state and programmable across multiple pixels. Here, we demonstrate electrically tunable metasurfaces driven by thermo-optic effect and flash-heating in silicon. We show a 9-fold change in transmission by <5 V biasing voltage and the modulation rise-time of <625 µs. Our device consists of a silicon hole array metasurface encapsulated by transparent conducting oxide as a localised heater. It allows for video frame rate optical switching over multiple pixels that can be electrically programmed. Some of the advantages of the proposed tuning method compared with other methods are the possibility to apply it for modulation in the visible and near-infrared region, large modulation depth, working at transmission regime, exhibiting low optical loss, low input voltage requirement, and operating with higher than video-rate switching speed. The device is furthermore compatible with modern electronic display technologies and could be ideal for personal electronic devices such as flat displays, virtual reality holography and light detection and ranging, where fast, solid-state and transparent optical switches are required.
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Affiliation(s)
- Khosro Zangeneh Kamali
- ARC Centre of Excellence for Transformative Meta-Optical Systems (TMOS), Research School of Physics, The Australian National University, Canberra, ACT 2601, Australia
| | - Lei Xu
- Advanced Optics and Photonics Laboratory, Department of Engineering, School of Science and Technology, Nottingham Trent University, Nottingham, NG11 8NS, UK
| | - Nikita Gagrani
- ARC Centre of Excellence for Transformative Meta-Optical Systems (TMOS), Research School of Physics, The Australian National University, Canberra, ACT 2601, Australia
| | - Hark Hoe Tan
- ARC Centre of Excellence for Transformative Meta-Optical Systems (TMOS), Research School of Physics, The Australian National University, Canberra, ACT 2601, Australia
| | - Chennupati Jagadish
- ARC Centre of Excellence for Transformative Meta-Optical Systems (TMOS), Research School of Physics, The Australian National University, Canberra, ACT 2601, Australia
| | - Andrey Miroshnichenko
- School of Engineering and Information Technology, University of New South Wales, Canberra, ACT 2600, Australia
| | - Dragomir Neshev
- ARC Centre of Excellence for Transformative Meta-Optical Systems (TMOS), Research School of Physics, The Australian National University, Canberra, ACT 2601, Australia.
| | - Mohsen Rahmani
- Advanced Optics and Photonics Laboratory, Department of Engineering, School of Science and Technology, Nottingham Trent University, Nottingham, NG11 8NS, UK.
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24
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Xu X, Lou J, Gao M, Wu S, Fang G, Huang Y. Ultrafast Modulation of THz Waves Based on MoTe 2-Covered Metasurface. SENSORS (BASEL, SWITZERLAND) 2023; 23:1174. [PMID: 36772214 PMCID: PMC9921109 DOI: 10.3390/s23031174] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/20/2022] [Revised: 01/14/2023] [Accepted: 01/17/2023] [Indexed: 06/18/2023]
Abstract
The sixth generation (6G) communication will use the terahertz (THz) frequency band, which requires flexible regulation of THz waves. For the conventional metallic metasurface, its electromagnetic properties are hard to be changed once after being fabricated. To enrich the modulation of THz waves, we report an all-optically controlled reconfigurable electromagnetically induced transparency (EIT) effect in the hybrid metasurface integrated with a 10-nm thick MoTe2 film. The experimental results demonstrate that under the excitation of the 800 nm femtosecond laser pulse with pump fluence of 3200 μJ/cm2, the modulation depth of THz transmission amplitude at the EIT window can reach 77%. Moreover, a group delay variation up to 4.6 ps is observed to indicate an actively tunable slow light behavior. The suppression and recovery of the EIT resonance can be accomplished within sub-nanoseconds, enabling an ultrafast THz photo-switching and providing a promising candidate for the on-chip devices of the upcoming 6G communication.
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Affiliation(s)
- Xing Xu
- Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100094, China
- Innovation Laboratory of Terahertz Biophysics, National Innovation Institute of Defense Technology, Beijing 100071, China
- Key Laboratory of Electromagnetic Radiation and Sensing Technology, Chinese Academy of Sciences, Beijing 100190, China
- School of Electronic, Electrical and Communication Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Jing Lou
- Innovation Laboratory of Terahertz Biophysics, National Innovation Institute of Defense Technology, Beijing 100071, China
| | - Mingxin Gao
- Innovation Laboratory of Terahertz Biophysics, National Innovation Institute of Defense Technology, Beijing 100071, China
| | - Shiyou Wu
- Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100094, China
- Key Laboratory of Electromagnetic Radiation and Sensing Technology, Chinese Academy of Sciences, Beijing 100190, China
- School of Electronic, Electrical and Communication Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Guangyou Fang
- Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100094, China
- Key Laboratory of Electromagnetic Radiation and Sensing Technology, Chinese Academy of Sciences, Beijing 100190, China
- School of Electronic, Electrical and Communication Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Yindong Huang
- Innovation Laboratory of Terahertz Biophysics, National Innovation Institute of Defense Technology, Beijing 100071, China
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25
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Li J, Liu Y, Chen Y, Chen W, Guo H, Wu Q, Li M. Tunable Broadband-Narrowband and Dual-Broadband Terahertz Absorber Based on a Hybrid Metamaterial Vanadium Dioxide and Graphene. MICROMACHINES 2023; 14:201. [PMID: 36677262 PMCID: PMC9867335 DOI: 10.3390/mi14010201] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/12/2022] [Revised: 01/05/2023] [Accepted: 01/11/2023] [Indexed: 06/17/2023]
Abstract
We propose a functionally tunable terahertz (THz) metamaterial absorber, which has the switching performance between broadband-narrowband and dual-broadband near-perfect absorption due to the phase transition of Vanadium dioxide (VO2) and the tunable electrical property of graphene. The switching absorption properties are verified by computer simulation technology (CST) microwave study. The simulation results show that when VO2 is in the metallic phase, over 90% broadband absorption is realized in the 3.85-6.32 THz range. When the VO2 is in the insulating phase, the absorber shows quadruple narrowband absorption. By changing the Fermi level of graphene and the conductivity of VO2, the low-frequency broadband of 3.85-6.32 THz can be switched to the high-frequency broadband of 6.92-8.92 THz, and the absorber can be switched from a quadruple narrowband to a nearly singlefold narrowband. In addition, the proposed absorber is insensitive to polarization due to its symmetry and wide incident angle. The design may have potential applications in the THz range, such as switches, electromagnetic shielding, cloaking objects, filtering, sensing, and so on.
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Affiliation(s)
- Jing Li
- School of Instrument and Electronics, North University of China, Taiyuan 030051, China
- School of Instrument and Intelligent Future Technology, North University of China, Taiyuan 030051, China
- Academy for Advanced Interdisciplinary Research, North University of China, Taiyuan 030051, China
- Center for Microsystem Intergration, North University of China, Taiyuan 030051, China
| | - Yanfei Liu
- School of Instrument and Intelligent Future Technology, North University of China, Taiyuan 030051, China
- Academy for Advanced Interdisciplinary Research, North University of China, Taiyuan 030051, China
- Center for Microsystem Intergration, North University of China, Taiyuan 030051, China
- School of Semiconductors and Physics, North University of China, Taiyuan 030051, China
| | - Yu Chen
- School of Instrument and Electronics, North University of China, Taiyuan 030051, China
- School of Instrument and Intelligent Future Technology, North University of China, Taiyuan 030051, China
- Academy for Advanced Interdisciplinary Research, North University of China, Taiyuan 030051, China
- Center for Microsystem Intergration, North University of China, Taiyuan 030051, China
| | - Wenqing Chen
- School of Instrument and Electronics, North University of China, Taiyuan 030051, China
- School of Instrument and Intelligent Future Technology, North University of China, Taiyuan 030051, China
- Academy for Advanced Interdisciplinary Research, North University of China, Taiyuan 030051, China
- Center for Microsystem Intergration, North University of China, Taiyuan 030051, China
| | - Honglei Guo
- School of Instrument and Electronics, North University of China, Taiyuan 030051, China
- School of Instrument and Intelligent Future Technology, North University of China, Taiyuan 030051, China
- Academy for Advanced Interdisciplinary Research, North University of China, Taiyuan 030051, China
- Center for Microsystem Intergration, North University of China, Taiyuan 030051, China
| | - Qiannan Wu
- School of Instrument and Intelligent Future Technology, North University of China, Taiyuan 030051, China
- Academy for Advanced Interdisciplinary Research, North University of China, Taiyuan 030051, China
- Center for Microsystem Intergration, North University of China, Taiyuan 030051, China
- School of Semiconductors and Physics, North University of China, Taiyuan 030051, China
| | - Mengwei Li
- School of Instrument and Electronics, North University of China, Taiyuan 030051, China
- School of Instrument and Intelligent Future Technology, North University of China, Taiyuan 030051, China
- Academy for Advanced Interdisciplinary Research, North University of China, Taiyuan 030051, China
- Center for Microsystem Intergration, North University of China, Taiyuan 030051, China
- Key Laboratory of Dynamic Measurement Technology, North University of China, Taiyuan 030051, China
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26
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Du B, Xu Y, Ding H, Jiang W, Zhang L, Zhang Y. Tunable Light Field Modulations with Chip- and Fiber-Compatible Monolithic Dielectric Metasurfaces. NANOMATERIALS (BASEL, SWITZERLAND) 2022; 13:69. [PMID: 36615979 PMCID: PMC9823379 DOI: 10.3390/nano13010069] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/17/2022] [Revised: 12/19/2022] [Accepted: 12/20/2022] [Indexed: 06/17/2023]
Abstract
Metasurfaces with a high engineering degree of freedom are promising building blocks for applications in metalenses, beam deflectors, metaholograms, sensing, and many others. Though the fundamental and technological challenges, proposing tunable metasurfaces is still possible. Previous efforts in this field are mainly taken on designing sophisticated structures with active materials introduced. Here, we present a generic kind of monolithic dielectric metasurfaces for tunable light field modulations. Changes in the period number and surrounding refractive index enable discrete and continuous modulations of spatial light fields, respectively. We exemplify this concept in monolithic Lithium Niobate metasurfaces for tunable metalenses and beam deflectors. The utilization of monolithic dielectric materials facilitates the ready integration of the metasurfaces with both chip and optical fiber platforms. This concept is not limited by the availability of active materials or expensive and time-consuming fabrication techniques, which can be applied to any transparent dielectric materials and various optical platforms.
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Affiliation(s)
- Bobo Du
- Key Laboratory of Physical Electronics and Devices of Ministry of Education and Shaanxi Key Laboratory of Information Photonic Technique, School of Electronic Science and Engineering, Xi’an Jiaotong University, Xi’an 710049, China
| | - Yunfan Xu
- Key Laboratory of Physical Electronics and Devices of Ministry of Education and Shaanxi Key Laboratory of Information Photonic Technique, School of Electronic Science and Engineering, Xi’an Jiaotong University, Xi’an 710049, China
| | - Huimin Ding
- Key Laboratory of Physical Electronics and Devices of Ministry of Education and Shaanxi Key Laboratory of Information Photonic Technique, School of Electronic Science and Engineering, Xi’an Jiaotong University, Xi’an 710049, China
| | - Weitao Jiang
- State Key Laboratory for Manufacturing Systems Engineering, Xi’an Jiaotong University, Xi’an 710049, China
| | - Lei Zhang
- Key Laboratory of Physical Electronics and Devices of Ministry of Education and Shaanxi Key Laboratory of Information Photonic Technique, School of Electronic Science and Engineering, Xi’an Jiaotong University, Xi’an 710049, China
| | - Yanpeng Zhang
- Key Laboratory of Physical Electronics and Devices of Ministry of Education and Shaanxi Key Laboratory of Information Photonic Technique, School of Electronic Science and Engineering, Xi’an Jiaotong University, Xi’an 710049, China
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27
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Zhang J, Li Q, Dai C, Cheng M, Hu X, Kim HS, Yang H, Preston DJ, Li Z, Zhang X, Lee WK. Hydrogel-Based, Dynamically Tunable Plasmonic Metasurfaces with Nanoscale Resolution. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2022; 18:e2205057. [PMID: 36269881 DOI: 10.1002/smll.202205057] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/19/2022] [Revised: 10/02/2022] [Indexed: 06/16/2023]
Abstract
Flat metasurfaces with subwavelength meta-atoms can be designed to manipulate the electromagnetic parameters of incident light and enable unusual light-matter interactions. Although hydrogel-based metasurfaces have the potential to control optical properties dynamically in response to environmental conditions, the pattern resolution of these surfaces has been limited to microscale features or larger, limiting capabilities at the nanoscale, and precluding effective use in metamaterials. This paper reports a general approach to developing tunable plasmonic metasurfaces with hydrogel meta-atoms at the subwavelength scale. Periodic arrays of hydrogel nanodots with continuously tunable diameters are fabricated on silver substrates, resulting in humidity-responsive surface plasmon polaritons (SPPs) at the nanostructure-metal interfaces. The peaks of the SPPs are controlled reversibly by absorbing or releasing water within the hydrogel matrix, the matrix-generated plasmonic color rendering in the visible spectrum. This work demonstrates that metasurfaces designed with these spatially patterned nanodots of varying sizes benefit applications in anti-counterfeiting and generate multicolored displays with single-nanodot resolution. Furthermore, this work shows system versatility exhibited by broadband beam-steering on a phase modulator consisting of hydrogel supercell units in which the size variations of constituent hydrogel nanostructures engineer the wavefront of reflected light from the metasurface.
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Affiliation(s)
- Jian Zhang
- Information Research Center for EM Metamaterials and Institute of Advanced Magnetic Materials, College of Materials and Environmental Engineering, Hangzhou Dianzi University, Hangzhou, 310018, China
| | - Qiang Li
- State Key Laboratory of Modern Optical Instrumentation, College of Optical Science and Engineering, Zhejiang University, Hangzhou, 310027, China
| | - Chenjie Dai
- Electronic Information School, Wuhan University, Wuhan, 430072, China
| | - Mingliang Cheng
- Information Research Center for EM Metamaterials and Institute of Advanced Magnetic Materials, College of Materials and Environmental Engineering, Hangzhou Dianzi University, Hangzhou, 310018, China
| | - Xin Hu
- Information Research Center for EM Metamaterials and Institute of Advanced Magnetic Materials, College of Materials and Environmental Engineering, Hangzhou Dianzi University, Hangzhou, 310018, China
| | - Hyun-Sik Kim
- Department of Materials Science and Engineering, University of Seoul, Seoul, 02504, Korea
| | - Heesun Yang
- Department of Materials Science and Engineering, Hongik University, Seoul, 04066, Korea
| | - Daniel J Preston
- Department of Mechanical Engineering, Rice University, Houston, TX, 77006, USA
| | - Zhongyang Li
- Electronic Information School, Wuhan University, Wuhan, 430072, China
| | - Xuefeng Zhang
- Information Research Center for EM Metamaterials and Institute of Advanced Magnetic Materials, College of Materials and Environmental Engineering, Hangzhou Dianzi University, Hangzhou, 310018, China
| | - Won-Kyu Lee
- Department of Materials Science and Engineering, Hongik University, Seoul, 04066, Korea
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28
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Electro-active metaobjective from metalenses-on-demand. Nat Commun 2022; 13:7183. [PMID: 36418295 PMCID: PMC9684136 DOI: 10.1038/s41467-022-34494-0] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2022] [Accepted: 10/20/2022] [Indexed: 11/26/2022] Open
Abstract
Switchable metasurfaces can actively control the functionality of integrated metadevices with high efficiency and on ultra-small length scales. Such metadevices include active lenses, dynamic diffractive optical elements, or switchable holograms. Especially, for applications in emerging technologies such as AR (augmented reality) and VR (virtual reality) devices, sophisticated metaoptics with unique functionalities are crucially important. In particular, metaoptics which can be switched electrically on or off will allow to change the routing, focusing, or functionality in general of miniaturized optical components on demand. Here, we demonstrate metalenses-on-demand made from metallic polymer plasmonic nanoantennas which are electrically switchable at CMOS (complementary metal-oxide-semiconductor) compatible voltages of ±1 V. The nanoantennas exhibit plasmonic resonances which can be reversibly switched ON and OFF via the applied voltage, utilizing the optical metal-to-insulator transition of the metallic polymer. Ultimately, we realize an electro-active non-volatile multi-functional metaobjective composed of two metalenses, whose unique optical states can be set on demand. Overall, our work opens up the possibility for a new level of electro-optical elements for ultra-compact photonic integration.
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29
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Ju Y, Zhou H, Zhao Y, Wang F, Yang Z, Deng X, Wu Z, Guoliang D, Zuo H. Hybrid resonance metasurface for a lithium niobate electro-optical modulator. OPTICS LETTERS 2022; 47:5905-5908. [PMID: 37219133 DOI: 10.1364/ol.474784] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/06/2022] [Accepted: 10/15/2022] [Indexed: 05/24/2023]
Abstract
Electrically tunable metasurfaces can realize two-dimensional pixelated spatial light modulation and have a wide range of applications in optical switching, free-space communication, high-speed imaging, and so on, arousing the interest of researchers. Here, a gold nanodisk metasurface on a lithium-niobate-on-insulator (LNOI) substrate is fabricated and experimentally demonstrated as an electrically tunable optical metasurface for transmissive free-space light modulation. Using the hybrid resonance formed by the localized surface plasmon resonance (LSPR) of gold nanodisks and the Fabry-Perot (FP) resonance, the incident light is trapped in the gold nanodisk edges and a thin lithium niobate layer to realize field enhancement. In this way, an extinction ratio of 40% is achieved at the resonance wavelength. In addition, the proportion of hybrid resonance components can be adjusted by the size of the gold nanodisks. By applying a driving voltage of ± 2.8 V, a dynamic modulation of 135 MHz is achieved at resonant wavelength. The highest signal-to-noise ratio (SNR) is up to 48 dB at 75 MHz. This work paves the way for the realization of spatial light modulators based on CMOS-compatible LiNbO3 planar optics, which can be used in lidar, tunable displays, and so on.
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30
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Zeng D, Zong S, Liu G, Yuan W, Liu X, Liu Z. Dynamically electrical/thermal-tunable perfect absorber for a high-performance terahertz modulation. OPTICS EXPRESS 2022; 30:39736-39746. [PMID: 36298919 DOI: 10.1364/oe.474970] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/07/2022] [Accepted: 09/28/2022] [Indexed: 06/16/2023]
Abstract
We present a high-performance functional perfect absorber in a wide range of terahertz (THz) wave based on a hybrid structure of graphene and vanadium dioxide (VO2) resonators. Dynamically electrical and thermal tunable absorption is achieved due to the management on the resonant properties via the external surroundings. Multifunctional manipulations can be further realized within such absorber platform. For instance, a wide-frequency terahertz perfect absorber with the operation frequency range covering from 1.594 THz to 3.272 THz can be realized when the conductivity of VO2 is set to 100000 S/m (metal phase) and the Fermi level of graphene is 0.01 eV. The absorption can be dynamically changed from 0 to 99.98% and in verse by adjusting the conductivity of VO2. The impedance matching theory is introduced to analyze and elucidate the wideband absorption rate. In addition, the absorber can be changed from wideband absorption to dual-band absorption by adjusting the Fermi level of graphene from 0.01 eV to 0.7 eV when the conductivity of VO2 is fixed at 100000 S/m. Besides, the analysis of the chiral characteristics of the helical structure shows that the extinction cross-section has a circular dichroic response under the excitation of two different circularly polarized lights (CPL). Our study proposes approaches to manipulate the wide-band terahertz wave with multiple ways, paving the way for the development of technologies in the fields of switches, modulators, and imaging devices.
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31
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Chen B, Wang X, Li W, Li C, Wang Z, Guo H, Wu J, Fan K, Zhang C, He Y, Jin B, Chen J, Wu P. Electrically addressable integrated intelligent terahertz metasurface. SCIENCE ADVANCES 2022; 8:eadd1296. [PMID: 36223473 PMCID: PMC9555782 DOI: 10.1126/sciadv.add1296] [Citation(s) in RCA: 13] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/23/2022] [Accepted: 08/25/2022] [Indexed: 05/25/2023]
Abstract
Reconfigurable intelligent surfaces (RISs) play an essential role in various applications, such as next-generation communication, uncrewed vehicles, and vital sign recognizers. However, in the terahertz (THz) region, the development of RISs is limited because of lacking tunable phase shifters and low-cost sensors. Here, we developed an integrated self-adaptive metasurface (SAM) with THz wave detection and modulation capabilities based on the phase change material. By applying various coding sequences, the metasurface could deflect THz beams over an angle range of 42.8°. We established a software-defined sensing reaction system for intelligent THz wave manipulation. In the system, the SAM self-adaptively adjusted the THz beam deflection angle and stabilized the reflected power in response to the detected signal without human intervention, showing vast potential in eliminating coverage dead zones and other applications in THz communication. Our programmable controlled SAM creates a platform for intelligent electromagnetic information processing in the THz regime.
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Affiliation(s)
- Benwen Chen
- Research Institute of Superconductor Electronics (RISE), School of Electronic Science and Engineering, Nanjing University, Nanjing 210023, China
| | - Xinru Wang
- Ministry-of-Education Key Laboratory for the Green Preparation and Application of Functional Materials, Hubei Key Laboratory of Polymer Materials, School of Materials Science and Engineering, Hubei University, Wuhan 430062, China
| | - Weili Li
- Research Institute of Superconductor Electronics (RISE), School of Electronic Science and Engineering, Nanjing University, Nanjing 210023, China
| | - Chun Li
- Research Institute of Superconductor Electronics (RISE), School of Electronic Science and Engineering, Nanjing University, Nanjing 210023, China
| | - Zhaosong Wang
- Research Institute of Superconductor Electronics (RISE), School of Electronic Science and Engineering, Nanjing University, Nanjing 210023, China
| | - Hangbin Guo
- Research Institute of Superconductor Electronics (RISE), School of Electronic Science and Engineering, Nanjing University, Nanjing 210023, China
| | - Jingbo Wu
- Research Institute of Superconductor Electronics (RISE), School of Electronic Science and Engineering, Nanjing University, Nanjing 210023, China
- Purple Mountain Laboratories, Nanjing 211111, China
| | - Kebin Fan
- Research Institute of Superconductor Electronics (RISE), School of Electronic Science and Engineering, Nanjing University, Nanjing 210023, China
- Purple Mountain Laboratories, Nanjing 211111, China
| | - Caihong Zhang
- Research Institute of Superconductor Electronics (RISE), School of Electronic Science and Engineering, Nanjing University, Nanjing 210023, China
- Purple Mountain Laboratories, Nanjing 211111, China
| | - Yunbin He
- Ministry-of-Education Key Laboratory for the Green Preparation and Application of Functional Materials, Hubei Key Laboratory of Polymer Materials, School of Materials Science and Engineering, Hubei University, Wuhan 430062, China
| | - Biaobing Jin
- Research Institute of Superconductor Electronics (RISE), School of Electronic Science and Engineering, Nanjing University, Nanjing 210023, China
- Purple Mountain Laboratories, Nanjing 211111, China
| | - Jian Chen
- Research Institute of Superconductor Electronics (RISE), School of Electronic Science and Engineering, Nanjing University, Nanjing 210023, China
- Purple Mountain Laboratories, Nanjing 211111, China
| | - Peiheng Wu
- Research Institute of Superconductor Electronics (RISE), School of Electronic Science and Engineering, Nanjing University, Nanjing 210023, China
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32
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Nano-electromechanical spatial light modulator enabled by asymmetric resonant dielectric metasurfaces. Nat Commun 2022; 13:5811. [PMID: 36192401 PMCID: PMC9530114 DOI: 10.1038/s41467-022-33449-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2022] [Accepted: 09/20/2022] [Indexed: 11/17/2022] Open
Abstract
Spatial light modulators (SLMs) play essential roles in various free-space optical technologies, offering spatio-temporal control of amplitude, phase, or polarization of light. Beyond conventional SLMs based on liquid crystals or microelectromechanical systems, active metasurfaces are considered as promising SLM platforms because they could simultaneously provide high-speed and small pixel size. However, the active metasurfaces reported so far have achieved either limited phase modulation or low efficiency. Here, we propose nano-electromechanically tunable asymmetric dielectric metasurfaces as a platform for reflective SLMs. Exploiting the strong asymmetric radiation of perturbed high-order Mie resonances, the metasurfaces experimentally achieve a phase-shift close to 290∘, over 50% reflectivity, and a wavelength-scale pixel size. Electrical control of diffraction patterns is also achieved by displacing the Mie resonators using nano-electro-mechanical forces. This work paves the ways for future exploration of the asymmetric metasurfaces and for their application to the next-generation SLMs. This work experimentally demonstrates nano-electromechanically tunable asymmetric dielectric metasurfaces. The metasurfaces enable large phase tuning, high reflection, a wavelength-scale pixel size, and electrical control of diffraction patterns.
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33
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Abdelraouf OAM, Wang Z, Liu H, Dong Z, Wang Q, Ye M, Wang XR, Wang QJ, Liu H. Recent Advances in Tunable Metasurfaces: Materials, Design, and Applications. ACS NANO 2022; 16:13339-13369. [PMID: 35976219 DOI: 10.1021/acsnano.2c04628] [Citation(s) in RCA: 21] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Metasurfaces, a two-dimensional (2D) form of metamaterials constituted by planar meta-atoms, exhibit exotic abilities to tailor electromagnetic (EM) waves freely. Over the past decade, tremendous efforts have been made to develop various active materials and incorporate them into functional devices for practical applications, pushing the research of tunable metasurfaces to the forefront of nanophotonics. Those active materials include phase change materials (PCMs), semiconductors, transparent conducting oxides (TCOs), ferroelectrics, liquid crystals (LCs), atomically thin material, etc., and enable intriguing performances such as fast switching speed, large modulation depth, ultracompactness, and significant contrast of optical properties under external stimuli. Integration of such materials offers substantial tunability to the conventional passive nanophotonic platforms. Tunable metasurfaces with multifunctionalities triggered by various external stimuli bring in rich degrees of freedom in terms of material choices and device designs to dynamically manipulate and control EM waves on demand. This field has recently flourished with the burgeoning development of physics and design methodologies, particularly those assisted by the emerging machine learning (ML) algorithms. This review outlines recent advances in tunable metasurfaces in terms of the active materials and tuning mechanisms, design methodologies, and practical applications. We conclude this review paper by providing future perspectives in this vibrant and fast-growing research field.
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Affiliation(s)
- Omar A M Abdelraouf
- School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371, Singapore
- Institute of Materials Research and Engineering, Agency for Science, Technology and Research (A*STAR), 2 Fusionopolis Way, Singapore 138634, Singapore
| | - Ziyu Wang
- Institute of Materials Research and Engineering, Agency for Science, Technology and Research (A*STAR), 2 Fusionopolis Way, Singapore 138634, Singapore
| | - Hailong Liu
- Institute of Materials Research and Engineering, Agency for Science, Technology and Research (A*STAR), 2 Fusionopolis Way, Singapore 138634, Singapore
| | - Zhaogang Dong
- Institute of Materials Research and Engineering, Agency for Science, Technology and Research (A*STAR), 2 Fusionopolis Way, Singapore 138634, Singapore
| | - Qian Wang
- Institute of Materials Research and Engineering, Agency for Science, Technology and Research (A*STAR), 2 Fusionopolis Way, Singapore 138634, Singapore
| | - Ming Ye
- School of Electrical and Electronic Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore
| | - Xiao Renshaw Wang
- School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371, Singapore
- School of Electrical and Electronic Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore
| | - Qi Jie Wang
- School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371, Singapore
- School of Electrical and Electronic Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore
| | - Hong Liu
- Institute of Materials Research and Engineering, Agency for Science, Technology and Research (A*STAR), 2 Fusionopolis Way, Singapore 138634, Singapore
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Proffit M, Pelivani S, Landais P, Bradley AL. Electrically Driven Reprogrammable Vanadium Dioxide Metasurface Using Binary Control for Broadband Beam Steering. ACS APPLIED MATERIALS & INTERFACES 2022; 14:41186-41195. [PMID: 36049164 PMCID: PMC9478939 DOI: 10.1021/acsami.2c10194] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/08/2022] [Accepted: 08/23/2022] [Indexed: 06/15/2023]
Abstract
Resonant optical phased arrays are a promising way to reach fully reconfigurable metasurfaces in the optical and near-infrared (NIR) regimes with low energy consumption, low footprint, and high reliability. Continuously tunable resonant structures suffer from inherent drawbacks such as low phase range, amplitude-phase correlation, or extreme sensitivity that makes precise control at the individual element level very challenging. We computationally investigate 1-bit (binary) control as a mechanism to bypass these issues. We consider a metasurface for beam steering using a nanoresonator antenna and explore the theoretical capabilities of such phased arrays. A thermally realistic structure based on vanadium dioxide sandwiched in a metal-insulator-metal structure is proposed and optimized using inverse design to enhance its performance at 1550 nm. Continuous beam steering over 90° range is successfully achieved using binary control, with excellent agreement with predictions based on the theoretical first-principles description of phased arrays. Furthermore, a broadband response from 1500 to 1700 nm is achieved. The robustness to the design manufacturing imperfections is also demonstrated. This simplified approach can be implemented to optimize tunable nanophotonic phased array metasurfaces based on other materials or phased shifting mechanisms for various functionalities.
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Affiliation(s)
- Matthieu Proffit
- School
of Physics and AMBER, Trinity College Dublin, Dublin 2, Ireland
| | - Sara Pelivani
- School
of Physics and AMBER, Trinity College Dublin, Dublin 2, Ireland
| | - Pascal Landais
- School
of Electronic Engineering, Dublin City University, Glasnevin, Dublin 9, Ireland
| | - A. Louise Bradley
- School
of Physics and AMBER, Trinity College Dublin, Dublin 2, Ireland
- IPIC,
Tyndall National Institute, Cork T12R5CP, Ireland
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35
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Sabri R, Mosallaei H. Inverse design of perimeter-controlled InAs-assisted metasurface for two-dimensional dynamic beam steering. NANOPHOTONICS 2022; 11:4515-4530. [PMID: 36213387 PMCID: PMC9507428 DOI: 10.1515/nanoph-2022-0376] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/29/2022] [Accepted: 09/02/2022] [Indexed: 06/16/2023]
Abstract
The current commercially viable light detection and ranging systems demand continuous, full-scene, and dynamic two-dimensional point scanning, while featuring large aperture size to ensure long distance operation. However, the biasing architecture of large-area arrays with numerous individually controlled tunable elements is substantially complicated. Herein, inverse design of a perimeter-controlled active metasurface for two-dimensional dynamic beam steering at mid-infrared regime is theoretically presented. The perimeter-control approach simplifies biasing architecture by allowing column-row addressing of the elements. The metasurface consists of a periodic array of plasmonic patch nanoantennas in a metal-insulator-metal configuration, wherein two active layers of indium arsenide are incorporated into its building block. The metasurface profile facilitates wide phase modulation of ≈ 355 ° on the reflected light at the individual element level through applying independent voltages to its respective columns and rows. The multi-objective genetic algorithm (GA) for optimizing user-defined metrics toward shaping desired far-zone radiation pattern is implemented. It is demonstrated that multi-objective GA yields better results for directivity and spatial resolution of perimeter-controlled metasurface by identifying the design tradeoffs inherent to the system, compared to the single-objective optimizer. A high directivity and continuous beam scanning with full and wide field-of-view along the azimuth and elevation angles are respectively maintained.
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Affiliation(s)
- Raana Sabri
- Department of Electrical and Computer Engineering, Northeastern University, Boston, MA02115, USA
| | - Hossein Mosallaei
- Department of Electrical and Computer Engineering, Northeastern University, Boston, MA02115, USA
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36
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Wang Z, Ma Y, Li M, Wu L, Guo T, Zheng Y, Chen Q, Fu Y. A Thermal-Switchable Metamaterial Absorber Based on the Phase-Change Material of Vanadium Dioxide. NANOMATERIALS (BASEL, SWITZERLAND) 2022; 12:3000. [PMID: 36080039 PMCID: PMC9457684 DOI: 10.3390/nano12173000] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/29/2022] [Revised: 08/25/2022] [Accepted: 08/29/2022] [Indexed: 06/15/2023]
Abstract
This article presents a thermal-switchable metamaterial absorber (TSMA) based on the phase-change material of vanadium dioxide (VO2). VO2 thin film was deposited on sapphire substrate by magnetron sputtering followed by vacuum annealing treatment. Then, the prepared VO2 film was sliced into tiny chips for thermal-switchable elements. The surface structure of TSMA was realized by loading four VO2 chips into a square metallic loop. The absorption frequency of TSMA was located at 7.3 GHz at room temperature and switched to 6.8 GHz when the temperature was heated above the critical phase transition temperature of VO2. A VO2-based TSMA prototype was fabricated and measured to verify this design. The design is expected to be used in metasurface antennas, sensors, detectors, etc.
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Affiliation(s)
- Zhongbao Wang
- The College of Electronic Science, National University of Defense Technology, Changsha 410073, China
| | - Yanli Ma
- The College of Electronic Science, National University of Defense Technology, Changsha 410073, China
| | - Ming Li
- Key Laboratory of Material Physics, Anhui Key Laboratory of Nanomaterials and Nanotechnology, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, China
| | - Liangfei Wu
- Key Laboratory of Material Physics, Anhui Key Laboratory of Nanomaterials and Nanotechnology, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, China
| | - Tiantian Guo
- The College of Electronic Science, National University of Defense Technology, Changsha 410073, China
| | - Yuejun Zheng
- The College of Electronic Science, National University of Defense Technology, Changsha 410073, China
| | - Qiang Chen
- The College of Electronic Science, National University of Defense Technology, Changsha 410073, China
- Science and Technology on Advanced Ceramic Fibers and Composites Key Laboratory, National University of Defense Technology, Changsha 410073, China
| | - Yunqi Fu
- The College of Electronic Science, National University of Defense Technology, Changsha 410073, China
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37
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Zheng C, Simpson RE, Tang K, Ke Y, Nemati A, Zhang Q, Hu G, Lee C, Teng J, Yang JKW, Wu J, Qiu CW. Enabling Active Nanotechnologies by Phase Transition: From Electronics, Photonics to Thermotics. Chem Rev 2022; 122:15450-15500. [PMID: 35894820 DOI: 10.1021/acs.chemrev.2c00171] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Phase transitions can occur in certain materials such as transition metal oxides (TMOs) and chalcogenides when there is a change in external conditions such as temperature and pressure. Along with phase transitions in these phase change materials (PCMs) come dramatic contrasts in various physical properties, which can be engineered to manipulate electrons, photons, polaritons, and phonons at the nanoscale, offering new opportunities for reconfigurable, active nanodevices. In this review, we particularly discuss phase-transition-enabled active nanotechnologies in nonvolatile electrical memory, tunable metamaterials, and metasurfaces for manipulation of both free-space photons and in-plane polaritons, and multifunctional emissivity control in the infrared (IR) spectrum. The fundamentals of PCMs are first introduced to explain the origins and principles of phase transitions. Thereafter, we discuss multiphysical nanodevices for electronic, photonic, and thermal management, attesting to the broad applications and exciting promises of PCMs. Emerging trends and valuable applications in all-optical neuromorphic devices, thermal data storage, and encryption are outlined in the end.
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Affiliation(s)
- Chunqi Zheng
- Department of Electrical and Computer Engineering, National University of Singapore, Singapore 117583, Singapore.,NUS Graduate School, National University of Singapore, Singapore 119077, Singapore
| | - Robert E Simpson
- Engineering Product Development, Singapore University of Technology and Design (SUTD), Singapore 487372, Singapore
| | - Kechao Tang
- Key Laboratory of Microelectronic Devices and Circuits (MOE), School of Integrated Circuits, Peking University, Beijing 100871, China
| | - Yujie Ke
- Engineering Product Development, Singapore University of Technology and Design (SUTD), Singapore 487372, Singapore
| | - Arash Nemati
- Institute of Materials Research and Engineering, Agency for Science, Technology and Research (A*STAR), Singapore 138634, Singapore
| | - Qing Zhang
- School of Physics, University of Electronic Science and Technology of China, Chengdu 611731, China
| | - Guangwei Hu
- Department of Electrical and Computer Engineering, National University of Singapore, Singapore 117583, Singapore
| | - Chengkuo Lee
- Department of Electrical and Computer Engineering, National University of Singapore, Singapore 117583, Singapore
| | - Jinghua Teng
- Institute of Materials Research and Engineering, Agency for Science, Technology and Research (A*STAR), Singapore 138634, Singapore
| | - Joel K W Yang
- Engineering Product Development, Singapore University of Technology and Design (SUTD), Singapore 487372, Singapore.,Institute of Materials Research and Engineering, Agency for Science, Technology and Research (A*STAR), Singapore 138634, Singapore
| | - Junqiao Wu
- Department of Materials Science and Engineering, University of California, Berkeley, and Lawrence Berkeley National Laboratory, California 94720, United States
| | - Cheng-Wei Qiu
- Department of Electrical and Computer Engineering, National University of Singapore, Singapore 117583, Singapore
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Guan J, Park JE, Deng S, Tan MJH, Hu J, Odom TW. Light-Matter Interactions in Hybrid Material Metasurfaces. Chem Rev 2022; 122:15177-15203. [PMID: 35762982 DOI: 10.1021/acs.chemrev.2c00011] [Citation(s) in RCA: 19] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
This Review focuses on the integration of plasmonic and dielectric metasurfaces with emissive or stimuli-responsive materials for manipulating light-matter interactions at the nanoscale. Metasurfaces, engineered planar structures with rationally designed building blocks, can change the local phase and intensity of electromagnetic waves at the subwavelength unit level and offers more degrees of freedom to control the flow of light. A combination of metasurfaces and nanoscale emitters facilitates access to weak and strong coupling regimes for enhanced photoluminescence, nanoscale lasing, controlled quantum emission, and formation of exciton-polaritons. In addition to emissive materials, functional materials that respond to external stimuli can be combined with metasurfaces to engineer tunable nanophotonic devices. Emerging metasurface designs including surface-functionalized, chemically tunable, and multilayer hybrid metasurfaces open prospects for diverse applications, including photocatalysis, sensing, displays, and quantum information.
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Hsu WL, Chen YC, Yeh SP, Zeng QC, Huang YW, Wang CM. Review of Metasurfaces and Metadevices: Advantages of Different Materials and Fabrications. NANOMATERIALS 2022; 12:nano12121973. [PMID: 35745310 PMCID: PMC9231017 DOI: 10.3390/nano12121973] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/24/2022] [Revised: 05/29/2022] [Accepted: 06/03/2022] [Indexed: 01/27/2023]
Abstract
Flat optics, metasurfaces, metalenses, and related materials promise novel on-demand light modulation within ultrathin layers at wavelength scale, enabling a plethora of next-generation optical devices, also known as metadevices. Metadevices designed with different materials have been proposed and demonstrated for different applications, and the mass production of metadevices is necessary for metadevices to enter the consumer electronics market. However, metadevice manufacturing processes are mainly based on electron beam lithography, which exhibits low productivity and high costs for mass production. Therefore, processes compatible with standard complementary metal–oxide–semiconductor manufacturing techniques that feature high productivity, such as i-line stepper and nanoimprint lithography, have received considerable attention. This paper provides a review of current metasurfaces and metadevices with a focus on materials and manufacturing processes. We also provide an analysis of the relationship between the aspect ratio and efficiency of different materials.
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Affiliation(s)
- Wei-Lun Hsu
- Department of Optics and Photonics, National Central University, Taoyuan 32001, Taiwan; (W.-L.H.); (Y.-C.C.); (S.P.Y.); (Q.-C.Z.)
| | - Yen-Chun Chen
- Department of Optics and Photonics, National Central University, Taoyuan 32001, Taiwan; (W.-L.H.); (Y.-C.C.); (S.P.Y.); (Q.-C.Z.)
| | - Shang Ping Yeh
- Department of Optics and Photonics, National Central University, Taoyuan 32001, Taiwan; (W.-L.H.); (Y.-C.C.); (S.P.Y.); (Q.-C.Z.)
| | - Qiu-Chun Zeng
- Department of Optics and Photonics, National Central University, Taoyuan 32001, Taiwan; (W.-L.H.); (Y.-C.C.); (S.P.Y.); (Q.-C.Z.)
| | - Yao-Wei Huang
- Department of Photonics, National Yang Ming Chiao Tung University, Hsinchu 30010, Taiwan
- Correspondence: (Y.-W.H.); (C.-M.W.)
| | - Chih-Ming Wang
- Department of Optics and Photonics, National Central University, Taoyuan 32001, Taiwan; (W.-L.H.); (Y.-C.C.); (S.P.Y.); (Q.-C.Z.)
- Correspondence: (Y.-W.H.); (C.-M.W.)
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40
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Kim JY, Park J, Holdman GR, Heiden JT, Kim S, Brar VW, Jang MS. Full 2π tunable phase modulation using avoided crossing of resonances. Nat Commun 2022; 13:2103. [PMID: 35440594 PMCID: PMC9018797 DOI: 10.1038/s41467-022-29721-7] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2021] [Accepted: 03/25/2022] [Indexed: 11/09/2022] Open
Abstract
Active metasurfaces have been proposed as one attractive means of achieving high-resolution spatiotemporal control of optical wavefronts, having applications such as LIDAR and dynamic holography. However, achieving full, dynamic phase control has been elusive in metasurfaces. In this paper, we unveil an electrically tunable metasurface design strategy that operates near the avoided crossing of two resonances, one a spectrally narrow, over-coupled resonance and the other with a high resonance frequency tunability. This strategy displays an unprecedented upper limit of 4π range of dynamic phase modulation with no significant variations in optical amplitude, by enhancing the phase tunability through utilizing two coupled resonances. A proof-of-concept metasurface is justified analytically and verified numerically in an experimentally accessible platform using quasi-bound states in the continuum and graphene plasmon resonances, with results showing a 3π phase modulation capacity with a uniform reflection amplitude of ~0.65.
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Affiliation(s)
- Ju Young Kim
- School of Electrical Engineering, Korea Advanced Institute of Science and Technology, Daejeon, 34141, Republic of Korea
| | - Juho Park
- School of Electrical Engineering, Korea Advanced Institute of Science and Technology, Daejeon, 34141, Republic of Korea
| | - Gregory R Holdman
- Department of Physics, University of Wisconsin-Madison, Madison, WI, 53706, USA
| | - Jacob T Heiden
- School of Electrical Engineering, Korea Advanced Institute of Science and Technology, Daejeon, 34141, Republic of Korea
| | - Shinho Kim
- School of Electrical Engineering, Korea Advanced Institute of Science and Technology, Daejeon, 34141, Republic of Korea
| | - Victor W Brar
- Department of Physics, University of Wisconsin-Madison, Madison, WI, 53706, USA.
| | - Min Seok Jang
- School of Electrical Engineering, Korea Advanced Institute of Science and Technology, Daejeon, 34141, Republic of Korea.
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Hong YH, Hsu WC, Tsai WC, Huang YW, Chen SC, Kuo HC. Ultracompact Nanophotonics: Light Emission and Manipulation with Metasurfaces. NANOSCALE RESEARCH LETTERS 2022; 17:41. [PMID: 35366127 PMCID: PMC8976740 DOI: 10.1186/s11671-022-03680-w] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/29/2022] [Accepted: 03/20/2022] [Indexed: 05/09/2023]
Abstract
Internet of Things (IoT) technology is prosperous for the betterment of human well-being. With the expeditious needs of miniature functional devices and systems for adaptive optics and light manipulation at will, relevant sensing techniques are thus in the urgent stage of development. Extensive developments in ultrathin artificial structures, namely metasurfaces, are paving the way for the next-generation devices. A bunch of tunable and reconfigurable metasurfaces with diversified catalogs of mechanisms have been developed recently, enabling dynamic light modulation on demand. On the other hand, monolithic integration of metasurfaces and light-emitting sources form ultracompact meta-devices as well as exhibiting desired functionalities. Photon-matter interaction provides revolution in more compact meta-devices, manipulating light directly at the source. This study presents an outlook on this merging paradigm for ultracompact nanophotonics with metasurfaces, also known as metaphotonics. Recent advances in the field hold great promise for the novel photonic devices with light emission and manipulation in simplicity.
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Affiliation(s)
- Yu-Heng Hong
- Semiconductor Research Center, Hon Hai Research Institute, Taipei, 11492 Taiwan
| | - Wen-Cheng Hsu
- Semiconductor Research Center, Hon Hai Research Institute, Taipei, 11492 Taiwan
- Department of Photonics, National Yang Ming Chiao Tung University, Hsinchu, 30010 Taiwan
| | - Wei-Cheng Tsai
- Department of Photonics, National Yang Ming Chiao Tung University, Hsinchu, 30010 Taiwan
| | - Yao-Wei Huang
- Department of Photonics, National Yang Ming Chiao Tung University, Hsinchu, 30010 Taiwan
| | - Shih-Chen Chen
- Semiconductor Research Center, Hon Hai Research Institute, Taipei, 11492 Taiwan
| | - Hao-Chung Kuo
- Semiconductor Research Center, Hon Hai Research Institute, Taipei, 11492 Taiwan
- Department of Photonics, National Yang Ming Chiao Tung University, Hsinchu, 30010 Taiwan
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42
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Karki A, Cincotti G, Chen S, Stanishev V, Darakchieva V, Wang C, Fahlman M, Jonsson MP. Electrical Tuning of Plasmonic Conducting Polymer Nanoantennas. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2022; 34:e2107172. [PMID: 35064601 DOI: 10.1002/adma.202107172] [Citation(s) in RCA: 13] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/09/2021] [Revised: 01/14/2022] [Indexed: 06/14/2023]
Abstract
Nanostructures of conventional metals offer manipulation of light at the nanoscale but are largely limited to static behavior due to fixed material properties. To develop the next frontier of dynamic nano-optics and metasurfaces, this study utilizes the redox-tunable optical properties of conducting polymers, as recently shown to be capable of sustaining plasmons in their most conducting oxidized state. Electrically tunable conducting polymer nano-optical antennas are presented, using nanodisks of poly(3,4-ethylenedioxythiophene:sulfate) (PEDOT:Sulf) as a model system. In addition to repeated on/off switching of the polymeric nanoantennas, the concept enables gradual electrical tuning of the nano-optical response, which was found to be related to the modulation of both density and mobility of the mobile polaronic charge carriers in the polymer. The resonance position of the PEDOT:Sulf nanoantennas can be conveniently controlled by disk size, here reported down to a wavelength of around 1270 nm. The presented concept may be used for electrically tunable metasurfaces, with tunable farfield as well as nearfield. The work thereby opens for applications ranging from tunable flat meta-optics to adaptable smart windows.
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Affiliation(s)
- Akchheta Karki
- Laboratory of Organic Electronics, Department of Science and Technology (ITN), Linköping University, Norrköping, SE-601 74, Sweden
| | - Giancarlo Cincotti
- Laboratory of Organic Electronics, Department of Science and Technology (ITN), Linköping University, Norrköping, SE-601 74, Sweden
| | - Shangzhi Chen
- Laboratory of Organic Electronics, Department of Science and Technology (ITN), Linköping University, Norrköping, SE-601 74, Sweden
| | - Vallery Stanishev
- Terahertz Materials Analysis Center (THeMAC), Department of Physics, Chemistry and Biology (IFM), Linköping University, Linköping, SE-581 83, Sweden
- Center for III-Nitride Technology, C3NiT-Janzèn, Department of Physics, Chemistry and Biology (IFM), Linköping University, Linköping, SE-581 83, Sweden
| | - Vanya Darakchieva
- Terahertz Materials Analysis Center (THeMAC), Department of Physics, Chemistry and Biology (IFM), Linköping University, Linköping, SE-581 83, Sweden
- Center for III-Nitride Technology, C3NiT-Janzèn, Department of Physics, Chemistry and Biology (IFM), Linköping University, Linköping, SE-581 83, Sweden
- Solid State Physics and NanoLund, Lund University, Lund, S-221 00, Sweden
| | - Chuanfei Wang
- Laboratory of Organic Electronics, Department of Science and Technology (ITN), Linköping University, Norrköping, SE-601 74, Sweden
| | - Mats Fahlman
- Laboratory of Organic Electronics, Department of Science and Technology (ITN), Linköping University, Norrköping, SE-601 74, Sweden
| | - Magnus P Jonsson
- Laboratory of Organic Electronics, Department of Science and Technology (ITN), Linköping University, Norrköping, SE-601 74, Sweden
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43
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Yang J, Gurung S, Bej S, Ni P, Howard Lee HW. Active optical metasurfaces: comprehensive review on physics, mechanisms, and prospective applications. REPORTS ON PROGRESS IN PHYSICS. PHYSICAL SOCIETY (GREAT BRITAIN) 2022; 85:036101. [PMID: 35244609 DOI: 10.1088/1361-6633/ac2aaf] [Citation(s) in RCA: 25] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/30/2020] [Accepted: 09/28/2021] [Indexed: 06/14/2023]
Abstract
Optical metasurfaces with subwavelength thickness hold considerable promise for future advances in fundamental optics and novel optical applications due to their unprecedented ability to control the phase, amplitude, and polarization of transmitted, reflected, and diffracted light. Introducing active functionalities to optical metasurfaces is an essential step to the development of next-generation flat optical components and devices. During the last few years, many attempts have been made to develop tunable optical metasurfaces with dynamic control of optical properties (e.g., amplitude, phase, polarization, spatial/spectral/temporal responses) and early-stage device functions (e.g., beam steering, tunable focusing, tunable color filters/absorber, dynamic hologram, etc) based on a variety of novel active materials and tunable mechanisms. These recently-developed active metasurfaces show significant promise for practical applications, but significant challenges still remain. In this review, a comprehensive overview of recently-reported tunable metasurfaces is provided which focuses on the ten major tunable metasurface mechanisms. For each type of mechanism, the performance metrics on the reported tunable metasurface are outlined, and the capabilities/limitations of each mechanism and its potential for various photonic applications are compared and summarized. This review concludes with discussion of several prospective applications, emerging technologies, and research directions based on the use of tunable optical metasurfaces. We anticipate significant new advances when the tunable mechanisms are further developed in the coming years.
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Affiliation(s)
- Jingyi Yang
- Department of Physics & Astronomy, University of California, Irvine, CA 92697, United States of America
- Department of Physics, Baylor University, Waco, TX 76798, United States of America
| | - Sudip Gurung
- Department of Physics & Astronomy, University of California, Irvine, CA 92697, United States of America
- Department of Physics, Baylor University, Waco, TX 76798, United States of America
| | - Subhajit Bej
- Department of Physics, Baylor University, Waco, TX 76798, United States of America
| | - Peinan Ni
- Department of Physics, Baylor University, Waco, TX 76798, United States of America
| | - Ho Wai Howard Lee
- Department of Physics & Astronomy, University of California, Irvine, CA 92697, United States of America
- Department of Physics, Baylor University, Waco, TX 76798, United States of America
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44
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Eaves-Rathert J, Kovalik E, Ugwu CF, Rogers BR, Pint CL, Valentine JG. Dynamic Color Tuning with Electrochemically Actuated TiO 2 Metasurfaces. NANO LETTERS 2022; 22:1626-1632. [PMID: 35138860 DOI: 10.1021/acs.nanolett.1c04613] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Dynamic tuning of metamaterials is a critical step toward advanced functionality and improved bandwidth. In the visible spectrum, full spectral color tuning is inhibited by the large absorption that accompanies index changes, particularly at blue wavelengths. Here, we show that the electrochemical lithiation of anatase TiO2 to Li0.5TiO2 (LTO) results in an index change of 0.65 at 649 nm with absorption coefficient less than 0.1 at blue wavelengths, making this material well-suited for dynamic visible color tuning. Dynamic tunability of TiO2 is leveraged in a Fabry-Perot cavity and a gap plasmon metasurface. In the Fabry-Perot configuration, the device exhibits a shift in reflectance of over 100 nm when subjected to only 2 V bias while the gap plasmon metasurface achieves enhanced switching speed. The dynamic range, speed, and cyclability indicate that the TiO2/LTO system is competitive with established actuators like WO3, with the additional advantage of reduced absorption at high frequencies.
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Affiliation(s)
- Janna Eaves-Rathert
- Department of Mechanical Engineering, Vanderbilt University, Nashville, Tennessee 37235, United States
| | - Elena Kovalik
- Interdisciplinary Materials Science Program, Vanderbilt University, Nashville, Tennessee 37235, United States
| | - Chibuzor Fabian Ugwu
- Department of Mechanical Engineering, Vanderbilt University, Nashville, Tennessee 37235, United States
| | - Bridget R Rogers
- Department of Chemical and Biomolecular Engineering, Vanderbilt University, Nashville, Tennessee 37235, United States
| | - Cary L Pint
- Department of Mechanical Engineering, Iowa State University, Ames, Iowa 50011, United States
| | - Jason G Valentine
- Department of Mechanical Engineering, Vanderbilt University, Nashville, Tennessee 37235, United States
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45
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Meng Y, Chen Y, Lu L, Ding Y, Cusano A, Fan JA, Hu Q, Wang K, Xie Z, Liu Z, Yang Y, Liu Q, Gong M, Xiao Q, Sun S, Zhang M, Yuan X, Ni X. Optical meta-waveguides for integrated photonics and beyond. LIGHT, SCIENCE & APPLICATIONS 2021; 10:235. [PMID: 34811345 PMCID: PMC8608813 DOI: 10.1038/s41377-021-00655-x] [Citation(s) in RCA: 64] [Impact Index Per Article: 21.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/22/2021] [Revised: 09/17/2021] [Accepted: 09/28/2021] [Indexed: 05/13/2023]
Abstract
The growing maturity of nanofabrication has ushered massive sophisticated optical structures available on a photonic chip. The integration of subwavelength-structured metasurfaces and metamaterials on the canonical building block of optical waveguides is gradually reshaping the landscape of photonic integrated circuits, giving rise to numerous meta-waveguides with unprecedented strength in controlling guided electromagnetic waves. Here, we review recent advances in meta-structured waveguides that synergize various functional subwavelength photonic architectures with diverse waveguide platforms, such as dielectric or plasmonic waveguides and optical fibers. Foundational results and representative applications are comprehensively summarized. Brief physical models with explicit design tutorials, either physical intuition-based design methods or computer algorithms-based inverse designs, are cataloged as well. We highlight how meta-optics can infuse new degrees of freedom to waveguide-based devices and systems, by enhancing light-matter interaction strength to drastically boost device performance, or offering a versatile designer media for manipulating light in nanoscale to enable novel functionalities. We further discuss current challenges and outline emerging opportunities of this vibrant field for various applications in photonic integrated circuits, biomedical sensing, artificial intelligence and beyond.
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Affiliation(s)
- Yuan Meng
- State Key Laboratory of Precision Measurement Technology and Instruments, Department of Precision Instrument, Tsinghua University, 100084, Beijing, China
| | - Yizhen Chen
- Shanghai Engineering Research Center of Ultra-Precision Optical Manufacturing and School of Information, Science and Technology, Fudan University, Shanghai, 200433, China
| | - Longhui Lu
- School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan, 430074, China
| | - Yimin Ding
- Department of Electrical Engineering, Pennsylvania State University, University Park, PA, 16802, USA
| | - Andrea Cusano
- Optoelectronic Division, Department of Engineering, University of Sannio, I-82100, Benevento, Italy
| | - Jonathan A Fan
- Department of Electrical Engineering, Stanford University, Stanford, CA, 94305, USA
| | - Qiaomu Hu
- School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan, 430074, China
| | - Kaiyuan Wang
- School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan, 430074, China
| | - Zhenwei Xie
- Nanophotonics Research Centre, Shenzhen Key Laboratory of Micro-Scale Optical Information Technology, Shenzhen University, Shenzhen, 518060, China
| | - Zhoutian Liu
- State Key Laboratory of Precision Measurement Technology and Instruments, Department of Precision Instrument, Tsinghua University, 100084, Beijing, China
| | - Yuanmu Yang
- State Key Laboratory of Precision Measurement Technology and Instruments, Department of Precision Instrument, Tsinghua University, 100084, Beijing, China
| | - Qiang Liu
- State Key Laboratory of Precision Measurement Technology and Instruments, Department of Precision Instrument, Tsinghua University, 100084, Beijing, China
- Key Laboratory of Photonic Control Technology, Ministry of Education, Tsinghua University, 100084, Beijing, China
| | - Mali Gong
- State Key Laboratory of Precision Measurement Technology and Instruments, Department of Precision Instrument, Tsinghua University, 100084, Beijing, China
- Key Laboratory of Photonic Control Technology, Ministry of Education, Tsinghua University, 100084, Beijing, China
| | - Qirong Xiao
- State Key Laboratory of Precision Measurement Technology and Instruments, Department of Precision Instrument, Tsinghua University, 100084, Beijing, China.
- Key Laboratory of Photonic Control Technology, Ministry of Education, Tsinghua University, 100084, Beijing, China.
| | - Shulin Sun
- Shanghai Engineering Research Center of Ultra-Precision Optical Manufacturing and School of Information, Science and Technology, Fudan University, Shanghai, 200433, China.
- Yiwu Research Institute of Fudan University, Chengbei Road, Yiwu City, 322000, Zhejiang, China.
| | - Minming Zhang
- School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan, 430074, China.
- Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan, 430074, Hubei, China.
| | - Xiaocong Yuan
- Nanophotonics Research Centre, Shenzhen Key Laboratory of Micro-Scale Optical Information Technology, Shenzhen University, Shenzhen, 518060, China
| | - Xingjie Ni
- Department of Electrical Engineering, Pennsylvania State University, University Park, PA, 16802, USA
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46
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Jung C, Kim G, Jeong M, Jang J, Dong Z, Badloe T, Yang JKW, Rho J. Metasurface-Driven Optically Variable Devices. Chem Rev 2021; 121:13013-13050. [PMID: 34491723 DOI: 10.1021/acs.chemrev.1c00294] [Citation(s) in RCA: 59] [Impact Index Per Article: 19.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Optically variable devices (OVDs) are in tremendous demand as optical indicators against the increasing threat of counterfeiting. Conventional OVDs are exposed to the danger of fraudulent replication with advances in printing technology and widespread copying methods of security features. Metasurfaces, two-dimensional arrays of subwavelength structures known as meta-atoms, have been nominated as a candidate for a new generation of OVDs as they exhibit exceptional behaviors that can provide a more robust solution for optical anti-counterfeiting. Unlike conventional OVDs, metasurface-driven OVDs (mOVDs) can contain multiple optical responses in a single device, making them difficult to reverse engineered. Well-known examples of mOVDs include ultrahigh-resolution structural color printing, various types of holography, and polarization encoding. In this review, we discuss the new generation of mOVDs. The fundamentals of plasmonic and dielectric metasurfaces are presented to explain how the optical responses of metasurfaces can be manipulated. Then, examples of monofunctional, tunable, and multifunctional mOVDs are discussed. We follow up with a discussion of the fabrication methods needed to realize these mOVDs, classified into prototyping and manufacturing techniques. Finally, we provide an outlook and classification of mOVDs with respect to their capacity and security level. We believe this newly proposed concept of OVDs may bring about a new era of optical anticounterfeit technology leveraging the novel concepts of nano-optics and nanotechnology.
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Affiliation(s)
- Chunghwan Jung
- Department of Chemical Engineering, Pohang University of Science and Technology (POSTECH), Pohang 37673, Republic of Korea
| | - Gyeongtae Kim
- Department of Mechanical Engineering, Pohang University of Science and Technology (POSTECH), Pohang 37673, Republic of Korea
| | - Minsu Jeong
- Department of Mechanical Engineering, Pohang University of Science and Technology (POSTECH), Pohang 37673, Republic of Korea
| | - Jaehyuck Jang
- Department of Chemical Engineering, Pohang University of Science and Technology (POSTECH), Pohang 37673, Republic of Korea
| | - Zhaogang Dong
- Institute of Materials Research and Engineering, A*STAR (Agency for Science, Technology and Research), 138634, Singapore
| | - Trevon Badloe
- Department of Mechanical Engineering, Pohang University of Science and Technology (POSTECH), Pohang 37673, Republic of Korea
| | - Joel K W Yang
- Institute of Materials Research and Engineering, A*STAR (Agency for Science, Technology and Research), 138634, Singapore.,Engineering Product Development, Singapore University of Technology and Design, 487372, Singapore
| | - Junsuk Rho
- Department of Chemical Engineering, Pohang University of Science and Technology (POSTECH), Pohang 37673, Republic of Korea.,Department of Mechanical Engineering, Pohang University of Science and Technology (POSTECH), Pohang 37673, Republic of Korea.,POSCO-POSTECH-RIST Convergence Research Center for Flat Optics and Metaphotonics, Pohang 37673, Republic of Korea
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47
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Nascimento JH, Pinheiro FA, Silva Neto MB. Spontaneous emission in inertial and dissipative nematic liquid crystals: the role of critical phenomena. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2021; 34:045102. [PMID: 34695813 DOI: 10.1088/1361-648x/ac3306] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/01/2021] [Accepted: 10/25/2021] [Indexed: 06/13/2023]
Abstract
We develop a rigorous, field-theoretical approach to the study of spontaneous emission in inertial and dissipative nematic liquid crystals (LCs), disclosing an alternative application of the massive Stückelberg gauge theory to describe critical phenomena in these systems. This approach allows one not only to unveil the role of phase transitions in the spontaneous emission in LCs but also to make quantitative predictions for quantum emission in realistic nematics of current scientific and technological interest in the field of metamaterials. Specifically, we predict that one can switch on and off quantum emission in LCs by varying the temperature in the vicinities of the crystalline-to-nematic phase transition, for both the inertial and dissipative cases. We also predict from first principles the value of the critical exponent that characterizes such a transition, which we show not only to be independent of the inertial or dissipative dynamics, but also to be in good agreement with experiments. We determine the orientation of the dipole moment of the emitter relative to the nematic director that inhibits spontaneous emission, paving the way to achieve directionality of the emitted radiation, a result that could be applied in tuneable photonic devices such as metasurfaces and tuneable light sources.
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Affiliation(s)
- J H Nascimento
- Instituto de Física, Universidade Federal do Rio de Janeiro, Caixa Postal 68528, Rio de Janeiro-RJ, Brazil
| | - F A Pinheiro
- Instituto de Física, Universidade Federal do Rio de Janeiro, Caixa Postal 68528, Rio de Janeiro-RJ, Brazil
| | - M B Silva Neto
- Instituto de Física, Universidade Federal do Rio de Janeiro, Caixa Postal 68528, Rio de Janeiro-RJ, Brazil
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Yang J, Zhang J. Switchable polarization manipulation at the telecom wavelength based on L-shaped hybrid Au-VO 2 nanoholes. OPTICS EXPRESS 2021; 29:35532-35543. [PMID: 34808984 DOI: 10.1364/oe.440474] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/13/2021] [Accepted: 10/05/2021] [Indexed: 06/13/2023]
Abstract
We propose to achieve switchable polarization manipulation at the telecom wavelength at nanoscale based on L-shaped plasmonic nanoholes in an Au-VO2 film. The L-shaped nanohole acts as a quarter-wave plate or a half-wave plate owing to the phase differences between different plasmon resonant modes, which is controlled by the insulator or metallic phases of VO2. In addition, by changing the structure and removing the bottom Au layer, a switchable full-/quarter-wave plate can be achieved when VO2 transits from the insulating state to the metallic state. Furthermore, we vary the geometrical parameters of the L-shaped hole to tune its resonant spectra and achieve a switchable full-wave plate/polarizer. The multifunctional switchable polarization manipulation abilities together with large bandwidths enable the proposed structures promising applications in nanophotonics and integrated optics.
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Meng Q, Chen X, Xu W, Zhu Z, Qin S, Zhang J, Yuan X. High Q Resonant Graphene Absorber with Lossless Phase Change Material Sb 2S 3. NANOMATERIALS (BASEL, SWITZERLAND) 2021; 11:2820. [PMID: 34835585 PMCID: PMC8623988 DOI: 10.3390/nano11112820] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/27/2021] [Revised: 10/12/2021] [Accepted: 10/20/2021] [Indexed: 12/01/2022]
Abstract
Graphene absorbers have attracted lots of interest in recent years. They provide huge potential for applications such as photodetectors, modulators, and thermal emitters. In this letter, we design a high-quality (Q) factor resonant graphene absorber based on the phase change material Sb2S3. In the proposed structure, a refractive index grating is formed at the subwavelength scale due to the periodical distributions of amorphous and crystalline states, and the structure is intrinsically flat. The numerical simulation shows that nearly 100% absorption can be achieved at the wavelength of 1550 nm, and the Q factor is more than hundreds due to the loss-less value of Sb2S3 in the near-infrared region. The absorption spectra can be engineered by changing the crystallization fraction of the Sb2S3 as well as by varying the duty cycle of the grating, which can be employed not only to switch the resonant wavelength but also to achieve resonances with higher Q factors. This provides a promising method for realizing integrated graphene optoelectronic devices with the desired functionalities.
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Affiliation(s)
- Qi Meng
- College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha 410073, China; (Q.M.); (X.C.); (W.X.); (Z.Z.); (S.Q.); (X.Y.)
- Hunan Provincial Key Laboratory of Novel Nano-Optoelectronic Information Materials and Devices, National University of Defense Technology, Changsha 410073, China
| | - Xingqiao Chen
- College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha 410073, China; (Q.M.); (X.C.); (W.X.); (Z.Z.); (S.Q.); (X.Y.)
- Hunan Provincial Key Laboratory of Novel Nano-Optoelectronic Information Materials and Devices, National University of Defense Technology, Changsha 410073, China
| | - Wei Xu
- College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha 410073, China; (Q.M.); (X.C.); (W.X.); (Z.Z.); (S.Q.); (X.Y.)
- Hunan Provincial Key Laboratory of Novel Nano-Optoelectronic Information Materials and Devices, National University of Defense Technology, Changsha 410073, China
| | - Zhihong Zhu
- College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha 410073, China; (Q.M.); (X.C.); (W.X.); (Z.Z.); (S.Q.); (X.Y.)
- Hunan Provincial Key Laboratory of Novel Nano-Optoelectronic Information Materials and Devices, National University of Defense Technology, Changsha 410073, China
| | - Shiqiao Qin
- College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha 410073, China; (Q.M.); (X.C.); (W.X.); (Z.Z.); (S.Q.); (X.Y.)
- Hunan Provincial Key Laboratory of Novel Nano-Optoelectronic Information Materials and Devices, National University of Defense Technology, Changsha 410073, China
| | - Jianfa Zhang
- College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha 410073, China; (Q.M.); (X.C.); (W.X.); (Z.Z.); (S.Q.); (X.Y.)
- Hunan Provincial Key Laboratory of Novel Nano-Optoelectronic Information Materials and Devices, National University of Defense Technology, Changsha 410073, China
| | - Xiaodong Yuan
- College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha 410073, China; (Q.M.); (X.C.); (W.X.); (Z.Z.); (S.Q.); (X.Y.)
- Hunan Provincial Key Laboratory of Novel Nano-Optoelectronic Information Materials and Devices, National University of Defense Technology, Changsha 410073, China
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Jha PK, Akbari H, Kim Y, Biswas S, Atwater HA. Nanoscale axial position and orientation measurement of hexagonal boron nitride quantum emitters using a tunable nanophotonic environment. NANOTECHNOLOGY 2021; 33:015001. [PMID: 34587599 DOI: 10.1088/1361-6528/ac2b71] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/03/2021] [Accepted: 09/29/2021] [Indexed: 06/13/2023]
Abstract
Color centers in hexagonal boron nitride (hBN) have emerged as promising candidates for single-photon emitters (SPEs) due to their bright emission characteristics at room temperature. In contrast to mono- and few-layeredhBN, color centers in multi-layered flakes show superior emission characteristics such as higher saturation counts and spectral stability. Here, we report a method for determining both the axial position and three-dimensional dipole orientation of SPEs in thickhBN flakes by tuning the photonic local density of states using vanadium dioxide (VO2), a phase change material. Quantum emitters under study exhibit a strong surface-normal dipole orientation, providing some insight on the atomic structure ofhBN SPEs, deeply embedded in thick crystals. Next, we optimized a hot pickup technique to reproducibly transfer thehBN flake from VO2/sapphire substrate onto SiO2/Si substrate and relocated the same emitters. Our approach serves as a practical method to systematically characterize SPEs inhBN prior to integration in quantum photonics systems.
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Affiliation(s)
- Pankaj K Jha
- Thomas J. Watson Laboratory of Applied Physics and Materials Science, California Institute of Technology, Pasadena, CA 91125, United States of America
| | - Hamidreza Akbari
- Thomas J. Watson Laboratory of Applied Physics and Materials Science, California Institute of Technology, Pasadena, CA 91125, United States of America
| | - Yonghwi Kim
- Thomas J. Watson Laboratory of Applied Physics and Materials Science, California Institute of Technology, Pasadena, CA 91125, United States of America
| | - Souvik Biswas
- Thomas J. Watson Laboratory of Applied Physics and Materials Science, California Institute of Technology, Pasadena, CA 91125, United States of America
| | - Harry A Atwater
- Thomas J. Watson Laboratory of Applied Physics and Materials Science, California Institute of Technology, Pasadena, CA 91125, United States of America
- Resnick Sustainability Institute, California Institute of Technology, Pasadena, CA 91125, United States of America
- Joint Center for Artificial Photosynthesis, California Institute of Technology, Pasadena, CA 91125, United States of America
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