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Lin C, Li K, Li M, Dopphoopha B, Zheng J, Wang J, Du S, Li Y, Huang B. Pushing Radiative Cooling Technology to Real Applications. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2024:e2409738. [PMID: 39415410 DOI: 10.1002/adma.202409738] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/07/2024] [Revised: 09/08/2024] [Indexed: 10/18/2024]
Abstract
Radiative cooling is achieved by controlling surface optical behavior toward solar and thermal radiation, offering promising solutions for mitigating global warming, promoting energy saving, and enhancing environmental protection. Despite significant efforts to develop optical surfaces in various forms, five primary challenges remain for practical applications: enhancing optical efficiency, maintaining appearance, managing overcooling, improving durability, and enabling scalable manufacturing. However, a comprehensive review bridging these gaps is currently lacking. This work begins by introducing the optical fundamentals of radiative cooling and its potential applications. It then explores the challenges and discusses advanced solutions through structural design, material selection, and fabrication processes. It aims to provide guidance for future research and industrial development of radiative cooling technology.
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Affiliation(s)
- Chongjia Lin
- Department of Mechanical and Aerospace Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, 999077, China
| | - Keqiao Li
- Department of Mechanical and Aerospace Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, 999077, China
| | - Meng Li
- Department of Mechanical and Aerospace Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, 999077, China
| | - Benjamin Dopphoopha
- Department of Mechanical and Aerospace Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, 999077, China
| | - Jiongzhi Zheng
- Thayer School of Engineering, Dartmouth College, 14 Engineering Dr, Hanover, NH, 03755, USA
| | - Jiazheng Wang
- State Key Laboratory of Fluid Power and Mechatronic Systems, School of Mechanical Engineering, Zhejiang University, Hangzhou, 310027, China
- Key Laboratory of Advanced Manufacturing Technology of Zhejiang Province, School of Mechanical Engineering, Zhejiang University, Hangzhou, 310027, China
| | - Shanshan Du
- State Key Laboratory of Fluid Power and Mechatronic Systems, School of Mechanical Engineering, Zhejiang University, Hangzhou, 310027, China
- Key Laboratory of Advanced Manufacturing Technology of Zhejiang Province, School of Mechanical Engineering, Zhejiang University, Hangzhou, 310027, China
| | - Yang Li
- State Key Laboratory of Fluid Power and Mechatronic Systems, School of Mechanical Engineering, Zhejiang University, Hangzhou, 310027, China
- Key Laboratory of Advanced Manufacturing Technology of Zhejiang Province, School of Mechanical Engineering, Zhejiang University, Hangzhou, 310027, China
| | - Baoling Huang
- Department of Mechanical and Aerospace Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, 999077, China
- HKUST Shenzhen-Hong Kong Collaborative Innovation Research Institute Futian, Shenzhen, 518000, China
- Thrust of Sustainable Energy and Environment, The Hong Kong University of Science and Technology, Guangzhou, 511400, China
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2
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Li C, Pan R, Gu C, Guo H, Li J. Reconfigurable Micro/Nano-Optical Devices Based on Phase Transitions: From Materials, Mechanisms to Applications. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2024; 11:e2306344. [PMID: 38489745 PMCID: PMC11132080 DOI: 10.1002/advs.202306344] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/04/2023] [Revised: 01/10/2024] [Indexed: 03/17/2024]
Abstract
In recent years, numerous efforts have been devoted to exploring innovative micro/nano-optical devices (MNODs) with reconfigurable functionality, which is highly significant because of the progressively increasing requirements for next-generation photonic systems. Fortunately, phase change materials (PCMs) provide an extremely competitive pathway to achieve this goal. The phase transitions induce significant changes to materials in optical, electrical properties or shapes, triggering great research interests in applying PCMs to reconfigurable micro/nano-optical devices (RMNODs). More specifically, the PCMs-based RMNODs can interact with incident light in on-demand or adaptive manners and thus realize unique functions. In this review, RMNODs based on phase transitions are systematically summarized and comprehensively overviewed from materials, phase change mechanisms to applications. The reconfigurable optical devices consisting of three kinds of typical PCMs are emphatically introduced, including chalcogenides, transition metal oxides, and shape memory alloys, highlighting the reversible state switch and dramatic contrast of optical responses along with designated utilities generated by phase transition. Finally, a comprehensive summary of the whole content is given, discussing the challenge and outlooking the potential development of the PCMs-based RMNODs in the future.
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Affiliation(s)
- Chensheng Li
- Beijing National Laboratory for Condensed Matter PhysicsInstitute of PhysicsChinese Academy of SciencesBeijing100190China
- CAS Key Laboratory of Vacuum PhysicsSchool of Physical SciencesUniversity of Chinese Academy of SciencesBeijing100049China
| | - Ruhao Pan
- Beijing National Laboratory for Condensed Matter PhysicsInstitute of PhysicsChinese Academy of SciencesBeijing100190China
| | - Changzhi Gu
- Beijing National Laboratory for Condensed Matter PhysicsInstitute of PhysicsChinese Academy of SciencesBeijing100190China
- CAS Key Laboratory of Vacuum PhysicsSchool of Physical SciencesUniversity of Chinese Academy of SciencesBeijing100049China
| | - Haiming Guo
- Beijing National Laboratory for Condensed Matter PhysicsInstitute of PhysicsChinese Academy of SciencesBeijing100190China
- CAS Key Laboratory of Vacuum PhysicsSchool of Physical SciencesUniversity of Chinese Academy of SciencesBeijing100049China
| | - Junjie Li
- Beijing National Laboratory for Condensed Matter PhysicsInstitute of PhysicsChinese Academy of SciencesBeijing100190China
- CAS Key Laboratory of Vacuum PhysicsSchool of Physical SciencesUniversity of Chinese Academy of SciencesBeijing100049China
- Songshan Lake Materials LaboratoryDongguanGuangdong523808China
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3
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Kim M, Lee S, Kim SJ, Lim BM, Kang BS, Lee HS. Study on the Sodium-Doped Titania Interface-Type Memristor. ACS APPLIED MATERIALS & INTERFACES 2024; 16:16453-16461. [PMID: 38516695 DOI: 10.1021/acsami.3c19531] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/23/2024]
Abstract
Memristors integrated into a crossbar-array architecture (CAA) are promising candidates for analog in-memory computing accelerators. However, the relatively low reliability of the memristor device and sneak current issues in CAA remain the main obstacles. Alkali ion-based interface-type memristors are promising solutions for implementing highly reliable memristor devices and neuromorphic hardware. This interface-type device benefits from self-rectifying and forming-free resistive switching (RS), and exhibits relatively low variation from device to device and cycle to cycle. In a previous report, we introduced an in situ grown Na/TiO2 memristor using atomic layer deposition (ALD) and proposed a RS mechanism from experimentally measured Schottky barrier modulation. Self-rectifying RS characteristics were observed by the asymmetric distribution of Na dopants and oxygen vacancies as the Ti metal used as the adhesion layer for the bottom electrode diffuses over the Pt electrode at 250 °C during the ALD process and is doped into the TiO2 layer. Here, we theoretically verify the modulation of the Schottky barrier at the TiO2/Pt electrode interface by Na ions. This study fabricated a Pt/Na/TiO2/Pt memristor device and confirmed its self-rectifying RS characteristics and stable retention characteristics for 24 h at 85 °C. Additionally, this device exhibited relative standard deviations of 27 and 7% in the high and low resistance states, respectively, in terms of cycle-to-cycle variation. To verify the RS mechanism, we conducted density functional theory simulations to analyze the impact of Na cations at interstitial sites on the Schottky barrier. Our findings can contribute to both fundamental understanding and the design of high-performance memristor devices for neuromorphic computing.
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Affiliation(s)
- Minjae Kim
- Department of Electrical and Computer Engineering, University of Southern California Los Angeles, Los Angeles, California 90089, United States
| | - Sangjun Lee
- Institute of Industrial Science, The University of Tokyo, 4-6-1, Meguro-ku, Tokyo 135-8505, Japan
| | - Seung Ju Kim
- Department of Electrical and Computer Engineering, University of Southern California Los Angeles, Los Angeles, California 90089, United States
| | - Byeong Min Lim
- Department of Advanced Materials Engineering for Information and Electronics, Kyung Hee University, Yongin 17104, Republic of Korea
- Integrated Education Institute for Frontier Science & Technology (BK21 Four), Kyung Hee University, Yongin 17104, Republic of Korea
| | - Byeong-Soo Kang
- Department of Electrical and Computer Engineering, University of Southern California Los Angeles, Los Angeles, California 90089, United States
| | - Hong-Sub Lee
- Department of Advanced Materials Engineering for Information and Electronics, Kyung Hee University, Yongin 17104, Republic of Korea
- Integrated Education Institute for Frontier Science & Technology (BK21 Four), Kyung Hee University, Yongin 17104, Republic of Korea
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Ning Z, Jiang L, Sun J, Lian Y, Yuan Y, Wang R, Li J, Yang Y. Spatial Writing of Ultrafast All-Optical Switching. ACS NANO 2024; 18:9535-9542. [PMID: 38522086 DOI: 10.1021/acsnano.3c12552] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/26/2024]
Abstract
Writing spatial information on ultrafast all-optical switching is essential for constructing ultrafast processing units in photonic applications, such as optical communication and computing networks. However, most methods ignore the fabrication and imaging of controllable switching area, limiting its spatial information and the further design in ultrafast devices. Here, we propose a method to spatially write in ultrafast all-optical switching based on MAPbI3 perovskite with nanocone structure and visualize the switching effect in arbitrary designed area. Due to the light confinement effect of nanocone fabrication using a fs laser, the light is strongly absorbed by perovskite and reach saturable absorption. It leads to ultrafast broadband transmittance change with 25 fs switching time and 10% modulation depth in nanocone perovskite area. Our preparation method offers high efficiency, performance, and flexibility for the spatial writing of ultrafast all-optical switching, which is promising for developing ultrafast all-optical networks and the next generation of communication technology.
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Affiliation(s)
- Ziqian Ning
- Laser Micro/Nano Fabrication Laboratory, School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, P. R. China
| | - Lan Jiang
- Laser Micro/Nano Fabrication Laboratory, School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, P. R. China
- Yangtze Delta Region Academy of Beijing Institute of Technology, Jiaxing 314019, P. R. China
- Beijing Institute of Technology Chongqing Innovation Center, Chongqing 401120, P. R. China
| | - Jingya Sun
- Laser Micro/Nano Fabrication Laboratory, School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, P. R. China
- Yangtze Delta Region Academy of Beijing Institute of Technology, Jiaxing 314019, P. R. China
| | - Yiling Lian
- Laser Micro/Nano Fabrication Laboratory, School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, P. R. China
| | - Yongjiu Yuan
- Department of Mechanical Engineering, City University of Hong Kong, Hong Kong 999077, China
| | - Ruiyang Wang
- Laser Micro/Nano Fabrication Laboratory, School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, P. R. China
| | - Jiafang Li
- School of Physics, Beijing Institute of Technology, Beijing 100081, P. R. China
| | - Yang Yang
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, P.O. Box 603, Beijing 100190, P. R. China
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5
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Han W, Dai Y, Wei D, Zhang X, Han L, Peng B, Jiao S, Weng S, Zuo P, Jiang L. Active Property-Structure Integrated Reconfiguration of Individual Resonant Nanoparticles. ACS APPLIED MATERIALS & INTERFACES 2024; 16:2836-2846. [PMID: 38189158 DOI: 10.1021/acsami.3c12808] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/09/2024]
Abstract
Property-structure reconfigurable nanoparticles (NPs) provide additional flexibility for effectively and flexibly manipulating light at the nanoscale. This has facilitated the development of various multifunctional and high-performance nanophotonic devices. Resonant NPs based on dielectric active materials, especially phase change materials, are particularly promising for achieving reconfigurability. However, the on-demand control of the properties, especially the morphology, in individual dielectric resonant NP remains a significant challenge. In this study, we present an all-optical approach for one-step fabrication of Ge2Sb2Te5 (GST) hemispherical NPs, integrated active reversible phase-state switching, and morphology reshaping. Reversible optical switching is demonstrated, attributed to reversible phase-state changes, along with unidirectional modifications to their scattering intensity resulting from morphology reshaping. This novel technology allows the precise adjustment of each structural pixel without affecting the overall functionality of the switchable nanophotonic device. It is highly suitable for applications in single-pixel-addressable active optical devices, structural color displays, and information storage, among others.
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Affiliation(s)
- Weina Han
- Laser Micro/Nano Fabrication Laboratory, School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, China
- Beijing Institute of Technology Chongqing Innovation Center, Chongqing 401120, China
| | - Yuling Dai
- Laser Micro/Nano Fabrication Laboratory, School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, China
- Beijing Institute of Technology Chongqing Innovation Center, Chongqing 401120, China
| | - Donghui Wei
- Laser Micro/Nano Fabrication Laboratory, School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, China
| | - Xingyi Zhang
- Laser Micro/Nano Fabrication Laboratory, School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, China
- Beijing Institute of Technology Chongqing Innovation Center, Chongqing 401120, China
| | - Luna Han
- Laser Micro/Nano Fabrication Laboratory, School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, China
| | - Biye Peng
- Laser Micro/Nano Fabrication Laboratory, School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, China
- Beijing Institute of Technology Chongqing Innovation Center, Chongqing 401120, China
| | - Shuhui Jiao
- Laser Micro/Nano Fabrication Laboratory, School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, China
| | - Shayuan Weng
- Laser Micro/Nano Fabrication Laboratory, School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, China
- Beijing Institute of Technology Chongqing Innovation Center, Chongqing 401120, China
| | - Pei Zuo
- School of Mechanical and Electrical Engineering, Wuhan Institute of Technology, Wuhan 430073, China
| | - Lan Jiang
- Laser Micro/Nano Fabrication Laboratory, School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, China
- Beijing Institute of Technology Chongqing Innovation Center, Chongqing 401120, China
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Schenk FM, Zellweger T, Kumaar D, Bošković D, Wintersteller S, Solokha P, De Negri S, Emboras A, Wood V, Yarema M. Phase-Change Memory from Molecular Tellurides. ACS NANO 2024; 18:1063-1072. [PMID: 38117038 PMCID: PMC10786157 DOI: 10.1021/acsnano.3c10312] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/20/2023] [Revised: 12/13/2023] [Accepted: 12/15/2023] [Indexed: 12/21/2023]
Abstract
Phase-change memory (PCM) is an emerging memory technology based on the resistance contrast between the crystalline and amorphous states of a material. Further development and realization of PCM as a mainstream memory technology rely on innovative materials and inexpensive fabrication methods. Here, we propose a generalizable and scalable solution-processing approach to synthesize phase-change telluride inks in order to meet demands for high-throughput material screening, increased energy efficiency, and advanced device architectures. Bulk tellurides, such as Sb2Te3, GeTe, Sc2Te3, and TiTe2, are dissolved and purified to obtain inks of molecular metal telluride complexes. This allowed us to unlock a wide range of solution-processed ternary tellurides by the simple mixing of binary inks. We demonstrate accurate and quantitative composition control, including prototype materials (Ge-Sb-Te) and emerging rare-earth-metal telluride-doped materials (Sc-Sb-Te). Spin-coating and annealing convert ink formulations into high-quality, phase-pure telluride films with preferred orientation along the (00l) direction. Deposition engineering of liquid tellurides enables thickness-tunable films, infilling of nanoscale vias, and film preparation on flexible substrates. Finally, we demonstrate cyclable and non-volatile prototype memory devices, achieving performance indicators such as resistance contrast and low reset energy on par with state-of-the-art sputtered PCM layers.
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Affiliation(s)
- Florian M Schenk
- Chemistry and Materials Design Group, Institute for Electronics, Department of Information Technology and Electrical Engineering, ETH Zurich, Gloriastrasse 35, CH-8092 Zurich, Switzerland
| | - Till Zellweger
- Integrated Systems Laboratory, Department of Information Technology and Electrical Engineering, ETH Zurich, Gloriastrasse 35, CH-8092 Zurich, Switzerland
| | - Dhananjeya Kumaar
- Chemistry and Materials Design Group, Institute for Electronics, Department of Information Technology and Electrical Engineering, ETH Zurich, Gloriastrasse 35, CH-8092 Zurich, Switzerland
| | - Darijan Bošković
- Chemistry and Materials Design Group, Institute for Electronics, Department of Information Technology and Electrical Engineering, ETH Zurich, Gloriastrasse 35, CH-8092 Zurich, Switzerland
| | - Simon Wintersteller
- Chemistry and Materials Design Group, Institute for Electronics, Department of Information Technology and Electrical Engineering, ETH Zurich, Gloriastrasse 35, CH-8092 Zurich, Switzerland
| | - Pavlo Solokha
- Dipartimento di Chimica e Chimica Industriale, Università degli Studi di Genova, I-16146 Genova, Italy
| | - Serena De Negri
- Dipartimento di Chimica e Chimica Industriale, Università degli Studi di Genova, I-16146 Genova, Italy
| | - Alexandros Emboras
- Integrated Systems Laboratory, Department of Information Technology and Electrical Engineering, ETH Zurich, Gloriastrasse 35, CH-8092 Zurich, Switzerland
| | - Vanessa Wood
- Materials and Device Engineering Group, Institute for Electronics, Department of Information Technology and Electrical Engineering, ETH Zurich, Gloriastrasse 35, CH-8092 Zurich, Switzerland
| | - Maksym Yarema
- Chemistry and Materials Design Group, Institute for Electronics, Department of Information Technology and Electrical Engineering, ETH Zurich, Gloriastrasse 35, CH-8092 Zurich, Switzerland
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7
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Wu C, Deng H, Huang YS, Yu H, Takeuchi I, Ríos Ocampo CA, Li M. Freeform direct-write and rewritable photonic integrated circuits in phase-change thin films. SCIENCE ADVANCES 2024; 10:eadk1361. [PMID: 38181081 PMCID: PMC10775994 DOI: 10.1126/sciadv.adk1361] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/04/2023] [Accepted: 12/01/2023] [Indexed: 01/07/2024]
Abstract
Photonic integrated circuits (PICs) with rapid prototyping and reprogramming capabilities promise revolutionary impacts on a plethora of photonic technologies. We report direct-write and rewritable photonic circuits on a low-loss phase-change material (PCM) thin film. Complete end-to-end PICs are directly laser-written in one step without additional fabrication processes, and any part of the circuit can be erased and rewritten, facilitating rapid design modification. We demonstrate the versatility of this technique for diverse applications, including an optical interconnect fabric for reconfigurable networking, a photonic crossbar array for optical computing, and a tunable optical filter for optical signal processing. By combining the programmability of the direct laser writing technique with PCM, our technique unlocks opportunities for programmable photonic networking, computing, and signal processing. Moreover, the rewritable photonic circuits enable rapid prototyping and testing in a convenient and cost-efficient manner, eliminate the need for nanofabrication facilities, and thus promote the proliferation of photonics research and education to a broader community.
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Affiliation(s)
- Changming Wu
- Department of Electrical and Computer Engineering, University of Washington, Seattle, WA 98195, USA
| | - Haoqin Deng
- Department of Electrical and Computer Engineering, University of Washington, Seattle, WA 98195, USA
| | - Yi-Siou Huang
- Department of Materials Science and Engineering, University of Maryland, College Park, MD 20742, USA
- Institute for Research in Electronics and Applied Physics, University of Maryland, College Park, MD 20742, USA
| | - Heshan Yu
- Department of Materials Science and Engineering, University of Maryland, College Park, MD 20742, USA
- School of Microelectronics, Tianjin University, Tianjin 300072, China
| | - Ichiro Takeuchi
- Department of Materials Science and Engineering, University of Maryland, College Park, MD 20742, USA
| | - Carlos A. Ríos Ocampo
- Department of Materials Science and Engineering, University of Maryland, College Park, MD 20742, USA
- Institute for Research in Electronics and Applied Physics, University of Maryland, College Park, MD 20742, USA
| | - Mo Li
- Department of Electrical and Computer Engineering, University of Washington, Seattle, WA 98195, USA
- Department of Physics, University of Washington, Seattle, WA 98195, USA
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8
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Liu X, Kan Y, Kumar S, Kulikova LF, Davydov VA, Agafonov VN, Zhao C, Bozhevolnyi SI. Ultracompact Single-Photon Sources of Linearly Polarized Vortex Beams. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2024; 36:e2304495. [PMID: 37543837 DOI: 10.1002/adma.202304495] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/12/2023] [Revised: 07/25/2023] [Indexed: 08/07/2023]
Abstract
Ultracompact chip-integrated single-photon sources of collimated beams with polarization-encoded states are crucial for integrated quantum technologies. However, most of currently available single-photon sources rely on external bulky optical components to shape the polarization and phase front of emitted photon beams. Efficient integration of quantum emitters with beam shaping and polarization encoding functionalities remains so far elusive. Here, ultracompact single-photon sources of linearly polarized vortex beams based on chip-integrated quantum emitter-coupled metasurfaces are presented, which are meticulously designed by fully exploiting the potential of nanobrick-arrayed metasurfaces. The authors first demonstrate on-chip single-photon generation of high-purity linearly polarized vortex beams with prescribed topological charges of 0, - 1, and +1. The multiplexing of single-photon emission channels with orthogonal linear polarizations carrying different topological charges are further realized and their entanglement is demonstarated. The work illustrates the potential and feasibility of ultracompact quantum emitter-coupled metasurfaces as a new quantum optics platform for realizing chip-integrated high-dimensional single-photon sources.
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Affiliation(s)
- Xujing Liu
- Institute of Engineering Thermophysics, Shanghai Jiao Tong University, Shanghai, 200240, China
- Center for Nano Optics, University of Southern Denmark, Odense M, DK-5230, Denmark
| | - Yinhui Kan
- Center for Nano Optics, University of Southern Denmark, Odense M, DK-5230, Denmark
| | - Shailesh Kumar
- Center for Nano Optics, University of Southern Denmark, Odense M, DK-5230, Denmark
| | - Liudmilla F Kulikova
- L.F. Vereshchagin Institute for High Pressure Physics, Russian Academy of Sciences, Moscow, 142190, Russia
| | - Valery A Davydov
- L.F. Vereshchagin Institute for High Pressure Physics, Russian Academy of Sciences, Moscow, 142190, Russia
| | | | - Changying Zhao
- Institute of Engineering Thermophysics, Shanghai Jiao Tong University, Shanghai, 200240, China
| | - Sergey I Bozhevolnyi
- Center for Nano Optics, University of Southern Denmark, Odense M, DK-5230, Denmark
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9
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Conrads L, Heßler A, Völkel L, Wilden K, Strauch A, Pries J, Wuttig M, Taubner T. Infrared Resonance Tuning of Nanoslit Antennas with Phase-Change Materials. ACS NANO 2023; 17:25721-25730. [PMID: 38085927 DOI: 10.1021/acsnano.3c11121] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/27/2023]
Abstract
Phase-change materials (PCMs) have been established as prime candidates for nonvolatile resonance tuning of nanophotonic components based on a large optical contrast between their amorphous and crystalline states. Recently, the plasmonic PCM In3SbTe2 was introduced, which can be switched from an amorphous dielectric state to a crystalline metallic one over the entire infrared spectral range. While locally switching the PCM around metallic nanorod antennas has already been demonstrated, similar tuning of inverse antenna structures (nanoslits) has not yet been investigated. Here, we demonstrate optical resonance tuning of nanoslit antennas with dielectric and plasmonic PCMs. We compare two geometries with fundamentally different resonance tuning mechanisms: tuning the resonance of aluminum slit antennas by change of the refractive index (dielectric PCM Ge3Sb2Te6), and creating slit-like volumes of amorphous In3SbTe2 and modifying the slit geometry directly (plasmonic PCM In3SbTe2). While the tuning range with the plasmonic PCM is about 3.4 μm and only limited by fabrication, the resonances with the dielectric PCM feature a three times larger quality factor compared to resonances obtained with the plasmonic PCM.
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Affiliation(s)
- Lukas Conrads
- Institute of Physics (IA), RWTH Aachen University, Aachen D-52056, Germany
| | - Andreas Heßler
- Institute of Physics (IA), RWTH Aachen University, Aachen D-52056, Germany
| | - Lukas Völkel
- Institute of Physics (IA), RWTH Aachen University, Aachen D-52056, Germany
| | - Kilian Wilden
- Institute of Physics (IA), RWTH Aachen University, Aachen D-52056, Germany
| | - Achim Strauch
- Institute of Physics (IA), RWTH Aachen University, Aachen D-52056, Germany
| | - Julian Pries
- Institute of Physics (IA), RWTH Aachen University, Aachen D-52056, Germany
| | - Matthias Wuttig
- Institute of Physics (IA), RWTH Aachen University, Aachen D-52056, Germany
| | - Thomas Taubner
- Institute of Physics (IA), RWTH Aachen University, Aachen D-52056, Germany
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10
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Wang X, Lu X, Xia Z. Realization of a photoswitchable anapole metasurface based on phase change material Ge 2Sb 2Te 5. APPLIED OPTICS 2023; 62:9253-9260. [PMID: 38108695 DOI: 10.1364/ao.503134] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/11/2023] [Accepted: 11/08/2023] [Indexed: 12/19/2023]
Abstract
The electromagnetic anapole mode originates from the phase cancellation interference between the far-field radiation of an oscillating electric dipole moment and toroidal dipole moment, which presents a radiation-free state of light while enhancing the near-field, and has potential applications in micro- and nanophotonics. The active control of the anapole is crucial for the design and realization of tunable photonic devices. In this paper, we realize dynamic tuning of an anapole metasurface and metasurface optical switching based on the phase change material G e 2 S b 2 T e 5 (GST). By utilizing the destructive interference of the electric dipole moment and ring dipole moment, we design the non-radiative anapole mode. At the same time, we introduce the phase change material GST to dynamically regulate the intensity and position of the far-field scattering, electric field, and transmission spectra, and to realize the transition from anapole mode to electric dipole mode. At the same time, the modulation of the transmission spectrum by the metasurface after the addition of GST film is achieved. A relative transmission modulation of 640.62% is achieved. Our study provides ideas for realizing effective active modulation of active micro- and nanophotonic devices, and promotes active modulation of active micro- and nanophotonic devices in lasers and filters and potential applications in dynamic near-field imaging.
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11
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Wang Z, Zhao S, Jiang H, Peng K, Zhao W. Broadband and strength-switchable circular dichroism in a Ge 2Sb 2Te 5-based metasurface. APPLIED OPTICS 2023; 62:8587-8592. [PMID: 38037974 DOI: 10.1364/ao.501172] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/20/2023] [Accepted: 10/16/2023] [Indexed: 12/02/2023]
Abstract
Circular dichroism (CD) is highly required in the applications of biological detection and analytical chemistry. In this paper, we achieved a giant, broadband, and strength-switchable CD effect in a quadruple z-shaped G e 2 S b 2 T e 5 (GST) metasurface. At the amorphous state of GST (a-GST), the giant CD reaches 0.92 and the width of the absorption >0.80 is about 100 nm. The giant and broadband CD originates from polarization selective excitations of Mie resonances and the coupling between subunit resonators. With the transition from a-GST to crystalline GST, CD could be dynamically switched from 0.92 to 0.05. The GST-based metasurfaces with giant and wide-range switching CD will promote the development of active chiral devices.
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12
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Prabhathan P, Sreekanth KV, Teng J, Ko JH, Yoo YJ, Jeong HH, Lee Y, Zhang S, Cao T, Popescu CC, Mills B, Gu T, Fang Z, Chen R, Tong H, Wang Y, He Q, Lu Y, Liu Z, Yu H, Mandal A, Cui Y, Ansari AS, Bhingardive V, Kang M, Lai CK, Merklein M, Müller MJ, Song YM, Tian Z, Hu J, Losurdo M, Majumdar A, Miao X, Chen X, Gholipour B, Richardson KA, Eggleton BJ, Sharda K, Wuttig M, Singh R. Roadmap for phase change materials in photonics and beyond. iScience 2023; 26:107946. [PMID: 37854690 PMCID: PMC10579438 DOI: 10.1016/j.isci.2023.107946] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2023] Open
Abstract
Phase Change Materials (PCMs) have demonstrated tremendous potential as a platform for achieving diverse functionalities in active and reconfigurable micro-nanophotonic devices across the electromagnetic spectrum, ranging from terahertz to visible frequencies. This comprehensive roadmap reviews the material and device aspects of PCMs, and their diverse applications in active and reconfigurable micro-nanophotonic devices across the electromagnetic spectrum. It discusses various device configurations and optimization techniques, including deep learning-based metasurface design. The integration of PCMs with Photonic Integrated Circuits and advanced electric-driven PCMs are explored. PCMs hold great promise for multifunctional device development, including applications in non-volatile memory, optical data storage, photonics, energy harvesting, biomedical technology, neuromorphic computing, thermal management, and flexible electronics.
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Affiliation(s)
- Patinharekandy Prabhathan
- Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, Singapore 637371, Singapore
- Centre for Disruptive Photonic Technologies, The Photonic Institute, 50 Nanyang Avenue, Singapore 639798, Singapore
| | - Kandammathe Valiyaveedu Sreekanth
- Institute of Materials Research and Engineering (IMRE), Agency for Science, Technology and Research (A∗STAR), 2 Fusionopolis Way, Innovis #08-03, Singapore 138634, Republic of Singapore
| | - Jinghua Teng
- Institute of Materials Research and Engineering (IMRE), Agency for Science, Technology and Research (A∗STAR), 2 Fusionopolis Way, Innovis #08-03, Singapore 138634, Republic of Singapore
| | - Joo Hwan Ko
- School of Electrical Engineering and Computer Science, Gwangju Institute of Science and Technology, Gwangju 61005, Republic of Korea
| | - Young Jin Yoo
- 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
| | - Yubin Lee
- School of Materials Science and Engineering, Gwangju Institute of Science and Technology, Gwangju 61005, Republic of Korea
| | - Shoujun Zhang
- DELL, Center for Terahertz Waves and College of Precision Instrument and Optoelectronics Engineering, Key Laboratory of Optoelectronic Information Technology (Ministry of Education of China), Tianjin University, Tianjin 300072, China
| | - Tun Cao
- DELL, School of Optoelectronic Engineering and Instrumentation Science, Dalian University of Technology, Dalian 116024, China
| | - Cosmin-Constantin Popescu
- Department of Materials Science & Engineering, Massachusetts Institute of Technology, Cambridge, MA, USA
| | - Brian Mills
- Department of Materials Science & Engineering, Massachusetts Institute of Technology, Cambridge, MA, USA
| | - Tian Gu
- Department of Materials Science & Engineering, Massachusetts Institute of Technology, Cambridge, MA, USA
- Materials Research Laboratory, Massachusetts Institute of Technology, Cambridge, MA, USA
| | - Zhuoran Fang
- Department of Electrical & Computer Engineering, University of Washington, Washington, Seattle, USA
| | - Rui Chen
- Department of Electrical & Computer Engineering, University of Washington, Washington, Seattle, USA
| | - Hao Tong
- Wuhan National Research Center for Optoelectronics, School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan, China
| | - Yi Wang
- Wuhan National Research Center for Optoelectronics, School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan, China
| | - Qiang He
- Wuhan National Research Center for Optoelectronics, School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan, China
| | - Yitao Lu
- Wuhan National Research Center for Optoelectronics, School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan, China
| | - Zhiyuan Liu
- Wuhan National Research Center for Optoelectronics, School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan, China
| | - Han Yu
- Institute of Advanced Materials, Beijing Normal University, Beijing 100875, China
| | - Avik Mandal
- Nanoscale Optics Lab, ECE Department, University of Alberta, Edmonton, Canada
| | - Yihao Cui
- Nanoscale Optics Lab, ECE Department, University of Alberta, Edmonton, Canada
| | - Abbas Sheikh Ansari
- Nanoscale Optics Lab, ECE Department, University of Alberta, Edmonton, Canada
| | - Viraj Bhingardive
- Nanoscale Optics Lab, ECE Department, University of Alberta, Edmonton, Canada
| | - Myungkoo Kang
- CREOL, College of Optics and Photonics, University of Central Florida, Orlando, FL, USA
| | - Choon Kong Lai
- Institute of Photonics and Optical Science (IPOS), School of Physics, The University of Sydney, New South Wales, NSW 2006, Australia
- The University of Sydney Nano Institute (Sydney Nano), The University of Sydney, New South Wales, NSW 2006, Australia
| | - Moritz Merklein
- Institute of Photonics and Optical Science (IPOS), School of Physics, The University of Sydney, New South Wales, NSW 2006, Australia
- The University of Sydney Nano Institute (Sydney Nano), The University of Sydney, New South Wales, NSW 2006, Australia
| | | | - Young Min Song
- School of Electrical Engineering and Computer Science, Gwangju Institute of Science and Technology, Gwangju 61005, Republic of Korea
- Anti-Viral Research Center, 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
| | - Zhen Tian
- DELL, Center for Terahertz Waves and College of Precision Instrument and Optoelectronics Engineering, Key Laboratory of Optoelectronic Information Technology (Ministry of Education of China), Tianjin University, Tianjin 300072, China
| | - Juejun Hu
- Department of Materials Science & Engineering, Massachusetts Institute of Technology, Cambridge, MA, USA
- Materials Research Laboratory, Massachusetts Institute of Technology, Cambridge, MA, USA
| | - Maria Losurdo
- Istituto di Chimica della Materia Condensata e di Tecnologie per l'Energia, CNR-ICMATE, Corso Stati Uniti 4, 35127 Padova, Italy
| | - Arka Majumdar
- Department of Electrical & Computer Engineering, University of Washington, Washington, Seattle, USA
| | - Xiangshui Miao
- Wuhan National Research Center for Optoelectronics, School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan, China
| | - Xiao Chen
- Institute of Advanced Materials, Beijing Normal University, Beijing 100875, China
| | - Behrad Gholipour
- Nanoscale Optics Lab, ECE Department, University of Alberta, Edmonton, Canada
| | - Kathleen A. Richardson
- CREOL, College of Optics and Photonics, University of Central Florida, Orlando, FL, USA
- Department of Materials Science and Engineering, University of Central Florida, Orlando, FL, USA
| | - Benjamin J. Eggleton
- Institute of Photonics and Optical Science (IPOS), School of Physics, The University of Sydney, New South Wales, NSW 2006, Australia
- The University of Sydney Nano Institute (Sydney Nano), The University of Sydney, New South Wales, NSW 2006, Australia
| | - Kanudha Sharda
- iScience, Cell Press, 125 London Wall, Barbican, London EC2Y 5AJ, UK
- iScience, Cell Press, RELX India Pvt Ltd., 14th Floor, Building No. 10B, DLF Cyber City, Phase II, Gurugram, Haryana 122002, India
| | - Matthias Wuttig
- Institute of Physics IA, RWTH Aachen University, 52074 Aachen, Germany
- Peter Grünberg Institute (PGI 10), Forschungszentrum Jülich, 52428 Jülich, Germany
| | - Ranjan Singh
- Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, Singapore 637371, Singapore
- Centre for Disruptive Photonic Technologies, The Photonic Institute, 50 Nanyang Avenue, Singapore 639798, Singapore
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13
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Nobile N, Erickson JR, Ríos C, Zhang Y, Hu J, Vitale SA, Xiong F, Youngblood N. Time-Resolved Temperature Mapping Leveraging the Strong Thermo-Optic Effect in Phase-Change Materials. ACS PHOTONICS 2023; 10:3576-3585. [PMID: 37869555 PMCID: PMC10588450 DOI: 10.1021/acsphotonics.3c00620] [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: 05/09/2023] [Indexed: 10/24/2023]
Abstract
Optical phase-change materials are highly promising for emerging applications such as tunable metasurfaces, reconfigurable photonic circuits, and non-von Neumann computing. However, these materials typically require both high melting temperatures and fast quenching rates to reversibly switch between their crystalline and amorphous phases: a significant challenge for large-scale integration. In this work, we use temperature-dependent ellipsometry to study the thermo-optic effect in GST and use these results to demonstrate an experimental technique that leverages the thermo-optic effect in GST to enable both spatial and temporal thermal measurements of two common electro-thermal microheater designs currently used by the phase-change community. Our approach shows excellent agreement between experimental results and numerical simulations and provides a noninvasive method for rapid characterization of electrically programmable phase-change devices.
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Affiliation(s)
- Nicholas
A. Nobile
- University
of Pittsburgh, Deppartments of
Electrical and Computer Engineering, Pittsburgh, Pennsylvania 15261, United States
| | - John R. Erickson
- University
of Pittsburgh, Deppartments of
Electrical and Computer Engineering, Pittsburgh, Pennsylvania 15261, United States
| | - Carlos Ríos
- University
of Maryland, Departments of
Materials Science and Engineering, College Park, Maryland 20742, United States
- University
of Maryland, Institute for Research
in Electronics and Applied Physics, College Park, Maryland 20742, United States
| | - Yifei Zhang
- MIT, Departments of
Materials Science and Engineering, Cambridge, Massachusetts 02139, United States
| | - Juejun Hu
- MIT, Departments of
Materials Science and Engineering, Cambridge, Massachusetts 02139, United States
| | - Steven A. Vitale
- Advanced
Materials and Microsystems Group, MIT Lincoln
Laboratory, Lexington, Massachusetts 02421, United States
| | - Feng Xiong
- University
of Pittsburgh, Deppartments of
Electrical and Computer Engineering, Pittsburgh, Pennsylvania 15261, United States
| | - Nathan Youngblood
- University
of Pittsburgh, Deppartments of
Electrical and Computer Engineering, Pittsburgh, Pennsylvania 15261, United States
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14
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Li S, Simpson RE, Shin S. Enhanced far-field coherent thermal emission using mid-infrared bilayer metasurfaces. NANOSCALE 2023; 15:15965-15974. [PMID: 37553963 DOI: 10.1039/d3nr02079g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 08/10/2023]
Abstract
A classical thermal source, such as an incandescent filament, radiates according to Planck's law. The feasibility of super-Planckian radiation has been investigated with sub-wavelength-sized sources in the last decade. In such sources, a crystal-dependent coupling of photons and optical phonons is possible at thermal energies corresponding to that at room temperature. This interaction can be used to tailor the far-field thermal emission in a coherent manner; however, understanding heat transfer during this process is still nascent. Here, we used a novel measurement platform to quantify thermal signals in a Ge2Sb2Te5/SiO2 nanoribbon structure. We were able to separate and quantify the radiated and conducted heat transfer mechanisms. The thermal emission from the Ge2Sb2Te5/SiO2 nanoribbons was enhanced by 3.5× compared to that of a bare SiO2 nanoribbon. Our model revealed that this enhancement was directly due to polaritonic heat transfer, which was possible due to the large and lossless dielectric permittivity of Ge2Sb2Te5 at mid-IR frequencies. This study directly probes the far-field emission with a thermal gradient stimulated by Joule heating in temperature ranges from 100 to 400 K, which bridges the gap between mid-IR optics and thermal engineering.
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Affiliation(s)
- Sichao Li
- Department of Mechanical Engineering, Collage of Design and Engineering, National University of Singapore, 9 Engineering Drive 1, 117575, Singapore.
| | - Robert E Simpson
- School of Engineering, University of Birmingham, Edgbaston, B15 2TT, UK
| | - Sunmi Shin
- Department of Mechanical Engineering, Collage of Design and Engineering, National University of Singapore, 9 Engineering Drive 1, 117575, Singapore.
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15
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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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16
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Saha S, Diroll BT, Ozlu MG, Chowdhury SN, Peana S, Kudyshev Z, Schaller RD, Jacob Z, Shalaev VM, Kildishev AV, Boltasseva A. Engineering the temporal dynamics of all-optical switching with fast and slow materials. Nat Commun 2023; 14:5877. [PMID: 37735167 PMCID: PMC10514334 DOI: 10.1038/s41467-023-41377-5] [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: 10/28/2022] [Accepted: 09/01/2023] [Indexed: 09/23/2023] Open
Abstract
All-optical switches control the amplitude, phase, and polarization of light using optical control pulses. They can operate at ultrafast timescales - essential for technology-driven applications like optical computing, and fundamental studies like time-reflection. Conventional all-optical switches have a fixed switching time, but this work demonstrates that the response-time can be controlled by selectively controlling the light-matter-interaction in so-called fast and slow materials. The bi-material switch has a nanosecond response when the probe interacts strongly with titanium nitride near its epsilon-near-zero (ENZ) wavelength. The response-time speeds up over two orders of magnitude with increasing probe-wavelength, as light's interaction with the faster Aluminum-doped zinc oxide (AZO) increases, eventually reaching the picosecond-scale near AZO's ENZ-regime. This scheme provides several additional degrees of freedom for switching time control, such as probe-polarization and incident angle, and the pump-wavelength. This approach could lead to new functionalities within key applications in multiband transmission, optical computing, and nonlinear optics.
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Affiliation(s)
- Soham Saha
- School of Electrical and Computer Engineering, Birck Nanotechnology Center, Purdue University, West Lafayette, IN, USA
- Argonne National Laboratory, Lemont, IL, 60439, USA
| | | | - Mustafa Goksu Ozlu
- School of Electrical and Computer Engineering, Birck Nanotechnology Center, Purdue University, West Lafayette, IN, USA
| | - Sarah N Chowdhury
- School of Electrical and Computer Engineering, Birck Nanotechnology Center, Purdue University, West Lafayette, IN, USA
| | - Samuel Peana
- School of Electrical and Computer Engineering, Birck Nanotechnology Center, Purdue University, West Lafayette, IN, USA
| | - Zhaxylyk Kudyshev
- School of Electrical and Computer Engineering, Birck Nanotechnology Center, Purdue University, West Lafayette, IN, USA
| | | | - Zubin Jacob
- School of Electrical and Computer Engineering, Birck Nanotechnology Center, Purdue University, West Lafayette, IN, USA
- Purdue Quantum Science and Engineering Institute, Purdue University, West Lafayette, IN, USA
| | - Vladimir M Shalaev
- School of Electrical and Computer Engineering, Birck Nanotechnology Center, Purdue University, West Lafayette, IN, USA
- Purdue Quantum Science and Engineering Institute, Purdue University, West Lafayette, IN, USA
| | - Alexander V Kildishev
- School of Electrical and Computer Engineering, Birck Nanotechnology Center, Purdue University, West Lafayette, IN, USA
- Purdue Quantum Science and Engineering Institute, Purdue University, West Lafayette, IN, USA
| | - Alexandra Boltasseva
- School of Electrical and Computer Engineering, Birck Nanotechnology Center, Purdue University, West Lafayette, IN, USA.
- Purdue Quantum Science and Engineering Institute, Purdue University, West Lafayette, IN, USA.
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17
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Chen X, Xue Y, Sun Y, Shen J, Song S, Zhu M, Song Z, Cheng Z, Zhou P. Neuromorphic Photonic Memory Devices Using Ultrafast, Non-Volatile Phase-Change Materials. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2023; 35:e2203909. [PMID: 35713563 DOI: 10.1002/adma.202203909] [Citation(s) in RCA: 10] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/30/2022] [Revised: 06/09/2022] [Indexed: 06/15/2023]
Abstract
The search for ultrafast photonic memory devices is inspired by the ever-increasing number of cloud-computing, supercomputing, and artificial-intelligence applications, together with the unique advantages of signal processing in the optical domain such as high speed, large bandwidth, and low energy consumption. By embracing silicon photonics with chalcogenide phase-change materials (PCMs), non-volatile integrated photonic memory is developed with promising potential in photonic integrated circuits and nanophotonic applications. While conventional PCMs suffer from slow crystallization speed, scandium-doped antimony telluride (SST) has been recently developed for ultrafast phase-change random-access memory applications. An ultrafast non-volatile photonic memory based on an SST thin film with a 2 ns write/erase speed is demonstrated, which is the fastest write/erase speed ever reported in integrated phase-change photonic devices. SST-based photonic memories exhibit multilevel capabilities and good stability at room temperature. By mapping the memory level to the biological synapse weight, an artificial neural network based on photonic memory devices is successfully established for image classification. Additionally, a reflective nanodisplay application using SST with optoelectronic modulation capabilities is demonstrated. Both the optical and electrical changes in SST during the phase transition and the fast-switching speed demonstrate their potential for use in photonic computing, neuromorphic computing, nanophotonics, and optoelectronic applications.
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Affiliation(s)
- Xiaozhang Chen
- State Key Laboratory of ASIC and System, Department of Microelectronics, Fudan University, Shanghai, 200433, P. R. China
| | - Yuan Xue
- State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai, 200050, P. R. China
| | - Yibo Sun
- State Key Laboratory of ASIC and System, Department of Microelectronics, Fudan University, Shanghai, 200433, P. R. China
| | - Jiabin Shen
- State Key Laboratory of ASIC and System, Department of Microelectronics, Fudan University, Shanghai, 200433, P. R. China
| | - Sannian Song
- State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai, 200050, P. R. China
| | - Min Zhu
- State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai, 200050, P. R. China
| | - Zhitang Song
- State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai, 200050, P. R. China
| | - Zengguang Cheng
- State Key Laboratory of ASIC and System, Department of Microelectronics, Fudan University, Shanghai, 200433, P. R. China
| | - Peng Zhou
- State Key Laboratory of ASIC and System, Department of Microelectronics, Fudan University, Shanghai, 200433, P. R. China
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18
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Gao Z, Wildenborg A, Kocoj CA, Liu E, Sheofsky C, Rawashdeh A, Qu H, Guo P, Suh JY, Yang A. Low-Loss Plasmonics with Nanostructured Potassium and Sodium-Potassium Liquid Alloys. NANO LETTERS 2023; 23:7150-7156. [PMID: 37477493 DOI: 10.1021/acs.nanolett.3c02054] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/22/2023]
Abstract
Alkali metals have low optical losses in the visible to near-infrared (NIR) compared with noble metals. However, their high reactivity prohibits the exploration of their optical properties. Recently sodium (Na) has been experimentally demonstrated as a low-loss plasmonic material. Here we report on a thermo-assisted nanoscale embossing (TANE) technique for fabricating plasmonic nanostructures from pure potassium (K) and NaK liquid alloys. We show high-quality-factor resonances from K as narrow as 15 nm in the NIR, which we attribute to the high material quality and low optical loss. We further demonstrate liquid Na-K plasmonics by exploiting the Na-K eutectic phase diagram. Our study expands the material library for alkali metal plasmonics and liquid plasmonics, potentially enabling a range of new material platforms for active metamaterials and photonic devices.
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Affiliation(s)
- Zhi Gao
- Department of Mechanical Engineering, Oakland University, Rochester, Michigan 48309, United States
| | - Aaron Wildenborg
- Department of Physics, Michigan Technological University, Houghton, Michigan 49931, United States
| | - Conrad A Kocoj
- Department of Chemical and Environmental Engineering, Yale University, New Haven, Connecticut 06520, United States
- Energy Sciences Institute, Yale University, West Haven, Connecticut 06516, United States
| | - Eric Liu
- Department of Mechanical Engineering, Oakland University, Rochester, Michigan 48309, United States
| | - Caden Sheofsky
- Department of Physics, Michigan Technological University, Houghton, Michigan 49931, United States
| | - Abdelsalam Rawashdeh
- Department of Mechanical Engineering, Oakland University, Rochester, Michigan 48309, United States
| | - Hongwei Qu
- Department of Electrical & Computer Engineering, Oakland University, Rochester, Michigan 48309, United States
| | - Peijun Guo
- Department of Chemical and Environmental Engineering, Yale University, New Haven, Connecticut 06520, United States
- Energy Sciences Institute, Yale University, West Haven, Connecticut 06516, United States
| | - Jae Yong Suh
- Department of Physics, Michigan Technological University, Houghton, Michigan 49931, United States
| | - Ankun Yang
- Department of Mechanical Engineering, Oakland University, Rochester, Michigan 48309, United States
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19
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Tang H, Stan L, Czaplewski DA, Yang X, Gao J. Wavelength-tunable infrared chiral metasurfaces with phase-change materials. OPTICS EXPRESS 2023; 31:21118-21127. [PMID: 37381219 DOI: 10.1364/oe.489841] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/16/2023] [Accepted: 05/11/2023] [Indexed: 06/30/2023]
Abstract
Optical phase-change materials exhibit tunable permittivity and switching properties during phase transition, which offers the possibility of dynamic control of optical devices. Here, a wavelength-tunable infrared chiral metasurface integrated with phase-change material GST-225 is demonstrated with the designed unit cell of parallelogram-shaped resonator. By varying the baking time at a temperature above the phase transition temperature of GST-225, the resonance wavelength of the chiral metasurface is tuned in the wavelength range of 2.33 µm to 2.58 µm, while the circular dichroism in absorption is maintained around 0.44. The chiroptical response of the designed metasurface is revealed by analyzing the electromagnetic field and displacement current distributions under left- and right-handed circularly polarized (LCP and RCP) light illumination. Moreover, the photothermal effect is simulated to investigate the large temperature difference in the chiral metasurface under LCP and RCP illumination, which allows for the possibility of circular polarization-controlled phase transition. The presented chiral metasurfaces with phase-change materials offer the potential to facilitate promising applications in the infrared regime, such as chiral thermal switching, infrared imaging, and tunable chiral photonics.
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20
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Zhao P, Ding X, Li C, Tang S. Achieving Photonic Spin Hall Effect, Spin-Selective Absorption, and Beam Deflection with a Vanadium Dioxide Metasurface. MATERIALS (BASEL, SWITZERLAND) 2023; 16:4259. [PMID: 37374442 DOI: 10.3390/ma16124259] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/07/2023] [Revised: 06/01/2023] [Accepted: 06/06/2023] [Indexed: 06/29/2023]
Abstract
Metasurface-based research with phase-change materials has been a prominent and rapidly developing research field that has drawn considerable attention in recent years. In this paper, we proposed a kind of tunable metasurface based on the simplest metal-insulator-metal structure, which can be realized by the mutual transformation of insulating and metallic states of vanadium dioxide (VO2) and can realize the functional switching of photonic spin Hall effect (PSHE), absorption and beam deflection at the same terahertz frequency. When VO2 is insulating, combined with the geometric phase, the metasurface can realize PSHE. A normal incident linear polarized wave will be split into two spin-polarized reflection beams traveling in two off-normal directions. When VO2 is in the metal state, the designed metasurface can be used as a wave absorber and a deflector, which will completely absorb LCP waves, while the reflected amplitude of RCP waves is 0.828 and deflects. Our design only consists of one layer of artificial structure with two materials and is easy to realize in the experiment compared with the metasurface of a multi-layer structure, which can provide new ideas for the research of tunable multifunctional metasurface.
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Affiliation(s)
- Pengfei Zhao
- School of Physical Science and Technology, Ningbo University, Ningbo 315211, China
| | - Xinyi Ding
- School of Physical Science and Technology, Ningbo University, Ningbo 315211, China
| | - Chuang Li
- School of Physical Science and Technology, Ningbo University, Ningbo 315211, China
| | - Shiwei Tang
- School of Physical Science and Technology, Ningbo University, Ningbo 315211, China
- State Key Laboratory of Surface Physics, Department of Physics, Fudan University, Shanghai 200433, China
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21
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Papas D, Ou JY, Plum E, Zheludev NI. Microwatt Volatile Optical Bistability via Nanomechanical Nonlinearity. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2023:e2300042. [PMID: 37186378 DOI: 10.1002/advs.202300042] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/03/2023] [Revised: 03/30/2023] [Indexed: 05/17/2023]
Abstract
Metastable optically controlled devices (optical flip-flops) are needed in data storage, signal processing, and displays. Although nonvolatile memory relying on phase transitions in chalcogenide glasses has been widely used for optical data storage, beyond that, weak optical nonlinearities have hindered the development of low-power bistable devices. This work reports a new type of volatile optical bistability in a hybrid nano-optomechanical device, comprising a pair of anchored nanowires decorated with plasmonic metamolecules. The nonlinearity and bistability reside in the mechanical properties of the acoustically driven nanowires and are transduced to the optical response by reconfiguring the plasmonic metamolecules. The device can be switched between bistable optical states with microwatts of optical power and its volatile memory can be erased by removing the acoustic signal. The demonstration of hybrid nano-optomechanical bistability opens new opportunities to develop low-power optical bistable devices.
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Affiliation(s)
- Dimitrios Papas
- Optoelectronics Research Centre and Centre for Photonic Metamaterials, University of Southampton, Highfield, Southampton, SO17 1BJ, UK
| | - Jun-Yu Ou
- Optoelectronics Research Centre and Centre for Photonic Metamaterials, University of Southampton, Highfield, Southampton, SO17 1BJ, UK
| | - Eric Plum
- Optoelectronics Research Centre and Centre for Photonic Metamaterials, University of Southampton, Highfield, Southampton, SO17 1BJ, UK
| | - Nikolay I Zheludev
- Optoelectronics Research Centre and Centre for Photonic Metamaterials, University of Southampton, Highfield, Southampton, SO17 1BJ, UK
- Centre for Disruptive Photonic Technologies, SPMS, TPI, Nanyang Technological University, Singapore, 637371, Singapore
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22
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Phase-change materials based on amorphous equichalcogenides. Sci Rep 2023; 13:2881. [PMID: 36801904 PMCID: PMC9938898 DOI: 10.1038/s41598-023-30160-7] [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: 12/23/2022] [Accepted: 02/16/2023] [Indexed: 02/20/2023] Open
Abstract
Phase-change materials, demonstrating a rapid switching between two distinct states with a sharp contrast in electrical, optical or magnetic properties, are vital for modern photonic and electronic devices. To date, this effect is observed in chalcogenide compounds based on Se, Te or both, and most recently in stoichiometric Sb2S3 composition. Yet, to achieve best integrability into modern photonics and electronics, the mixed S/Se/Te phase change medium is needed, which would allow a wide tuning range for such important physical properties as vitreous phase stability, radiation and photo-sensitivity, optical gap, electrical and thermal conductivity, non-linear optical effects, as well as the possibility of structural modification at nanoscale. In this work, a thermally-induced high-to-low resistivity switching below 200 °C is demonstrated in Sb-rich equichalcogenides (containing S, Se and Te in equal proportions). The nanoscale mechanism is associated with interchange between tetrahedral and octahedral coordination of Ge and Sb atoms, substitution of Te in the nearest Ge environment by S or Se, and Sb-Ge/Sb bonds formation upon further annealing. The material can be integrated into chalcogenide-based multifunctional platforms, neuromorphic computational systems, photonic devices and sensors.
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23
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Wang M, Lee JS, Aggarwal S, Farmakidis N, He Y, Cheng T, Bhaskaran H. Varifocal Metalens Using Tunable and Ultralow-loss Dielectrics. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2023; 10:e2204899. [PMID: 36596668 PMCID: PMC9951390 DOI: 10.1002/advs.202204899] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/30/2022] [Revised: 12/07/2022] [Indexed: 05/25/2023]
Abstract
The field of flat optics that uses nanostructured, so-called metasurfaces, has seen remarkable progress over the last decade. Chalcogenide phase-change materials (PCMs) offer a promising platform for realizing reconfigurable metasurfaces, as their optical properties can be reversibly tuned. Yet, demonstrations of phase-change metalenses to date have employed material compositions such as Ge2 Sb2 Te5 , which show high absorption in the visible to near-IR wavelengths particularly in their crystalline state, limiting the applicability. Here, by using a low-loss PCM Sb2 Se3 , for the first time, active polarization-insensitive phase-change metalenses at near-IR wavelengths with comparable efficiencies in both material states are shown. An active metalens with a tunable focusing intensity of 95% and a focusing efficiency of 23% is demonstrated. A varifocal metalens is then demonstrated with a tunable focal length from 41 to 123 µm with comparable focusing efficiency (5.7% and 3%). The ultralow-loss nature of the material introduces exciting new possibilities for optical communications, multi-depth imaging, beam steering, optical routing, and holography.
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Affiliation(s)
- Mengyun Wang
- Department of MaterialsUniversity of OxfordOxfordOX1 3PHUK
| | - June Sang Lee
- Department of MaterialsUniversity of OxfordOxfordOX1 3PHUK
| | | | | | - Yuhan He
- Department of MaterialsUniversity of OxfordOxfordOX1 3PHUK
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24
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Quan C, Gu S, Zou J, Guo C, Xu W, Zhu Z, Zhang J. Phase change metamaterial for tunable infrared stealth and camouflage. OPTICS EXPRESS 2022; 30:43741-43751. [PMID: 36523066 DOI: 10.1364/oe.478302] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/16/2022] [Accepted: 10/30/2022] [Indexed: 06/17/2023]
Abstract
In the paper, a type of phase change metamaterial for tunable infrared stealth and camouflage is proposed and numerically studied. The metamaterial combines high temperature resistant metal Mo with phase-changing material GST and can be switched between the infrared "stealthy" and "non-stealthy" states through the phase change process of the GST. At the amorphous state of GST, there is a high absorption peak at the atmospheric absorption spectral range, which can achieve infrared stealth in the atmospheric window together with good radiative heat dissipation in the non-atmospheric window. While at the crystalline state of GST, the absorption peak becomes broader and exhibits high absorption in the long-wave infrared atmospheric window, leading to a "non-stealthy" state. The relationship between the infrared stealth performance of the structure with the polarization and incident angle of the incident light is also studied in detail. The proposed infrared stealth metamaterial employs a simple multilayer structure and could be fabricated in large scale. Our work will promote the research of dynamically tunable, large scale phase change metamaterials for infrared stealth as well as energy and other applications.
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25
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Kim M, Rehman MA, Lee D, Wang Y, Lim DH, Khan MF, Choi H, Shao QY, Suh J, Lee HS, Park HH. Filamentary and Interface-Type Memristors Based on Tantalum Oxide for Energy-Efficient Neuromorphic Hardware. ACS APPLIED MATERIALS & INTERFACES 2022; 14:44561-44571. [PMID: 36164762 DOI: 10.1021/acsami.2c12296] [Citation(s) in RCA: 14] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
To implement artificial neural networks (ANNs) based on memristor devices, it is essential to secure the linearity and symmetry in weight update characteristics of the memristor, and reliability in the cycle-to-cycle and device-to-device variations. This study experimentally demonstrated and compared the filamentary and interface-type resistive switching (RS) behaviors of tantalum oxide (Ta2O5 and TaO2)-based devices grown by atomic layer deposition (ALD) to propose a suitable RS type in terms of reliability and weight update characteristics. Although Ta2O5 is a strong candidate for memristor, the filament-type RS behavior of Ta2O5 does not fit well with ANNs demanding analog memory characteristics. Therefore, this study newly designed an interface-type TaO2 memristor and compared it to a filament type of Ta2O5 memristor to secure the weight update characteristics and reliability. The TaO2-based interface-type memristor exhibited gradual RS characteristics and area dependency in both high- and low-resistance states. In addition, compared to the filamentary memristor, the RS behaviors of the TaO2-based interface-type device exhibited higher suitability for the neuromorphic, symmetric, and linear long-term potentiation (LTP) and long-term depression (LTD). These findings suggest better types of memristors for implementing ionic memristor-based ANNs among the two types of RS mechanisms.
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Affiliation(s)
- Minjae Kim
- Department of Materials Science and Engineering, Yonsei University, Seoul 03722, South Korea
| | - Malik Abdul Rehman
- Department of Materials Science and Engineering, Yonsei University, Seoul 03722, South Korea
| | - Donghyun Lee
- Department of Materials Science and Engineering, Ulsan National Institute of Science and Technology, Ulsan 44919, Korea
| | - Yue Wang
- Department of Materials Science and Engineering, Yonsei University, Seoul 03722, South Korea
| | - Dong-Hyeok Lim
- Department of Materials Science and Engineering, Ulsan National Institute of Science and Technology, Ulsan 44919, Korea
| | - Muhammad Farooq Khan
- Department of Electrical Engineering, Sejong University, Seoul 05006, South Korea
| | - Haryeong Choi
- Department of Materials Science and Engineering, Yonsei University, Seoul 03722, South Korea
| | - Qing Yi Shao
- Provincial Key Laboratory of Nuclear Science, Institute of Quantum Matter, South China Normal University, Guangzhou 510006, China
| | - Joonki Suh
- Department of Materials Science and Engineering, Ulsan National Institute of Science and Technology, Ulsan 44919, Korea
| | - Hong-Sub Lee
- Department of Advanced Materials Engineering for Information and Electronics, Kyung Hee University, Yongin, Gyeonggi-do 17104, Korea
| | - Hyung-Ho Park
- Department of Materials Science and Engineering, Yonsei University, Seoul 03722, South Korea
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26
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Wu H, Han W, Zhang X. Ultrafast Dynamics of Different Phase States Ge 2Sb 2Te 5 Film Induced by a Femtosecond Laser Pulse Irradiation. MATERIALS (BASEL, SWITZERLAND) 2022; 15:6760. [PMID: 36234103 PMCID: PMC9572123 DOI: 10.3390/ma15196760] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/30/2022] [Revised: 09/18/2022] [Accepted: 09/21/2022] [Indexed: 06/16/2023]
Abstract
A femtosecond laser could realize a high transition rate of the phase change material (PCM), and the properties of the amorphous and the crystalline Ge2Sb2Te5 (GST) induced by a femtosecond laser were studied, which was one of the candidates among the PCMs. However, the characteristics of the intermediate phase states in reversible phase transitions were also important and helpful to explore the mechanisms of the phase transitions. In this paper, the ultrafast dynamics of amorphous, crystalline face-centered-cubic (FCC), and hexagonal-close-packed (HCP) states were investigated using a femtosecond laser pulse excitation through a reflective-type pump-probe technique, obtained by annealing at certain temperatures, and verified using X-ray diffraction (XRD) and the Raman spectrum. It was found that as the annealing temperature increased, the electron of the GST films could be excited more easily, while the ablation threshold decreased. Due to annealing, the structure of bonding was changed for different phase states, which resulted in the decrease in the band gap of the films. In addition, it was hard for the intermediate state films to transit to the amorphous structure state via the femtosecond laser, and the crystallization would be enhanced, while the crystalline HCP structures of GST could be directly and easily changed to the amorphous state by a pulse, which resulted from the non-thermal phase change caused by the excited electron.
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Affiliation(s)
- Hao Wu
- Laser Micro/Nano-Fabrication Laboratory, School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, China
- Beijing Institute of Technology Chongqing Innovation Center, Chongqing 401120, China
| | - Weina Han
- Laser Micro/Nano-Fabrication Laboratory, School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, China
- Beijing Institute of Technology Chongqing Innovation Center, Chongqing 401120, China
| | - Xiaobin Zhang
- Laser Micro/Nano-Fabrication Laboratory, School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, China
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27
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Bowei X, Wenjie Z, Junming Z, Linhua L. VO 2-based superposed Fabry-Perot multilayer film with a highly enhanced infrared emittance and emittance tunability for spacecraft thermal control. OPTICS EXPRESS 2022; 30:34314-34327. [PMID: 36242446 DOI: 10.1364/oe.464266] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/18/2022] [Accepted: 08/25/2022] [Indexed: 06/16/2023]
Abstract
Thermal control coating for spacecraft based on thermochromic film attracts increasing interest due to their ability of self-adaptive emittance switch and less resource consuming compared with traditional thermal control coatings. However, practical applications of thermochromic film for spacecraft are constrained by the low infrared emittance at a high temperature and narrow emittance tunability. In this work, a thermochromic film with simple structure, nearly perfect infrared emission and large emittance tunability is proposed for the application of spacecraft thermal control. The thermochromic film is a VO2-based superposed Fabry-Perot (FP) multilayer film, which is constructed by encapsulating three thin VO2 layers in four lossless BaF2 spacer on the Al substrate. The infrared emittance and emittance tunability of the superposed FP film is dramatically enhanced by the three superposed VO2-BaF2-Al FP resonances at wavelengths of 9, 15 and 20 µm, respectively. For VO2 layers under metallic state, the spectral normal emittance of the superposed FP film is close to unity in the entire mid-infrared spectral range, while for VO2 layers under dielectric state, the film is highly reflective. For the typical growth techniques of the VO2 layers considered here, the emittance tunability of the superposed FP film can exceed 0.70 with total normal emittance larger than 0.91 at high temperature, simultaneously. The largest total normal emittance of the superposed FP film can reach 0.95 with emittance tunability of 0.78. In addition, the infrared emission and emittance tunability performances of the superposed FP film remain excellent for incident angles up to 60°. This work proposes a simple structure with highly enhanced infrared emittance and emittance tunability that outperforms the existing thermochromic films, which could accelerate the application of thermochromic films in the field of spacecraft thermal control.
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28
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Liu Y, Ding H, Li J, Lou X, Yang M, Zheng Y. Light-driven single-cell rotational adhesion frequency assay. ELIGHT 2022; 2:13. [PMID: 35965781 DOI: 10.1186/s43593-022-00013-3] [Citation(s) in RCA: 56] [Impact Index Per Article: 28.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/24/2022] [Revised: 06/28/2022] [Accepted: 07/07/2022] [Indexed: 05/23/2023]
Abstract
UNLABELLED The interaction between cell surface receptors and extracellular ligands is highly related to many physiological processes in living systems. Many techniques have been developed to measure the ligand-receptor binding kinetics at the single-cell level. However, few techniques can measure the physiologically relevant shear binding affinity over a single cell in the clinical environment. Here, we develop a new optical technique, termed single-cell rotational adhesion frequency assay (scRAFA), that mimics in vivo cell adhesion to achieve label-free determination of both homogeneous and heterogeneous binding kinetics of targeted cells at the subcellular level. Moreover, the scRAFA is also applicable to analyze the binding affinities on a single cell in native human biofluids. With its superior performance and general applicability, scRAFA is expected to find applications in study of the spatial organization of cell surface receptors and diagnosis of infectious diseases. SUPPLEMENTARY INFORMATION The online version contains supplementary material available at 10.1186/s43593-022-00020-4.
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Affiliation(s)
- Yaoran Liu
- Department of Electrical and Computer Engineering, The University of Texas at Austin, Austin, TX 78712 USA
| | - Hongru Ding
- Walker Department of Mechanical Engineering, The University of Texas at Austin, Austin, TX 78712 USA
| | - Jingang Li
- Materials Science & Engineering Program and Texas Materials Institute, The University of Texas at Austin, Austin, TX 78712 USA
| | - Xin Lou
- School of Physical Sciences, University of Chinese Academy of Sciences, Beijing, 100049 China
| | - Mingcheng Yang
- School of Physical Sciences, University of Chinese Academy of Sciences, Beijing, 100049 China
- Beijing National Laboratory for Condensed Matter Physics and Laboratory of Soft Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, 100190 China
- Songshan Lake Materials Laboratory, Dongguan, 523808 Guangdong China
| | - Yuebing Zheng
- Department of Electrical and Computer Engineering, The University of Texas at Austin, Austin, TX 78712 USA
- Walker Department of Mechanical Engineering, The University of Texas at Austin, Austin, TX 78712 USA
- Materials Science & Engineering Program and Texas Materials Institute, The University of Texas at Austin, Austin, TX 78712 USA
- Department of Biomedical Engineering, The University of Texas at Austin, Austin, TX 78712 USA
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29
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Zhang S, Chen X, Liu K, Li H, Lang Y, Han J, Wang Q, Lu Y, Dai J, Cao T, Tian Z. Terahertz multi-level nonvolatile optically rewritable encryption memory based on chalcogenide phase-change materials. iScience 2022; 25:104866. [PMID: 35996583 PMCID: PMC9391584 DOI: 10.1016/j.isci.2022.104866] [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: 03/10/2022] [Revised: 06/28/2022] [Accepted: 07/27/2022] [Indexed: 11/09/2022] Open
Abstract
Fast and efficient information processing and encryption, including writing, reading, and encryption memory, is essential for upcoming terahertz (THz) communications and information encryption. Here, we demonstrate a THz multi-level, nonvolatile, optically rewritable memory and encryption memory based on chalcogenide phase-change materials, Ge2Sb2Te5 (GST). By tuning the laser fluence irradiated on GST, we experimentally achieve multiple intermediate states and large-area amorphization with a diameter of centimeter-level in the THz regime. Our memory unit features a high operating speed of up to 4 ns, excellent reproducibility, and long-term stability. Utilizing this approach, hexadecimal coding information memories are implemented, and multiple writing-erasing tests are successfully carried out in the same active area. Finally, terahertz photoprint memory is demonstrated, verifying the feasibility of lithography-free devices. The demonstration suggests a practical way to protect and store information and paves a new avenue toward nonvolatile active THz devices. Multiple intermediate states and large-area amorphization of GST in the THz regime 4-ns operating speed, excellent reproducibility, and long-term stability Multiple writing-erasing tests on hexadecimal coding information memories THz photoprint memory and encryption memory
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30
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Peng K, Huang Y, Jiang H, Cui Y, Zhang H, Jiang Y, Zhao W. Enhanced circular dichroism in Ge 2Sb 2Te 5-loaded metasurface. OPTICS EXPRESS 2022; 30:29022-29029. [PMID: 36299087 DOI: 10.1364/oe.466018] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/06/2022] [Accepted: 07/12/2022] [Indexed: 06/16/2023]
Abstract
Circular dichroism (CD) is originally obtained from three-dimensional spiral structures by simultaneously exciting electric and magnetic resonances. To simplify construction, multilayer stacked asymmetric structures and the symmetric structures relying on oblique incidence are proposed for enhancing CD. Herein, we achieved the enhancement of dual-waveband CD by adding a Ge2Sb2Te5 (GST) layer on the top of a Z-shape gold array in a normally incident system. Benefited from the polarization selective excitations of electric and magnetic dipole resonances, the CD in a simple planar structure is immensely enhanced from near zero to 0.73 at 1.58 µm. Furthermore, the CD strengths is dynamically tuned by controlling the phase of GST. With the GST phase transition from amorphous (a-GST) to crystalline state (c-GST), CD magnitudes are switched by about 0.73 and 0.27 at dual wavebands respectively. The enhancement of CD by adding a layer on a simple planar array offers a new method for designing planar metasurfaces with strong chirality.
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31
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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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32
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Reflective Terahertz Metasurfaces Based on Non-Volatile Phase Change Material for Switchable Manipulation. PHOTONICS 2022. [DOI: 10.3390/photonics9080508] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
Recently, metasurfaces have been investigated and exploited for various applications in the THz regime, including modulators and detectors. However, the responsive properties of the metasurface in THz stay fixed once the fabrication process is complete. This limitation can be modified when integrating the phase change material (PCM), whose states are switchable between crystalline and amorphous, into the metasurface structure. This characteristic of the PCM is appealing in achieving dynamic and customizable functionality. In this work, the reflective metasurface structure is designed as a hexagonal unit deposited on a polyimide substrate. The non-volatile PCM chosen for the numerical study is germanium antimony tellurium (GST). Our proposed phase change metasurface provides two resonant frequencies located at 1.72 and 2.70 THz, respectively; one of them shows a high contrast of reflectivity at almost 80%. The effects of geometrical parameters, incident angles, and polarization modes on the properties of the proposed structure are explored. Finally, the performances of the structure are evaluated in terms of the insertion loss and extinction ratio.
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33
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Ghindani D, Issah I, Chervinskii S, Lahikainen M, Kuntze K, Priimagi A, Caglayan H. Humidity-Controlled Tunable Emission in a Dye-Incorporated Metal-Hydrogel-Metal Cavity. ACS PHOTONICS 2022; 9:2287-2294. [PMID: 35880073 PMCID: PMC9305995 DOI: 10.1021/acsphotonics.2c00202] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Actively controllable photoluminescence is potent for a wide variety of applications from biosensing and imaging to optoelectronic components. Traditionally, methods to achieve active emission control are limited due to complex fabrication processes or irreversible tuning. Here, we demonstrate active emission tuning, achieved by changing the ambient humidity in a fluorescent dye-containing hydrogel integrated into a metal-insulator-metal (MIM) system. Altering the overlapping region of the MIM cavity resonance and the absorption and emission spectra of the dye used is the underlying principle to achieving tunability of the emission. We first verify this by passive tuning of cavity resonance and further experimentally demonstrate active tuning in both air and aqueous environments. The proposed approach is reversible, easy to integrate, and spectrally scalable, thus providing opportunities for developing tunable photonic devices.
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34
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Kumar B, Paul A, Mondal DJ, Paliwal P, Konar S. Spin-State Modulation in Fe II -Based Hofmann-Type Coordination Polymers: From Molecules to Materials. CHEM REC 2022; 22:e202200135. [PMID: 35815939 DOI: 10.1002/tcr.202200135] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2022] [Revised: 06/21/2022] [Indexed: 11/05/2022]
Abstract
Spin crossover complexes that reversibly interconvert between two stable states imitate a binary state of 0 and 1, delivering a promising possibility to address the data processing concept in smart materials. Thus, a comprehensive understanding of the modulation of magnetic transition between high spin and low spin and the factors responsible for stabilizing the spin states is an essential theme in modern materials design. In this context, the present review attempts to provide a concise outline of the design strategy employed at the molecular level for fine-tuning the spin-state switching in FeII -based Hofmann-type coordination polymers and their effects on the optical and magnetic response. In addition, development towards the nanoscale architectures of HCPs, i. e., in terms of nanoparticles and thin films, are emphasized to bridge the gap between the laboratory and reality.
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Affiliation(s)
- Bhart Kumar
- Molecular Magnetism Lab, Department of Chemistry, Indian Institute of Science Education and Research, Bhopal, Bhopal Bypass Road, Bhopal, Madhya Pradesh, 462066, India
| | - Abhik Paul
- Molecular Magnetism Lab, Department of Chemistry, Indian Institute of Science Education and Research, Bhopal, Bhopal Bypass Road, Bhopal, Madhya Pradesh, 462066, India
| | - Dibya Jyoti Mondal
- Molecular Magnetism Lab, Department of Chemistry, Indian Institute of Science Education and Research, Bhopal, Bhopal Bypass Road, Bhopal, Madhya Pradesh, 462066, India
| | - Piyush Paliwal
- Molecular Magnetism Lab, Department of Chemistry, Indian Institute of Science Education and Research, Bhopal, Bhopal Bypass Road, Bhopal, Madhya Pradesh, 462066, India
| | - Sanjit Konar
- Molecular Magnetism Lab, Department of Chemistry, Indian Institute of Science Education and Research, Bhopal, Bhopal Bypass Road, Bhopal, Madhya Pradesh, 462066, India
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35
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Luo M, Li X, Zhang Z, Ma H, Du T, Jiang X, Zhang Z, Yang J. Tunable Infrared Detection, Radiative Cooling and Infrared-Laser Compatible Camouflage Based on a Multifunctional Nanostructure with Phase-Change Material. NANOMATERIALS 2022; 12:nano12132261. [PMID: 35808095 PMCID: PMC9268176 DOI: 10.3390/nano12132261] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/30/2022] [Revised: 06/25/2022] [Accepted: 06/28/2022] [Indexed: 02/04/2023]
Abstract
The nanostructure composed of nanomaterials and subwavelength units offers flexible design freedom and outstanding advantages over conventional devices. In this paper, a multifunctional nanostructure with phase-change material (PCM) is proposed to achieve tunable infrared detection, radiation cooling and infrared (IR)-laser compatible camouflage. The structure is very simple and is modified from the classic metal-dielectric-metal (MIM) multilayer film structure. We innovatively composed the top layer of metals with slits, and introduced a non-volatile PCM Ge2Sb2Te5 (GST) for selective absorption/radiation regulation. According to the simulation results, wide-angle and polarization-insensitive dual-band infrared detection is realized in the four-layer structure. The transformation from infrared detection to infrared stealth is realized in the five-layer structure, and laser stealth is realized in the atmospheric window by electromagnetic absorption. Moreover, better radiation cooling is realized in the non-atmospheric window. The proposed device can achieve more than a 50% laser absorption rate at 10.6 μm while ensuring an average infrared emissivity below 20%. Compared with previous works, our proposed multifunctional nanostructures can realize multiple applications with a compact structure only by changing the temperature. Such ultra-thin, integratable and multifunctional nanostructures have great application prospects extending to various fields such as electromagnetic shielding, optical communication and sensing.
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Affiliation(s)
- Mingyu Luo
- Guangxi Key Laboratory of Multimedia Communications and Network Technology, School of Computer, Electronics and Information, Guangxi University, Nanning 530004, China;
- Center of Material Science, College of Liberal Arts and Sciences, National University of Defense Technology, Changsha 410073, China; (X.L.); (Z.Z.); (H.M.); (T.D.); (X.J.)
| | - Xin Li
- Center of Material Science, College of Liberal Arts and Sciences, National University of Defense Technology, Changsha 410073, China; (X.L.); (Z.Z.); (H.M.); (T.D.); (X.J.)
| | - Zhaojian Zhang
- Center of Material Science, College of Liberal Arts and Sciences, National University of Defense Technology, Changsha 410073, China; (X.L.); (Z.Z.); (H.M.); (T.D.); (X.J.)
| | - Hansi Ma
- Center of Material Science, College of Liberal Arts and Sciences, National University of Defense Technology, Changsha 410073, China; (X.L.); (Z.Z.); (H.M.); (T.D.); (X.J.)
| | - Te Du
- Center of Material Science, College of Liberal Arts and Sciences, National University of Defense Technology, Changsha 410073, China; (X.L.); (Z.Z.); (H.M.); (T.D.); (X.J.)
| | - Xinpeng Jiang
- Center of Material Science, College of Liberal Arts and Sciences, National University of Defense Technology, Changsha 410073, China; (X.L.); (Z.Z.); (H.M.); (T.D.); (X.J.)
| | - Zhenrong Zhang
- Guangxi Key Laboratory of Multimedia Communications and Network Technology, School of Computer, Electronics and Information, Guangxi University, Nanning 530004, China;
- Correspondence: (Z.Z.); (J.Y.)
| | - Junbo Yang
- Center of Material Science, College of Liberal Arts and Sciences, National University of Defense Technology, Changsha 410073, China; (X.L.); (Z.Z.); (H.M.); (T.D.); (X.J.)
- Correspondence: (Z.Z.); (J.Y.)
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36
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Beam steering at the nanosecond time scale with an atomically thin reflector. Nat Commun 2022; 13:3431. [PMID: 35701395 PMCID: PMC9198240 DOI: 10.1038/s41467-022-29976-0] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2022] [Accepted: 03/11/2022] [Indexed: 01/22/2023] Open
Abstract
Techniques to mold the flow of light on subwavelength scales enable fundamentally new optical systems and device applications. The realization of programmable, active optical systems with fast, tunable components is among the outstanding challenges in the field. Here, we experimentally demonstrate a few-pixel beam steering device based on electrostatic gate control of excitons in an atomically thin semiconductor with strong light-matter interactions. By combining the high reflectivity of a MoSe2 monolayer with a graphene split-gate geometry, we shape the wavefront phase profile to achieve continuously tunable beam deflection with a range of 10°, two-dimensional beam steering, and switching times down to 1.6 nanoseconds. Our approach opens the door for a new class of atomically thin optical systems, such as rapidly switchable beam arrays and quantum metasurfaces operating at their fundamental thickness limit. Andersen et al. have demonstrated a new type of beam steering device based on the excitonic response of an atomically thin semiconductor. Using electrostatic gates, the authors achieved tunable steering with switching times on the nanosecond scale.
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37
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Zhang H, Peng K, Jiang H, Li W, Zhao W. Multifunctional metasurfaces for switchable polarization selectivity and absorption. OPTICS EXPRESS 2022; 30:20554-20563. [PMID: 36224797 DOI: 10.1364/oe.457253] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/28/2022] [Accepted: 05/13/2022] [Indexed: 06/16/2023]
Abstract
A multifunctional metasurface capable of dynamic control for polarization selectivity and absorption is proposed by controlling the phase of Ge2Sb2Te5 (GST) in the near-infrared region. At amorphous state of GST (a-GST), the proposed GST strip array realized polarization selectivity in transmission-reflection integrated modes. The high-efficiency asymmetric transmission (AT = 0.92) and asymmetric reflection (AR = -0.82) are both obtained by selectively exciting Mie multipole resonances. With the transition from a-GST to crystalline (c-GST) state, the giant polarization selectivity almost disappeared, and the absorptions climb from < 0.1 to > 0.9. The maximum modulation depth reaches 94%. The mechanism of the dynamic switching between polarization selectivity and absorption is quantitively analyzed via multipole expansion. The GST based metasurfaces simultaneously possess excellent switchable capability for AT, AR, and absorption without refabricating structures, which is promising to the applications for next generation optical devices.
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38
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Dong B, Zhao R, Wei Q, Lu X, Huang W, Wang J, Ma H, Huang L. Terahertz switchable VO 2-Au hybrid active metasurface holographic encryption. OPTICS EXPRESS 2022; 30:20750-20761. [PMID: 36224812 DOI: 10.1364/oe.461424] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/20/2022] [Accepted: 05/16/2022] [Indexed: 06/16/2023]
Abstract
The combination of metasurface and holographic technology is the most cutting-edge development, but most of the proposed designs are static and do not allow active changes through external stimulation after fabrication, which takes only a limited part of the advantage provided by metasurface. Here, we propose and demonstrate a switchable hybrid active metasurface hologram in the terahertz (THz) regime composed of dynamic pixels (VO2-CSRR) and static pixels (Au-CSRR) based on an intelligent algorithm, which can display some/all information in different temperature ranges. In particular, such performance shows excellent potential in the field of optical communication security, making it a promising candidate. To prove this possibility, we propose a scheme for optical information encryption/decryption and transmission, which takes metasurfaces as carriers of encrypted information and state/polarization/positions as the secret key components. Only when the two matches correctly can we get the hidden real information. The security of our proposed scheme has reached an unprecedented level, providing a new road for communication security.
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All-optical switching based on plasmon-induced Enhancement of Index of Refraction. Nat Commun 2022; 13:3114. [PMID: 35662246 PMCID: PMC9166808 DOI: 10.1038/s41467-022-30750-5] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2021] [Accepted: 05/12/2022] [Indexed: 12/15/2022] Open
Abstract
In quantum optical Enhancement of Index of Refraction (EIR), coherence and quantum interference render the atomic systems to exhibit orders of magnitude higher susceptibilities with vanishing or even negative absorption at their resonances. Here we show the plasmonic analogue of the quantum optical EIR effect in an optical system and further implement this in a linear all-optical switching mechanism. We realize plasmon-induced EIR using a particular plasmonic metasurface consisting of a square array of L-shaped meta-molecules. In contrast to the conventional methods, this approach provides a scheme to modulate the amplitude of incident signals by coherent control of absorption without implementing gain materials or nonlinear processes. Therefore, light is controlled by applying ultra-low intensity at the extreme levels of spatiotemporal localization. In the pursuit of potential applications of linear all-optical switching devices, this scheme may introduce an effective tool for improving the modulation strength of optical modulators and switches through the amplification of input signals at ultra-low power.
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Abstract
With the continuous miniaturization of conventional integrated circuits, obstacles such as excessive cost, increased resistance to electronic motion, and increased energy consumption are gradually slowing down the development of electrical computing and constraining the application of deep learning. Optical neuromorphic computing presents various opportunities and challenges compared with the realm of electronics. Algorithms running on optical hardware have the potential to meet the growing computational demands of deep learning and artificial intelligence. Here, we review the development of optical neural networks and compare various research proposals. We focus on fiber-based neural networks. Finally, we describe some new research directions and challenges.
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41
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He Q, Liu Z, Lu Y, Ban G, Tong H, Wang Y, Miao X. Low-loss ultrafast and non-volatile all-optical switch enabled by all-dielectric phase change materials. iScience 2022; 25:104375. [PMID: 35620422 PMCID: PMC9126764 DOI: 10.1016/j.isci.2022.104375] [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: 01/28/2022] [Revised: 04/15/2022] [Accepted: 05/04/2022] [Indexed: 11/30/2022] Open
Abstract
All-optical switches show great potential to overcome the speed and power consumption limitations of electrical switching. Owing to its nonvolatile and superb cycle abilities, phase-change materials enabled all-optical switch (PC-AOS) is attracting much attention. However, realizing low-loss and ultrafast switching remains a challenge, because previous PC-AOS are mostly based on plasmonic metamaterials. The high thermal conductance of metallic materials disturbs the thermal accumulation for phase transition, and eventually decreases the switching speed to tens of nanoseconds. Here, we demonstrate an ultrafast switching (4.5 ps) and low-loss (2.8 dB) all-optical switch based on all-dielectric structure consisting of Ge2Sb2Te5 and photonic crystals. Its switching speed is approximately ten thousand times faster than the plasmonic one. A 5.4 dB on-off ratio at 1550 nm has been experimentally achieved. We believe that the proposed all-dielectric optical switch will accelerate the progress of ultrafast and energy-efficient photonic devices and systems. All-dielectric phase change materials are used to achieve low loss all optical switch Only 15 nm phase change film is used for laser induced ultrafast switching Up to 7.4 dB switching contrast can be realized in the Near Infrared Spectrum Nano-hole array metasurface enables polarization insensitive optical filtering
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42
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Sakda N, Ghosh S, Chitaree R, Rahman BMA. Performance optimization of a metasurface incorporating non-volatile phase change material. OPTICS EXPRESS 2022; 30:12982-12994. [PMID: 35472922 DOI: 10.1364/oe.453612] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/11/2022] [Accepted: 03/24/2022] [Indexed: 06/14/2023]
Abstract
Optical metasurface is a combination of manufactured periodic patterns of many artificial nanostructured unit cells, which can provide unique and attractive optical and electrical properties. Additionally, the function of the metasurface can be altered by adjusting the metasurface's size and configuration to satisfy a particular required property. However, once it is fabricated, such specific property is fixed and cannot be changed. Here, phase change material (PCM) can play an important role due to its two distinct states during the phase transition, referred to as amorphous and crystalline states, which exhibit significantly different refractive indices, particularly in the infrared wavelength. Therefore, a combination of metasurface with a phase change material may be attractive for achieving agile and tunable functions. In this paper, we numerically investigate an array of silicon cylinders with a thin PCM layer at their centers. The GST and GSST are the most well-known PCMs and were chosen for this study due to their non-volatile properties. This structure produces two resonant modes, magnetic dipole and electric dipole, at two different resonating wavelengths. We have numerically simulated the effect of cylinder's height and diameter on the reflecting profile, including the effect of thickness of the phase change material. Additionally, it is shown here that a superior performance can be achieved towards reduced insertion loss, enhanced extinction ratio, and increased figure of merit when a GST layer is replaced by a GSST layer.
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Kaur S, Karmakar S, Jana A, Rane S, Varshney RK, Roy Chowdhury D. Hybrid resonant cavities: A route towards phase engineered THz metasurfaces. iScience 2022; 25:104024. [PMID: 35310941 PMCID: PMC8931363 DOI: 10.1016/j.isci.2022.104024] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2021] [Revised: 01/10/2022] [Accepted: 03/01/2022] [Indexed: 11/15/2022] Open
Affiliation(s)
- Sukhvinder Kaur
- Department of Physics, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110016, India
| | - Subhajit Karmakar
- Department of Physics, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110016, India
| | - Arun Jana
- Department of Physics, Ecole Centrale School of Engineering - Mahindra University, Jeedimetla, Hyderabad, Telangana 500043, India
| | - Shreeya Rane
- Department of Physics, Ecole Centrale School of Engineering - Mahindra University, Jeedimetla, Hyderabad, Telangana 500043, India
| | - Ravendra Kumar Varshney
- Department of Physics, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110016, India
| | - Dibakar Roy Chowdhury
- Department of Physics, Ecole Centrale School of Engineering - Mahindra University, Jeedimetla, Hyderabad, Telangana 500043, India
- Corresponding author
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44
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Jiang H, Peng K, Cui Y, Zhong J, Zhang H, Jiang Y, Zhao W. Design and simulation of a GST-based metasurface with strong and switchable circular dichroism. OPTICS LETTERS 2022; 47:1907-1910. [PMID: 35363766 DOI: 10.1364/ol.448177] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/12/2021] [Accepted: 02/18/2022] [Indexed: 06/14/2023]
Abstract
Circular dichroism (CD) is required in the applications of biological detection, analytical chemistry, etc. Here, we numerically demonstrated large-range switchable CD by controlling the phase change of Ge2Sb2Te5 (GST) in a zigzag array. At the amorphous state of GST (a-GST), the strong and dual-waveband CD effects are realized via the selective excitations of electric, magnetic, and toroidal resonances. With the transition from a-GST to crystalline state GST, CD strengths are tailored dynamically in large ranges. In detail, the CD magnitudes change by about 0.93 and the modulation depths exceed 94% at dual wavebands. The strong CD effects and large-range switch capability in the GST-based metasurfaces will boost the development of active chiroptical devices.
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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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46
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Abstract
The combination of the integrated waveguide and phase-change materials (PCMs) provides a promising platform for reconfigurable and multifunctional photoelectric devices. Through plasmonic enhancement and the low loss propagation of the waveguide, the footprint and power consumption of the photoelectric device can be effectively improved. In this work, a metal double-ring structure embedded with phase change materials was proposed to utilize the plasmonic effect for enhancement of the light-matter interaction. In particular, the overall temperature difference in the PCM cell can be confined within 2 °C during the crystallization process, thus avoiding the interior heterogeneous crystallization. The insertion loss of the cell in amorphous and crystalline states at a wavelength of 1550 nm are 2.3 dB and 1.0 dB, respectively. A signal contrast ratio of 15.8% is achieved under the ultra-small footprint (50 × 90 nm2) at a wavelength of 1550 nm.
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47
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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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48
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Non-Volatile Programmable Ultra-Small Photonic Arbitrary Power Splitters. NANOMATERIALS 2022; 12:nano12040669. [PMID: 35214997 PMCID: PMC8878045 DOI: 10.3390/nano12040669] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/17/2021] [Revised: 02/10/2022] [Accepted: 02/14/2022] [Indexed: 02/06/2023]
Abstract
A series of reconfigurable compact photonic arbitrary power splitters are proposed based on the hybrid structure of silicon and Ge2Sb2Se4Te1 (GSST), which is a new kind of non-volatile optical phase change material (O-PCM) with low absorption. Our pixelated meta-hybrid has an extremely small photonic integrated circuit (PIC) footprint with a size comparable to that of the most advanced electronic integrated circuits (EICs). The power-split ratio can be reconfigured in a completely digital manner through the amorphous and crystalline switching of the GSST material, which only coated less than one-fifth of the pattern allocation area. The target power–split ratio between the output channels can be arbitrarily reconfigured digitally with high precision and in the valuable C-band (1530–1560 nm) based on the analysis of three-dimensional finite-difference time-domain. The 1 × 2, 1 × 3, and 1 × 4 splitting configurations were all investigated with a variety of power–split ratios for each case, and the corresponding true value tables of GSST distribution are given. These non-volatile hybrid photonic splitters offer the advantages of an extremely small footprint and non-volatile digital programmability, which are favorable to the truly optoelectronic fusion chip.
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49
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Evang V, Reindl J, Schäfer L, Rochotzki A, Pletzer‐Zelgert P, Wuttig M, Mazzarello R. Thermally Controlled Charge-Carrier Transitions in Disordered PbSbTe Chalcogenides. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2022; 34:e2106868. [PMID: 34750901 PMCID: PMC11469063 DOI: 10.1002/adma.202106868] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/30/2021] [Revised: 10/13/2021] [Indexed: 06/13/2023]
Abstract
Binary and ternary chalcogenides have recently attracted much attention due to their wide range of applications including phase-change memory materials, topological insulators, photonic switches, and thermoelectrics. These applications require a precise control of the number and mobility of charge carriers. Here, an unexpected charge-carrier transition in ternary compounds from the PbTe-Sb2 Te3 pseudo-binary line is reported. Upon thermal annealing, sputtered thin films of PbSb2 Te4 and Pb2 Sb2 Te5 undergo a transition in the temperature coefficient of resistance and in the type of the majority charge carriers from n-type to p-type. These transitions are observed upon increasing structural order within one crystallographic phase. To account for this striking observation, it is proposed that the Fermi energy shifts from the tail of the conduction band to the valence band because different levels of overall structural disorder lead to different predominant types of native point defects. This view is confirmed by an extensive computational study, revealing a transition from excess cations and SbPb for high levels of disorder to PbSb prevailing for low disorder. The findings will help fine-tune transport properties in certain chalcogenides via proper thermal treatment, with potential benefits for memories, thermoelectric material optimization, and neuromorphic devices.
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Affiliation(s)
- Valentin Evang
- Institute for Theoretical Solid State PhysicsRWTH Aachen University52056AachenGermany
| | - Johannes Reindl
- I. Institute of Physics (IA)RWTH Aachen University52056AachenGermany
| | - Lisa Schäfer
- I. Institute of Physics (IA)RWTH Aachen University52056AachenGermany
| | | | | | - Matthias Wuttig
- I. Institute of Physics (IA)RWTH Aachen University52056AachenGermany
- JARA‐FIT and JARA‐HPCRWTH Aachen University52056AachenGermany
- Peter Grünberg Institute (PGI 10)Forschungszentrum Jülich GmbH52428JülichGermany
| | - Riccardo Mazzarello
- Institute for Theoretical Solid State PhysicsRWTH Aachen University52056AachenGermany
- JARA‐FIT and JARA‐HPCRWTH Aachen University52056AachenGermany
- Department of PhysicsSapienza Università di RomaPiazzale Aldo Moro 2Roma00185Italy
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50
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Zamani N, Hatef A, Nadgaran H. Temporal Analysis of Photo‐Thermally Induced Reconfigurability in a 1D Gold Grating Filled with a Phase Change Material. ADVANCED THEORY AND SIMULATIONS 2021. [DOI: 10.1002/adts.202100240] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Naser Zamani
- Department of Physics Shiraz University Shiraz 71454 Iran
| | - Ali Hatef
- Nipissing Computational Physics Laboratory (NCPL), Department of Computer Science and Mathematics Nipissing University North Bay Ontario P1B8L7 Canada
| | - Hamid Nadgaran
- Department of Physics Shiraz University Shiraz 71454 Iran
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