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He W, Cheng X, Hu S, Ren Z, Yu Z, Wan S, Hu Y, Jiang T. Color coded metadevices toward programmed terahertz switching. LIGHT, SCIENCE & APPLICATIONS 2024; 13:142. [PMID: 38914544 PMCID: PMC11196690 DOI: 10.1038/s41377-024-01495-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/21/2023] [Revised: 05/01/2024] [Accepted: 05/26/2024] [Indexed: 06/26/2024]
Abstract
Terahertz modulators play a critical role in high-speed wireless communication, non-destructive imaging, and so on, which have attracted a large amount of research interest. Nevertheless, all-optical terahertz modulation, an ultrafast dynamical control approach, remains to be limited in terms of encoding and multifunction. Here we experimentally demonstrated an optical-programmed terahertz switching realized by combining optical metasurfaces with the terahertz metasurface, resulting in 2-bit dual-channel terahertz encoding. The terahertz metasurface, made up of semiconductor islands and artificial microstructures, enables effective all-optical programming by providing multiple frequency channels with ultrafast modulation at the nanosecond level. Meanwhile, optical metasurfaces covered in terahertz metasurface alter the spatial light field distribution to obtain color code. According to the time-domain coupled mode theory analysis, the energy dissipation modes in terahertz metasurface can be independently controlled by color excitation, which explains the principle of 2-bit encoding well. This work establishes a platform for all-optical programmed terahertz metadevices and may further advance the application of composite metasurface in terahertz manipulation.
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Affiliation(s)
- Weibao He
- College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha, China
- Nanhu Laser Laboratory, National University of Defense Technology, Changsha, China
- Hunan Provincial Key Laboratory of High Energy Laser Technology, National University of Defense Technology, Changsha, China
| | - Xiang'ai Cheng
- College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha, China
- Nanhu Laser Laboratory, National University of Defense Technology, Changsha, China
- Hunan Provincial Key Laboratory of High Energy Laser Technology, National University of Defense Technology, Changsha, China
| | - Siyang Hu
- College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha, China
| | - Ziheng Ren
- College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha, China
| | - Zhongyi Yu
- College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha, China
| | - Shun Wan
- College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha, China
| | - Yuze Hu
- Institute for Quantum Science and Technology, College of Science, National University of Defense Technology, Changsha, China.
| | - Tian Jiang
- Institute for Quantum Science and Technology, College of Science, National University of Defense Technology, Changsha, China.
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2
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Wang D, Luo S, Xu KD. A Flexible Terahertz Metamaterial Sensor for Pesticide Sensing and Detection. ACS APPLIED MATERIALS & INTERFACES 2024; 16:27969-27978. [PMID: 38752539 DOI: 10.1021/acsami.4c04503] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2024]
Abstract
Terahertz (THz) waves have garnered significant interest across various fields, particularly in high-sensitivity sensing applications. Metamaterials can be employed in THz sensors, specifically for refractive index sensing and pesticide detection due to their high-sensitivity characteristics. In this Article, a dual-band flexible THz metamaterial sensor based on polyimide is proposed for refractive index and pesticide sensing, which is fabricated using ultraviolet (UV) lithography technology and measured by a THz time-domain spectroscope (TDS) system. The resonant frequencies of the sensor are at 0.37 and 1.13 THz, with transmission rates of 2.9% and 0.3%, respectively. With an analyte layer attached to the sensor's surface, the sensitivity of refractive index sensing can be calculated as 0.09 and 0.28 THz/RIU (refractive index unit) at the two resonant frequencies. In order to validate the exceptional pesticide sensing performance of the sensor, chlorpyrifos-methyl acetone solutions with various concentrations are added on it. Furthermore, a monolayer of graphene is coated on the sensor's surface, which is proved capable of improving pesticide sensing sensitivity at low concentrations due to strong π-π stacking interactions with π-electrons in chlorpyrifos-methyl solutions. Therefore, the graphene-coated sensor can be utilized in detecting pesticide solutions with low concentrations, and the sensor without graphene is preferred for high concentration detection. This work provides a novel option for the THz metamaterial sensor with high sensitivity covering a wide pesticide concentration range.
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Affiliation(s)
- Dongxu Wang
- School of Information and Communications Engineering, Xi'an Jiaotong University, Xi'an 710049, China
| | - Siyuan Luo
- Microsystem and Terahertz Research Center, China Academy of Engineering Physics, Chengdu 610200, China
| | - Kai-Da Xu
- School of Information and Communications Engineering, Xi'an Jiaotong University, Xi'an 710049, China
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3
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Yang S, Lin Z, Wang X, Huang J, Yang R, Chen Z, Jia Y, Zeng Z, Cao Z, Zhu H, Hu Y, Li E, Chen H, Wang T, Deng S, Gui X. Stretchable, Transparent, and Ultra-Broadband Terahertz Shielding Thin Films Based on Wrinkled MXene Architectures. NANO-MICRO LETTERS 2024; 16:165. [PMID: 38564038 PMCID: PMC10987438 DOI: 10.1007/s40820-024-01365-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/22/2023] [Accepted: 01/19/2024] [Indexed: 04/04/2024]
Abstract
With the increasing demand for terahertz (THz) technology in security inspection, medical imaging, and flexible electronics, there is a significant need for stretchable and transparent THz electromagnetic interference (EMI) shielding materials. Existing EMI shielding materials, like opaque metals and carbon-based films, face challenges in achieving both high transparency and high shielding efficiency (SE). Here, a wrinkled structure strategy was proposed to construct ultra-thin, stretchable, and transparent terahertz shielding MXene films, which possesses both isotropous wrinkles (height about 50 nm) and periodic wrinkles (height about 500 nm). Compared to flat film, the wrinkled MXene film (8 nm) demonstrates a remarkable 36.5% increase in SE within the THz band. The wrinkled MXene film exhibits an EMI SE of 21.1 dB at the thickness of 100 nm, and an average EMI SE/t of 700 dB μm-1 over the 0.1-10 THz. Theoretical calculations suggest that the wrinkled structure enhances the film's conductivity and surface plasmon resonances, resulting in an improved THz wave absorption. Additionally, the wrinkled structure enhances the MXene films' stretchability and stability. After bending and stretching (at 30% strain) cycles, the average THz transmittance of the wrinkled film is only 0.5% and 2.4%, respectively. The outstanding performances of the wrinkled MXene film make it a promising THz electromagnetic shielding materials for future smart windows and wearable electronics.
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Affiliation(s)
- Shaodian Yang
- State Key Laboratory of Optoelectronic Materials and Technologies, School of Electronics and Information Technology, Sun Yat-Sen University, Guangzhou, 510275, People's Republic of China
| | - Zhiqiang Lin
- National Key Laboratory of Materials for Integrated Circuits, Shenzhen Institute of Advanced Electronic Materials, Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences, Shenzhen, 518055, People's Republic of China
| | - Ximiao Wang
- State Key Laboratory of Optoelectronic Materials and Technologies, School of Electronics and Information Technology, Sun Yat-Sen University, Guangzhou, 510275, People's Republic of China
- Guangdong Province Key Laboratory of Display Material and Technology, Guangzhou, 510275, People's Republic of China
| | - Junhua Huang
- State Key Laboratory of Optoelectronic Materials and Technologies, School of Electronics and Information Technology, Sun Yat-Sen University, Guangzhou, 510275, People's Republic of China
| | - Rongliang Yang
- State Key Laboratory of Optoelectronic Materials and Technologies, School of Electronics and Information Technology, Sun Yat-Sen University, Guangzhou, 510275, People's Republic of China
| | - Zibo Chen
- State Key Laboratory of Optoelectronic Materials and Technologies, School of Electronics and Information Technology, Sun Yat-Sen University, Guangzhou, 510275, People's Republic of China
| | - Yi Jia
- China Academy of Aerospace Science and Innovation, Beijing, 100176, People's Republic of China
| | - Zhiping Zeng
- School of Materials Science and Engineering, Sun Yat-Sen University, Guangzhou, 510275, People's Republic of China
| | - Zhaolong Cao
- State Key Laboratory of Optoelectronic Materials and Technologies, School of Electronics and Information Technology, Sun Yat-Sen University, Guangzhou, 510275, People's Republic of China
- Guangdong Province Key Laboratory of Display Material and Technology, Guangzhou, 510275, People's Republic of China
| | - Hongjia Zhu
- State Key Laboratory of Optoelectronic Materials and Technologies, School of Electronics and Information Technology, Sun Yat-Sen University, Guangzhou, 510275, People's Republic of China
- Guangdong Province Key Laboratory of Display Material and Technology, Guangzhou, 510275, People's Republic of China
| | - Yougen Hu
- National Key Laboratory of Materials for Integrated Circuits, Shenzhen Institute of Advanced Electronic Materials, Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences, Shenzhen, 518055, People's Republic of China
| | - Enen Li
- GBA Branch of Aerospace Information Research Institute, Chinese Academy of Sciences, Guangzhou, 510700, People's Republic of China
- School of Electronic, Electrical and Communication Engineering, University of Chinese Academy of Sciences, Beijing, 100049, People's Republic of China
- Guangdong Provincial Key Laboratory of Terahertz Quantum Electromagnetics, Guangzhou, 510700, People's Republic of China
| | - Huanjun Chen
- State Key Laboratory of Optoelectronic Materials and Technologies, School of Electronics and Information Technology, Sun Yat-Sen University, Guangzhou, 510275, People's Republic of China.
- Guangdong Province Key Laboratory of Display Material and Technology, Guangzhou, 510275, People's Republic of China.
| | - Tianwu Wang
- GBA Branch of Aerospace Information Research Institute, Chinese Academy of Sciences, Guangzhou, 510700, People's Republic of China.
- School of Electronic, Electrical and Communication Engineering, University of Chinese Academy of Sciences, Beijing, 100049, People's Republic of China.
- Guangdong Provincial Key Laboratory of Terahertz Quantum Electromagnetics, Guangzhou, 510700, People's Republic of China.
| | - Shaozhi Deng
- State Key Laboratory of Optoelectronic Materials and Technologies, School of Electronics and Information Technology, Sun Yat-Sen University, Guangzhou, 510275, People's Republic of China.
- Guangdong Province Key Laboratory of Display Material and Technology, Guangzhou, 510275, People's Republic of China.
| | - Xuchun Gui
- State Key Laboratory of Optoelectronic Materials and Technologies, School of Electronics and Information Technology, Sun Yat-Sen University, Guangzhou, 510275, People's Republic of China.
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Liu J, Dai H, Ju J, Cheng K. A triple Fano resonance Si-graphene metasurface for multi-channel tunable ultra-narrow band sensing. Phys Chem Chem Phys 2024; 26:9462-9474. [PMID: 38446428 DOI: 10.1039/d3cp05550g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/07/2024]
Abstract
In this work, a dielectric metasurface composed of a silicon nanodisk etched with a square hole is proposed. By introducing C4v symmetry breaking, the symmetry-protected bound states in the continuum (SP-BIC) is transformed into a quasi-BIC (Q-BIC), simultaneously inducing triple Fano resonances in the near-infrared light band corresponding to one dipole and two Q-BIC resonances. The characteristics of Q-BIC resonances are elucidated through multipole decomposition and near-field distribution analysis. Subsequently, monolayer graphene is integrated into the Si metasurface. The light field in the composite metasurface can be flexibly modulated by changing the Fermi level of graphene. This modulation enables optimal transmission with an enhancement of up to 252%, while the confined electromagnetic energy experiences a remarkable increase of about 1020%. Simulation results demonstrate that the Si-graphene composite metasurface exhibits a high refractive index sensitivity of 162 nm RIU-1, accompanied by a figure of merit of 170.526 RIU-1. This composite metasurface holds promise as a high-performance sensor in the near-infrared band and has potential for application in the fields of active tunable optical devices and biochemical sensing.
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Affiliation(s)
- Jukun Liu
- College of Science, Shanghai Institute of Technology, Shanghai 201418, China.
| | - Hongxiang Dai
- College of Science, Shanghai Institute of Technology, Shanghai 201418, China.
| | - Jiaqi Ju
- College of Science, Shanghai Institute of Technology, Shanghai 201418, China.
| | - Ke Cheng
- School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, China
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5
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Jain M, Patel MJ, Liu L, Gosai J, Khemnani M, Gogoi HJ, Chee MY, Guerrero A, Lew WS, Solanki A. Insights into synaptic functionality and resistive switching in lead iodide flexible memristor devices. NANOSCALE HORIZONS 2024; 9:438-448. [PMID: 38259176 DOI: 10.1039/d3nh00505d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/24/2024]
Abstract
Neuromorphic platforms are gaining popularity due to their superior efficiency, low power consumption, and adaptable parallel signal processing capabilities, overcoming the limitations of traditional von Neumann architecture. We conduct an in-depth investigation into the factors influencing the resistive switching mechanism in memristor devices utilizing lead iodide (PbI2). We establish correlations between device performance and morphological features, unveiling synaptic like behaviour of device making it suitable for range of flexible neuromorphic applications. Notably, a highly reliable unipolar switching mechanism is identified, exhibiting stability even under mechanical strain (with a bending radius of approximately 4 mm) and in high humidity environment (at 75% relative humidity) without the need for encapsulation. The investigation delves into the complex interplay of charge transport, ion migration and the active interface, elucidating the factors contributing to the remarkable resistive switching observed in PbI2-based memristors. The detailed findings highlight synaptic behaviors akin to the modulation of synaptic strengths, with an impressive potentiation and depression of 2 × 104 cycles, emphasizing the role of spike time-dependent plasticity (STDP). The flexible platform demonstrates exceptional performance, achieving a simulated accuracy rate of 95.06% in recognizing modified patterns from the National Institute of Standards and Technology (MNIST) dataset with just 30 training epochs. Ultimately, this research underscores the potential of PbI2-based flexible memristor devices as versatile component for neuromorphic computing. Moreover, it demonstrate the robustness of PbI2 memristors in terms of their resistive switching capabilities, showcasing resilience both mechanically and electrically. This underscores their potential in replicating synaptic functions for advanced information processing systems.
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Affiliation(s)
- Muskan Jain
- Department of Physics, School of Energy Technology, Pandit Deendayal Energy University, Raysan, Gandhinagar 382426, India.
- Flextronics Lab, Pandit Deendayal Energy University, Gandhinagar, Gujarat 382426, India
| | - Mayur Jagdishbhai Patel
- Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati 781039, Assam, India
| | - Lingli Liu
- School of Physical and Mathematical Sciences, Nanyang Technological University, 637371, Singapore
| | - Jeny Gosai
- Flextronics Lab, Pandit Deendayal Energy University, Gandhinagar, Gujarat 382426, India
- Department of Chemistry, School of Energy Technology, Pandit Deendayal Energy University, Raysan, Gandhinagar 382426, India
| | - Manish Khemnani
- Department of Physics, School of Energy Technology, Pandit Deendayal Energy University, Raysan, Gandhinagar 382426, India.
- Flextronics Lab, Pandit Deendayal Energy University, Gandhinagar, Gujarat 382426, India
| | - Himangshu Jyoti Gogoi
- Department of Electrical Engineering, Indian Institute of Technology Guwahati, 781039 Assam, India
| | - Mun Yin Chee
- School of Physical and Mathematical Sciences, Nanyang Technological University, 637371, Singapore
| | - Antonio Guerrero
- Institute of Advanced Materials (INAM), Universitat Jaume I, 12006 Castello, Spain
| | - Wen Siang Lew
- School of Physical and Mathematical Sciences, Nanyang Technological University, 637371, Singapore
| | - Ankur Solanki
- Department of Physics, School of Energy Technology, Pandit Deendayal Energy University, Raysan, Gandhinagar 382426, India.
- Flextronics Lab, Pandit Deendayal Energy University, Gandhinagar, Gujarat 382426, India
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6
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Chen Y, Guo G, Liu S, Yin S, Huang W, Zhang W. Quasi-bound states in the continuum induced by supercell coupling. OPTICS EXPRESS 2023; 31:18807-18823. [PMID: 37381312 DOI: 10.1364/oe.489454] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/09/2023] [Accepted: 05/10/2023] [Indexed: 06/30/2023]
Abstract
In this paper, we propose what we believe to be a novel coupling mechanism for generating quasi-bound states in the continuum (quasi-BIC) in symmetrical metasurface structures. We demonstrate for the first time in theoretical predictions that supercell coupling can induce quasi-BIC(s). We utilize the coupled mode theory (CMT) to analyze the physical mechanism for the generation of quasi-bound states in such symmetrical structures, which result from our investigation of the coupling between sub-cells that are separated from supercells. We verify our theory by using both full-wave simulations and experiments.
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7
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Li M, Ruan B, Zhang B, Gao E, Zhang Z, Chang X, Li H. Generation of symmetry-protected bound states in the continuum in a graphene plasmonic waveguide system for optical switching. Phys Chem Chem Phys 2023; 25:14552-14557. [PMID: 37191145 DOI: 10.1039/d3cp00572k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/17/2023]
Abstract
A graphene-involved plasmonic lossy system that allows coupling between surface plasmon polaritons and waveguide modes is proposed. The physical mechanism behind the hybrid resonance modes is investigated carefully through finite element method (FEM) simulations and rigorous coupled wave theory (RCWA). We demonstrate that by introducing an incident angle to break the symmetry of the structure, the bound states in the continuum (BIC) evolve to an observable quasi-BIC with new resonance dips, and the generated signals possess a very high Q-factor. Such transformation is investigated carefully by calculating the band structure of the system and the corresponding Q-factors. The results showed that the calculated results from the band structure are consistent with the simulations. In addition, the hybrid plasmonic system allows for switching modulation due to the tunability of graphene, and the max modulation depth of nearly 100% is reached. The outstanding Q-factor and dynamic tunability of this easy-to-fabricate hybrid structure may be helpful in engineering various plasmonic devices, including tunable optical switches, absorbers, sensors, etc.
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Affiliation(s)
- Min Li
- School of Physics and Electronics, Central South University, Changsha 410083, China.
| | - Banxian Ruan
- School of Physics and Electronics, Central South University, Changsha 410083, China.
| | - Baihui Zhang
- School of Physics and Electronics, Central South University, Changsha 410083, China.
| | - Enduo Gao
- School of Physics and Electronics, Central South University, Changsha 410083, China.
| | - Zhenbin Zhang
- School of Physics and Electronics, Central South University, Changsha 410083, China.
| | - Xia Chang
- School of Physics and Electronics, Central South University, Changsha 410083, China.
| | - Hongjian Li
- School of Physics and Electronics, Central South University, Changsha 410083, China.
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8
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Wang D, Xu KD, Luo S, Cui Y, Zhang L, Cui J. A high Q-factor dual-band terahertz metamaterial absorber and its sensing characteristics. NANOSCALE 2023; 15:3398-3407. [PMID: 36722909 DOI: 10.1039/d2nr05820k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
In this paper, a dual-band metamaterial absorber in the terahertz frequencies is proposed and its refractive index sensing characteristics is analyzed. The metamaterial structure is designed using a square metal ring with four T-shaped strips loaded outside of the ring, where the metal periodic array is on top of a silicon wafer backed with a metal ground plane. The resonant frequencies of the absorber are at 0.89 and 1.36 THz, whose absorption rates are both over 99% under normal TE and TM polarized incidences. The full widths at half maximum of them are 4.4 and 11.2 GHz, respectively, resulting in high quality factors (Q-factors) for these two frequency bands. The absorption rate of the absorber remains stable as the incident and polarized angles are changed. Several proposed metamaterial absorbers are experimentally fabricated and electron beam lithography (EBL) technology is employed. Good measurement results of the dual-band absorption performance are obtained using a terahertz time-domain spectroscopy system based on photoconductive antennas. Furthermore, the metamaterial absorber also shows sensing properties for analytes with different refractive indices or thicknesses. This work provides a new choice for the design of high-Q dual-band terahertz metamaterial absorbers and their application to refractive index sensing.
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Affiliation(s)
- Dongxu Wang
- School of Information and Communications Engineering, Xi'an Jiaotong University, Xi'an 710049, China.
| | - Kai-Da Xu
- School of Information and Communications Engineering, Xi'an Jiaotong University, Xi'an 710049, China.
- State Key Laboratory of Surface Physics and Department of Physics, Fudan University, Shanghai 200433, China
- State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200241, China
| | - Siyuan Luo
- Microsystem and Terahertz Research Center, China Academy of Engineering Physics, Chengdu 610200, China
| | - Yuqing Cui
- State Key Laboratory for Manufacturing Systems Engineering, Xi'an Jiaotong University, Xi'an 710049, China
| | - Liuyang Zhang
- State Key Laboratory for Manufacturing Systems Engineering, Xi'an Jiaotong University, Xi'an 710049, China
| | - Jianlei Cui
- State Key Laboratory for Manufacturing Systems Engineering, Xi'an Jiaotong University, Xi'an 710049, China
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9
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Xu X, Lou J, Gao M, Wu S, Fang G, Huang Y. Ultrafast Modulation of THz Waves Based on MoTe 2-Covered Metasurface. SENSORS (BASEL, SWITZERLAND) 2023; 23:1174. [PMID: 36772214 PMCID: PMC9921109 DOI: 10.3390/s23031174] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/20/2022] [Revised: 01/14/2023] [Accepted: 01/17/2023] [Indexed: 06/18/2023]
Abstract
The sixth generation (6G) communication will use the terahertz (THz) frequency band, which requires flexible regulation of THz waves. For the conventional metallic metasurface, its electromagnetic properties are hard to be changed once after being fabricated. To enrich the modulation of THz waves, we report an all-optically controlled reconfigurable electromagnetically induced transparency (EIT) effect in the hybrid metasurface integrated with a 10-nm thick MoTe2 film. The experimental results demonstrate that under the excitation of the 800 nm femtosecond laser pulse with pump fluence of 3200 μJ/cm2, the modulation depth of THz transmission amplitude at the EIT window can reach 77%. Moreover, a group delay variation up to 4.6 ps is observed to indicate an actively tunable slow light behavior. The suppression and recovery of the EIT resonance can be accomplished within sub-nanoseconds, enabling an ultrafast THz photo-switching and providing a promising candidate for the on-chip devices of the upcoming 6G communication.
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Affiliation(s)
- Xing Xu
- Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100094, China
- Innovation Laboratory of Terahertz Biophysics, National Innovation Institute of Defense Technology, Beijing 100071, China
- Key Laboratory of Electromagnetic Radiation and Sensing Technology, Chinese Academy of Sciences, Beijing 100190, China
- School of Electronic, Electrical and Communication Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Jing Lou
- Innovation Laboratory of Terahertz Biophysics, National Innovation Institute of Defense Technology, Beijing 100071, China
| | - Mingxin Gao
- Innovation Laboratory of Terahertz Biophysics, National Innovation Institute of Defense Technology, Beijing 100071, China
| | - Shiyou Wu
- Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100094, China
- Key Laboratory of Electromagnetic Radiation and Sensing Technology, Chinese Academy of Sciences, Beijing 100190, China
- School of Electronic, Electrical and Communication Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Guangyou Fang
- Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100094, China
- Key Laboratory of Electromagnetic Radiation and Sensing Technology, Chinese Academy of Sciences, Beijing 100190, China
- School of Electronic, Electrical and Communication Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Yindong Huang
- Innovation Laboratory of Terahertz Biophysics, National Innovation Institute of Defense Technology, Beijing 100071, China
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10
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Hu Y, Tong M, Hu S, He W, Cheng X, Jiang T. Reassessing Fano Resonance for Broadband, High-Efficiency, and Ultrafast Terahertz Wave Switching. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2023; 10:e2204494. [PMID: 36385743 PMCID: PMC9839846 DOI: 10.1002/advs.202204494] [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: 08/06/2022] [Revised: 10/14/2022] [Indexed: 06/16/2023]
Abstract
Miniaturized ultrafast switchable optical components with high efficiency and broadband response are in high demand to the development of optical imaging, sensing, and high-speed communication. Sharp Fano-type resonance switched by active materials is one of the key concepts that underpins the control of light in metaoptics with high sensitivity. However, actuating such metasurfaces exhibits a long-standing trade-off between modulation depth and operational bandwidth. Here, the limitations are circumvented by theoretical analysis, numerical simulation, and experimental realization of an achromatic Fano metasurface so that a high contrast of tunability with ultrafast switching rate over a broad range of frequency is achieved. By developing the physics of inter-mode coupling, the Fano metasurface is designed according to a complete phase diagram derived from coupled mode theory. Unlike conventional Fano metasurfaces, the cross-polarized inter-metaatoms coupling is discovered as a superior ability of high-efficiency broadband achromatic polarization conversion. To prove the ultrasensitive nature, a metadevice is constructed by incorporating a thin amorphous Ge layer with a weak photoconductivity perturbation. Transmission modulation over broadband frequency range from 0.6 to 1.1 THz is thus successfully realized, featuring its merits of modulation depth over 90% and On-Off-On switching cycle less than 10 ps.
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Affiliation(s)
- Yuze Hu
- Institute for Quantum Science and TechnologyCollege of ScienceNational University of Defense TechnologyChangsha410073P. R. China
| | - Mingyu Tong
- College of Advanced Interdisciplinary StudiesNational University of Defense TechnologyChangsha410073P. R. China
| | - Siyang Hu
- College of Advanced Interdisciplinary StudiesNational University of Defense TechnologyChangsha410073P. R. China
| | - Weibao He
- College of Advanced Interdisciplinary StudiesNational University of Defense TechnologyChangsha410073P. R. China
| | - Xiang'ai Cheng
- College of Advanced Interdisciplinary StudiesNational University of Defense TechnologyChangsha410073P. R. China
| | - Tian Jiang
- Institute for Quantum Science and TechnologyCollege of ScienceNational University of Defense TechnologyChangsha410073P. R. China
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11
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Jiao Y, Lou J, Ma Z, Cong L, Xu X, Zhang B, Li D, Yu Y, Sun W, Yan Y, Hu S, Liu B, Huang Y, Sun L, Wang R, Singh R, Fan Y, Chang C, Du X. Photoactive terahertz metasurfaces for ultrafast switchable sensing of colorectal cells. MATERIALS HORIZONS 2022; 9:2984-2992. [PMID: 36073353 DOI: 10.1039/d2mh00787h] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Metasurfaces with a strongly enhanced local field are envisioned as a powerful platform for ultrasensitive optical sensors to significantly amplify imperceptible differences between compatible bioanalytes. Through the use of phototunable silicon-based terahertz (THz) metasurfaces, we experimentally demonstrate ultrafast switchable sensing functions. It is found that the THz responses of the coupled-resonances in the metasurfaces shift from Lorentz-lattice mode to electromagnetism-induced transparency (EIT) mode under optical pumping within an ultrashort time of 32 ps, enabling an ultrafast sensitive sensor. For the Lorentz-lattice mode, the THz time-domain signal directly shows a highly sensitive response to detect tiny analytes without extra Fourier transformation as the mismatch between the two modes increases. Once the metasurfaces are switched to the EIT mode, the silicon-metal hybrid structure supports frequency-domain sensing ability due to strong field confinement with a sensitivity of 118.4 GHz/RIU. Both of the sensing configurations contribute to more subtle information and guarantee the accuracy of the sensor performance. Combined with the aforementioned advantages, the proposed metasurfaces have successfully identified colorectal cells between normal, adenoma, and cancer states in experiments. This work furnishes a new paradigm of constructing reliable and flexible metasurface sensors and can be extended to other optics applications.
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Affiliation(s)
- Yanan Jiao
- Department of General Surgery, First Medical Center, Chinese PLA General Hospital, Beijing 100853, China.
- Innovation Laboratory of Terahertz Biophysics, National Innovation Institute of Defense Technology, Beijing 100071, China.
| | - Jing Lou
- Innovation Laboratory of Terahertz Biophysics, National Innovation Institute of Defense Technology, Beijing 100071, China.
- Air and Missile Defense College, Air Force Engineering University, Xi'an 710051, China
| | - Zhaofu Ma
- Department of General Surgery, First Medical Center, Chinese PLA General Hospital, Beijing 100853, China.
- Innovation Laboratory of Terahertz Biophysics, National Innovation Institute of Defense Technology, Beijing 100071, China.
| | - Longqing Cong
- Department of Electrical and Electronic Engineering, Southern University of Science and Technology, Shenzhen 518055, China
| | - Xing Xu
- Innovation Laboratory of Terahertz Biophysics, National Innovation Institute of Defense Technology, Beijing 100071, China.
| | - Bin Zhang
- Department of General Surgery, First Medical Center, Chinese PLA General Hospital, Beijing 100853, China.
- Innovation Laboratory of Terahertz Biophysics, National Innovation Institute of Defense Technology, Beijing 100071, China.
| | - Dingchang Li
- Department of General Surgery, First Medical Center, Chinese PLA General Hospital, Beijing 100853, China.
| | - Ying Yu
- Air and Missile Defense College, Air Force Engineering University, Xi'an 710051, China
| | - Wen Sun
- Department of Anesthesiology, The Second Affiliated Hospital, Tianjin University of Traditional Chinese Medicine, Tianjin 300250, China
| | - Yang Yan
- Department of General Surgery, First Medical Center, Chinese PLA General Hospital, Beijing 100853, China.
| | - Shidong Hu
- Department of General Surgery, First Medical Center, Chinese PLA General Hospital, Beijing 100853, China.
| | - Boyan Liu
- Department of General Surgery, First Medical Center, Chinese PLA General Hospital, Beijing 100853, China.
| | - Yindong Huang
- Innovation Laboratory of Terahertz Biophysics, National Innovation Institute of Defense Technology, Beijing 100071, China.
| | - Lang Sun
- Innovation Laboratory of Terahertz Biophysics, National Innovation Institute of Defense Technology, Beijing 100071, China.
| | - Ride Wang
- Innovation Laboratory of Terahertz Biophysics, National Innovation Institute of Defense Technology, Beijing 100071, China.
| | - Ranjan Singh
- Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371, Singapore
| | - Yuancheng Fan
- Key Laboratory of Light Field Manipulation and Information Acquisition, Ministry of Industry and Information Technology and School of Physical Science and Technology, Northwestern Polytechnical University, Xi'an 710129, China.
| | - Chao Chang
- Innovation Laboratory of Terahertz Biophysics, National Innovation Institute of Defense Technology, Beijing 100071, China.
| | - Xiaohui Du
- Department of General Surgery, First Medical Center, Chinese PLA General Hospital, Beijing 100853, China.
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12
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Yang J, Zhang G, Xu L, Li Y, Deng G, Yin Z, Lu H. Highly efficient and tunable terahertz polarization converter based on double subwavelength metallic gratings infiltrated with liquid crystal. APPLIED OPTICS 2022; 61:8265-8272. [PMID: 36256138 DOI: 10.1364/ao.469263] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/01/2022] [Accepted: 08/27/2022] [Indexed: 06/16/2023]
Abstract
In this work, a tunable cross-polarized transmission structure at the terahertz frequency was demonstrated, and the polarization state during modulation was investigated. The proposed structure can significantly enhance the polarization conversion performance of nematic liquid crystals by leveraging the formation of a Fabry-Perot-like resonant cavity that consists of two metal gratings. As a result, the incident waves are continuously reflected in the liquid crystal layer to complete the accumulation of polarization angle changes. From the experimental results acquired, it was concluded that the insertion loss of the cross-polarization transmission was less than 3 dB and the extinction ratio was larger than 28 dB in the frequency range of 388-426 GHz. Our work provides useful insights for improving the efficiency of cross-polarization conversion by enhancing the resonance process in a Fabry-Perot-like resonant cavity and, thus, significantly extending the equivalent optical path.
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13
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Abdelraouf OAM, Wang Z, Liu H, Dong Z, Wang Q, Ye M, Wang XR, Wang QJ, Liu H. Recent Advances in Tunable Metasurfaces: Materials, Design, and Applications. ACS NANO 2022; 16:13339-13369. [PMID: 35976219 DOI: 10.1021/acsnano.2c04628] [Citation(s) in RCA: 21] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Metasurfaces, a two-dimensional (2D) form of metamaterials constituted by planar meta-atoms, exhibit exotic abilities to tailor electromagnetic (EM) waves freely. Over the past decade, tremendous efforts have been made to develop various active materials and incorporate them into functional devices for practical applications, pushing the research of tunable metasurfaces to the forefront of nanophotonics. Those active materials include phase change materials (PCMs), semiconductors, transparent conducting oxides (TCOs), ferroelectrics, liquid crystals (LCs), atomically thin material, etc., and enable intriguing performances such as fast switching speed, large modulation depth, ultracompactness, and significant contrast of optical properties under external stimuli. Integration of such materials offers substantial tunability to the conventional passive nanophotonic platforms. Tunable metasurfaces with multifunctionalities triggered by various external stimuli bring in rich degrees of freedom in terms of material choices and device designs to dynamically manipulate and control EM waves on demand. This field has recently flourished with the burgeoning development of physics and design methodologies, particularly those assisted by the emerging machine learning (ML) algorithms. This review outlines recent advances in tunable metasurfaces in terms of the active materials and tuning mechanisms, design methodologies, and practical applications. We conclude this review paper by providing future perspectives in this vibrant and fast-growing research field.
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Affiliation(s)
- Omar A M Abdelraouf
- School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371, Singapore
- Institute of Materials Research and Engineering, Agency for Science, Technology and Research (A*STAR), 2 Fusionopolis Way, Singapore 138634, Singapore
| | - Ziyu Wang
- Institute of Materials Research and Engineering, Agency for Science, Technology and Research (A*STAR), 2 Fusionopolis Way, Singapore 138634, Singapore
| | - Hailong Liu
- Institute of Materials Research and Engineering, Agency for Science, Technology and Research (A*STAR), 2 Fusionopolis Way, Singapore 138634, Singapore
| | - Zhaogang Dong
- Institute of Materials Research and Engineering, Agency for Science, Technology and Research (A*STAR), 2 Fusionopolis Way, Singapore 138634, Singapore
| | - Qian Wang
- Institute of Materials Research and Engineering, Agency for Science, Technology and Research (A*STAR), 2 Fusionopolis Way, Singapore 138634, Singapore
| | - Ming Ye
- School of Electrical and Electronic Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore
| | - Xiao Renshaw Wang
- School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371, Singapore
- School of Electrical and Electronic Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore
| | - Qi Jie Wang
- School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371, Singapore
- School of Electrical and Electronic Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore
| | - Hong Liu
- Institute of Materials Research and Engineering, Agency for Science, Technology and Research (A*STAR), 2 Fusionopolis Way, Singapore 138634, Singapore
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14
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Lu Y, Li T, Yang M, Yao H, Liang L, Yan X, Lv KK, Wang M, Yang Q, Wei C, Shao J, Yao J. Dual control of multi-band resonances with a metal-halide perovskite-integrated terahertz metasurface. NANOSCALE 2022; 14:12703-12712. [PMID: 35993444 DOI: 10.1039/d2nr00292b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
The phenomenon of multi-resonant Fano resonances is important for the design of biosensors and communication fields. There are very few studies reporting the multi-band Fano resonance metamaterials with more than three resonance frequencies, or the tunable optical metamaterials to control the multi-band Fano resonance characteristics. Here, we report dual control of multi-band Fano resonances with a metal-halide perovskite-integrated terahertz metasurface by lasers and an electrical field. By tuning the conductivity of the perovskite film on the metasurface, ultrasensitive optoelectronic modulation was achieved. The terahertz transmission amplitude exhibited increasing and decreasing stages. We analyzed the physical phenomena and found that capacitance effects and Fermi-level enhancement had significant roles in the optical- and electronic-modulation experiments. The resonant frequencies in the electronic modulation had broader frequency shifts and a higher and wider tunable modulation depth range. More importantly, the maximum modulation depth was as high as 197%, with a significant fluctuation in the amplitude and more unstable frequency shifts in the transmission spectra.
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Affiliation(s)
- Yuying Lu
- Precision Optical Manufacturing and Testing Centre, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai, 201800, PR China.
- Key Laboratory for High Power Laser Material of Chinese Academy of Sciences, Shanghai Institute of Optics and Fine Mechanics, Shanghai, 201800, PR China
- Centre of Material Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing, 100049, PR China
| | - Tengteng Li
- College of Precision Instruments and Opto-electronics Engineering, Tianjin University, Tianjin, 300072, China
| | - Maosheng Yang
- Institute of Micro-nano Optoelectronics and Terahertz Technology and School of Mechanical Engineering, Jiangsu University, Zhen Jiang, 212013, China
- School of Opto-electric Engineering, Zao Zhuang University, Zao Zhuang, 277160, China.
| | - Haiyun Yao
- School of Opto-electric Engineering, Zao Zhuang University, Zao Zhuang, 277160, China.
| | - Lanju Liang
- School of Opto-electric Engineering, Zao Zhuang University, Zao Zhuang, 277160, China.
| | - Xin Yan
- School of Opto-electric Engineering, Zao Zhuang University, Zao Zhuang, 277160, China.
| | - Kai Kai Lv
- School of Opto-electric Engineering, Zao Zhuang University, Zao Zhuang, 277160, China.
| | - Meng Wang
- School of Opto-electric Engineering, Zao Zhuang University, Zao Zhuang, 277160, China.
| | - Qili Yang
- School of Opto-electric Engineering, Zao Zhuang University, Zao Zhuang, 277160, China.
| | - Chaoyang Wei
- Precision Optical Manufacturing and Testing Centre, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai, 201800, PR China.
- Key Laboratory for High Power Laser Material of Chinese Academy of Sciences, Shanghai Institute of Optics and Fine Mechanics, Shanghai, 201800, PR China
- Centre of Material Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing, 100049, PR China
| | - Jianda Shao
- Key Laboratory for High Power Laser Material of Chinese Academy of Sciences, Shanghai Institute of Optics and Fine Mechanics, Shanghai, 201800, PR China
- Hangzhou Institute for Advanced Study, University of Chinese Academy of Sciences, Hangzhou, 310024, PR China
- Centre of Material Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing, 100049, PR China
| | - Jianquan Yao
- College of Precision Instruments and Opto-electronics Engineering, Tianjin University, Tianjin, 300072, China
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15
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Wu J, Sun Y, Wu F, Wu B, Wu X. Tunable high-quality-factor absorption in a graphene monolayer based on quasi-bound states in the continuum. BEILSTEIN JOURNAL OF NANOTECHNOLOGY 2022; 13:675-681. [PMID: 35957671 PMCID: PMC9344540 DOI: 10.3762/bjnano.13.59] [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: 03/28/2022] [Accepted: 07/08/2022] [Indexed: 06/15/2023]
Abstract
A tunable graphene absorber, composed of a graphene monolayer and a substrate spaced by a subwavelength dielectric grating, is proposed and investigated. Strong light absorption in the graphene monolayer is achieved due to the formation of embedded optical quasi-bound states in the continuum in the subwavelength dielectric grating. The physical origin of the absorption with high quality factor is examined by investigating the electromagnetic field distributions. Interestingly, we found that the proposed absorber possesses high spatial directivity and performs similar to an antenna, which can also be utilized as a thermal emitter. Besides, the spectral position of the absorption peak can not only be adjusted by changing the geometrical parameters of dielectric grating, but it is also tunable by a small change in the Fermi level of the graphene sheet. This novel scheme to tune the absorption of graphene may find potential applications for the realization of ultrasensitive biosensors, photodetectors, and narrow-band filters.
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Affiliation(s)
- Jun Wu
- College of Electrical Engineering, Anhui Polytechnic University, Wuhu, 241000, China
| | - Yasong Sun
- Basic Research Center, School of Power and Energy, Northwestern Polytechnical University, Xi’an 710064, Shaanxi, China
- Center of Computational Physics and Energy Science, Yangtze River Delta Research Institute of NPU, Northwestern Polytechnical University, Taicang 215400, Jiangsu, China
| | - Feng Wu
- School of Optoelectronic Engineering, Guangdong Polytechnic Normal University, Guangzhou 510665, China
| | - Biyuan Wu
- Basic Research Center, School of Power and Energy, Northwestern Polytechnical University, Xi’an 710064, Shaanxi, China
- Shandong Institute of Advanced Technology, Jinan 250100, China
| | - Xiaohu Wu
- Shandong Institute of Advanced Technology, Jinan 250100, China
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16
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Wang H, Ling F, Luo C, Li D, Xiao Y, Chang Z, Xu Z, Zeng Y, Wang W, Yao J. Active terahertz modulator based on optically controlled organometal halide perovskite MAPbI 2Br. APPLIED OPTICS 2022; 61:1171-1176. [PMID: 35201169 DOI: 10.1364/ao.444667] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/19/2021] [Accepted: 01/11/2022] [Indexed: 06/14/2023]
Abstract
In this paper, an active terahertz modulator based on optically controlled organometal halide perovskite MAPbI2Br is proposed. The terahertz wave time-domain transmission of the MAPbI2Br/Al2O3 sample was measured by a terahertz time-domain spectrometer. Experimental results indicate that the MAPbI2Br/Al2O3 sample showed an obvious optical-power-dependent modulation effect on transmission of the terahertz wave; the maximum modulation depth of the modulator can reach 59.99% at 0.3 THz when the external pump optical power is up to 1500 mW.
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17
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Cai Y, Zhu H, Shi Q, Cheng Y, Chang L, Huang W. Photothermal conversion of Ti 2O 3 film for tuning terahertz waves. iScience 2022; 25:103661. [PMID: 35036863 PMCID: PMC8753118 DOI: 10.1016/j.isci.2021.103661] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2021] [Revised: 12/08/2021] [Accepted: 12/16/2021] [Indexed: 11/27/2022] Open
Abstract
Dynamic tuning of terahertz (THz) wave is vital for the development of next generation THz devices. Utilization of solar energy for tuning THz waves is a promising, eco-friendly, and sustainable way to expand THz application scenarios. Ti2O3 with an ultranarrow bandgap of 0.1eV exhibits intriguing thermal-induced metal-insulator transition (MIT), and possesses excellent photothermal conversion efficiency. Herein, Ti2O3 film was fabricated by a two-step magnetron sputtering method, and exhibited an excellent photothermal conversion efficiency of 90.45% and demonstrated temperature-dependent THz transmission characteristics with a wideband at 0.1-1 THz. We supposed to combine photothermal conversion characteristics with temperature-dependent THz transmission properties of Ti2O3 film, which could introduce solar light as the energy source for tuning THz waves. Our work will provide new sight for investigating MIT characteristics of Ti2O3 at THz regime and exhibit huge potential in the application of tuning terahertz waves in outdoor scenarios in the future.
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Affiliation(s)
- Yu Cai
- College of Materials Science and Engineering, Sichuan University, Chengdu, Sichuan 610065, China
| | - Hongfu Zhu
- College of Materials Science and Engineering, Sichuan University, Chengdu, Sichuan 610065, China
| | - Qiwu Shi
- College of Materials Science and Engineering, Sichuan University, Chengdu, Sichuan 610065, China
| | - Ye Cheng
- College of Materials Science and Engineering, Sichuan University, Chengdu, Sichuan 610065, China
| | - Lei Chang
- College of Materials Science and Engineering, Sichuan University, Chengdu, Sichuan 610065, China
| | - Wanxia Huang
- College of Materials Science and Engineering, Sichuan University, Chengdu, Sichuan 610065, China
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18
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Yang M, Li T, Yan X, Liang L, Yao H, Sun Z, Li J, Li J, Wei D, Wang M, Ye Y, Song X, Zhang H, Yao J. Dual-Stimulus Control for Ultra-Wideband and Multidimensional Modulation in Terahertz Metasurfaces Comprising Graphene and Metal Halide Perovskites. ACS APPLIED MATERIALS & INTERFACES 2022; 14:2155-2165. [PMID: 34958542 DOI: 10.1021/acsami.1c15222] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Perovskites and graphene are receiving a meteoric rise in popularity in the field of active photonics because they exhibit excellent optoelectronic properties for dynamic manipulation of light-matter interactions. However, challenges still exist, such as the instability of perovskites under ambient conditions and the low Fermi level of graphene in experiments. These shortcomings limit the scope of applications when they are used alone in advanced optical devices. However, the combination of graphene and perovskites is still a promising route for efficient control of light-matter interactions. Here, we report a dual-optoelectronic metadevice fabricated by integrating terahertz metasurfaces with a sandwich complex composed of graphene, polyimide, and perovskites for ultra-wideband and multidimensional manipulation of higher-order Fano resonances. Owing to the photogenerated carriers and electrostatic doping effect, the dual optoelectronic metadevice showed different manipulation behavior at thermal imbalance (electrostatic doping state of the system). The modulation depth of the transmission amplitude reached 200%, the total resonant frequency shift was 800 GHz, and the tunable range of the resonant frequency was 68.8%. In addition, modulation of the maximum phase reached 346°. This work will inspire a new generation of metasurface-based optical devices that combine two active materials.
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Affiliation(s)
- Maosheng Yang
- Institute of Micro-Nano Optoelectronics and Terahertz Technology, and School of Mechanical Engineering, Jiangsu University, Zhenjiang 212013, China
| | - Tengteng Li
- College of Precision Instruments and Opto-Electronics Engineering, Tianjin University, Tianjin 300072, China
| | - Xin Yan
- School of Opto-Electronic Engineering, Zao Zhuang University, Zao Zhuang 277160, China
| | - Lanju Liang
- School of Opto-Electronic Engineering, Zao Zhuang University, Zao Zhuang 277160, China
| | - Haiyun Yao
- School of Opto-Electronic Engineering, Zao Zhuang University, Zao Zhuang 277160, China
| | - Zhaoqing Sun
- College of Materials Science and Engineering, Key Laboratory of Advanced Functional Materials, Education Ministry of China, Beijing University of Technology, Beijing 100124, China
| | - Jing Li
- Institute of Micro-Nano Optoelectronics and Terahertz Technology, and School of Mechanical Engineering, Jiangsu University, Zhenjiang 212013, China
| | - Jie Li
- College of Precision Instruments and Opto-Electronics Engineering, Tianjin University, Tianjin 300072, China
| | - Dequan Wei
- School of Opto-Electronic Engineering, Zao Zhuang University, Zao Zhuang 277160, China
| | - Meng Wang
- School of Opto-Electronic Engineering, Zao Zhuang University, Zao Zhuang 277160, China
| | - Yunxia Ye
- Institute of Micro-Nano Optoelectronics and Terahertz Technology, and School of Mechanical Engineering, Jiangsu University, Zhenjiang 212013, China
| | - Xiaoxian Song
- Institute of Micro-Nano Optoelectronics and Terahertz Technology, and School of Mechanical Engineering, Jiangsu University, Zhenjiang 212013, China
| | - Haiting Zhang
- Institute of Micro-Nano Optoelectronics and Terahertz Technology, and School of Mechanical Engineering, Jiangsu University, Zhenjiang 212013, China
| | - Jianquan Yao
- College of Precision Instruments and Opto-Electronics Engineering, Tianjin University, Tianjin 300072, China
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19
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Gao J, Liu H, Zhang M, Liu M, Zhang H, Zhang Y. Dynamic switching between bound states in the continuum (BIC) and quasi-BIC based on a Dirac semimetal terahertz metasurface. Phys Chem Chem Phys 2022; 24:25571-25579. [DOI: 10.1039/d2cp03248a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
This work presents a Dirac semimetal–metal metasurface for the dynamic switching of terahertz-band BIC to quasi-BIC. The display of clear letters is achieved by arranging the metasurface array and applying different voltages.
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Affiliation(s)
- Jingxiang Gao
- College of Electronics and Information Engineering, Shandong University of Science and Technology, Qingdao, 266510, China
| | - Hang Liu
- College of Electronics and Information Engineering, Shandong University of Science and Technology, Qingdao, 266510, China
| | - Man Zhang
- Key Laboratory of Micro Nano Optoelectronic Devices and Intelligent Perception Systems, School of Electronic Information Engineering, Yangtze Normal University, Chongqing, 408100, China
| | - Meng Liu
- College of Electronics and Information Engineering, Shandong University of Science and Technology, Qingdao, 266510, China
| | - Huiyun Zhang
- College of Electronics and Information Engineering, Shandong University of Science and Technology, Qingdao, 266510, China
| | - Yuping Zhang
- College of Electronics and Information Engineering, Shandong University of Science and Technology, Qingdao, 266510, China
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20
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Lou J, Xu X, Huang Y, Yu Y, Wang J, Fang G, Liang J, Fan C, Chang C. Optically Controlled Ultrafast Terahertz Metadevices with Ultralow Pump Threshold. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2021; 17:e2104275. [PMID: 34611988 DOI: 10.1002/smll.202104275] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/20/2021] [Revised: 09/09/2021] [Indexed: 06/13/2023]
Abstract
Arming metasurface with active materials furnishes a feasible solution to dynamically control over terahertz (THz) waves, which is extremely significant for the realization of upcoming sixth generation telecommunications. However, the present active materials are mainly limited to single external driving field, hindering the capability of metasurface for flexible manipulation of THz waves. Besides, less attention has been paid to the energy question how to significantly reduce the pump threshold for achieving the desired function. Here, a germanium (Ge) hybrid Fano metasurface under dual-stimulus control is experimentally demonstrated. Photoexcitation of Ge thin film enables 100% modulation depth of Fano resonance and ultrafast switching time within 10 ps. By adding current-bias, the pump threshold to modulate the metasurface is greatly reduced from 1600 to 200 µJ cm-2 . Different from the optical modulation independent of film thickness, it is found that the current function is in proportion with the thickness of Ge thin film. Moreover, it is demonstrated that compared to the single optical-stimulus, the THz amplitude modulation is increased by 56.3% under dual-stimulus function. This work naturally improves the flexibility and practicality of Ge-based metadevice and inspires more innovations to boost the development of switchable sensing, lasing spacer, and nonlinear systems.
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Affiliation(s)
- Jing Lou
- School of Physics, Peking University, Beijing, 100871, China
- Innovation Laboratory of Terahertz Biophysics, National Innovation Institute of Defense Technology, Beijing, 100071, China
- Air and Missile Defense College, Air Force Engineering University, Xi'an, 710051, China
| | - Xing Xu
- Innovation Laboratory of Terahertz Biophysics, National Innovation Institute of Defense Technology, Beijing, 100071, China
- Key Laboratory of Electromagnetic Radiation and Sensing Technology, Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing, 100094, China
| | - Yindong Huang
- Innovation Laboratory of Terahertz Biophysics, National Innovation Institute of Defense Technology, Beijing, 100071, China
| | - Ying Yu
- Air and Missile Defense College, Air Force Engineering University, Xi'an, 710051, China
| | - Jun Wang
- Air and Missile Defense College, Air Force Engineering University, Xi'an, 710051, China
| | - Guangyou Fang
- Key Laboratory of Electromagnetic Radiation and Sensing Technology, Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing, 100094, China
| | - Jiangang Liang
- Air and Missile Defense College, Air Force Engineering University, Xi'an, 710051, China
| | - Chunhai Fan
- School of Chemistry and Chemical Engineering, Frontiers Science Center for Transformative Molecules, and Shanghai, Key Laboratory for Nucleic Acids Chemistry and Nanomedicine, Institute of Molecular Medicine, Renji Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai, 200240, China
| | - Chao Chang
- School of Physics, Peking University, Beijing, 100871, China
- Innovation Laboratory of Terahertz Biophysics, National Innovation Institute of Defense Technology, Beijing, 100071, China
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21
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Ma H, Wu X, Du W, Zhao L, Zhong Y, Chen S, Gao P, Yue S, Zhang Q, Liu W, Liu X. Edge Raman enhancement at layered PbI 2platelets induced by laser waveguide effect. NANOTECHNOLOGY 2021; 33:035203. [PMID: 34627132 DOI: 10.1088/1361-6528/ac2e5a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/13/2021] [Accepted: 10/09/2021] [Indexed: 06/13/2023]
Abstract
As a two-dimensional (2D) layered semiconductor, lead iodide (PbI2) has been widely used in optoelectronics owing to its unique crystal structure and distinctive optical and electrical properties. A comprehensive understanding of its optical performance is essential for further application and progress. Here, we synthesized regularly shaped PbI2platelets using the chemical vapor deposition method. Raman scattering spectroscopy of PbI2platelets was predominantly enhanced when the laser radiated at the edge according to Raman mapping spectroscopy. Combining the outcome of polarized Raman scattering spectroscopy and finite-difference time domain simulation analysis, the Raman enhancement was proven to be the consequence of the enhancement effects inherent to the high refractive index contrast waveguide, which is naturally formed in well-defined PbI2platelets. Because of the enlarged excited area determined by the increased propagation length of the laser in the PbI2platelet formed waveguide, the total Raman enhancements are acquired rather than a localized point enhancement. Finally, the Raman enhancement factor is directly related to the thickness of the PbI2platelet, which further confirms the waveguide-enhanced edge Raman. Our investigation of the optical properties of PbI2platelets offers reference for potential 2D layered-related optoelectronic applications.
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Affiliation(s)
- Heyi Ma
- School of Chemical Sciences, University of Chinese Academy of Sciences, Beijing 100049, People's Republic of China
- CAS Key Laboratory of Standardization and Measurement for Nanotechnology, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing 100190, People's Republic of China
| | - Xianxin Wu
- CAS Key Laboratory of Standardization and Measurement for Nanotechnology, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing 100190, People's Republic of China
- University of Chinese Academy of Sciences, Beijing 100049, People's Republic of China
| | - Wenna Du
- CAS Key Laboratory of Standardization and Measurement for Nanotechnology, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing 100190, People's Republic of China
- University of Chinese Academy of Sciences, Beijing 100049, People's Republic of China
- Key Laboratory of Semiconductor Materials Science, Beijing Key Laboratory of Low Dimensional Semiconductor Materials and Devices, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, People's Republic of China
| | - Liyun Zhao
- School of Materials Science and Engineering, Peking University, Beijing 100871, People's Republic of China
| | - Yangguang Zhong
- CAS Key Laboratory of Standardization and Measurement for Nanotechnology, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing 100190, People's Republic of China
| | - Shulin Chen
- Electron Microscopy Laboratory, International Center for Quantum Materials, School of Physics, Peking University, Beijing 100871, People's Republic of China
| | - Peng Gao
- Electron Microscopy Laboratory, International Center for Quantum Materials, School of Physics, Peking University, Beijing 100871, People's Republic of China
| | - Shuai Yue
- CAS Key Laboratory of Standardization and Measurement for Nanotechnology, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing 100190, People's Republic of China
- University of Chinese Academy of Sciences, Beijing 100049, People's Republic of China
| | - Qing Zhang
- School of Materials Science and Engineering, Peking University, Beijing 100871, People's Republic of China
| | - Wei Liu
- School of Chemical Sciences, University of Chinese Academy of Sciences, Beijing 100049, People's Republic of China
| | - Xinfeng Liu
- CAS Key Laboratory of Standardization and Measurement for Nanotechnology, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing 100190, People's Republic of China
- University of Chinese Academy of Sciences, Beijing 100049, People's Republic of China
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22
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Tan TC, Srivastava YK, Ako RT, Wang W, Bhaskaran M, Sriram S, Al-Naib I, Plum E, Singh R. Active Control of Nanodielectric-Induced THz Quasi-BIC in Flexible Metasurfaces: A Platform for Modulation and Sensing. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2021; 33:e2100836. [PMID: 34050568 DOI: 10.1002/adma.202100836] [Citation(s) in RCA: 50] [Impact Index Per Article: 16.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/01/2021] [Revised: 04/02/2021] [Indexed: 06/12/2023]
Abstract
A bound state in the continuum (BIC) is a nonradiating state of light embedded in the continuum of propagating modes providing drastic enhancement of the electromagnetic field and its localization at micro-nanoscale. However, access to such modes in the far-field requires symmetry breaking. Here, it is demonstrated that a nanometric dielectric or semiconductor layer, 1000 times thinner than the resonant wavelength (λ/1000), induces a dynamically controllable quasi-bound state in the continuum (QBIC) with ultrahigh quality factor in a symmetric metallic metasurface at terahertz frequencies. Photoexcitation of nanostrips of germanium activates ultrafast switching of a QBIC resonance with 200% transmission intensity modulation and complete recovery within 7 ps on a low-loss flexible substrate. The nanostrips also form microchannels that provide an opportunity for BIC-based refractive index sensing. An optimization model is presented for (switchable) QBIC resonances of metamaterial arrays of planar symmetric resonators modified with any (active) dielectric for inverse metamaterial design that can serve as an enabling platform for active micro-nanophotonic devices.
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Affiliation(s)
- Thomas CaiWei Tan
- Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore, 637371, Singapore
- Centre for Disruptive Photonic Technologies, The Photonics Institute, Nanyang Technological University, Singapore, 637371, Singapore
| | - Yogesh Kumar Srivastava
- Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore, 637371, Singapore
- Centre for Disruptive Photonic Technologies, The Photonics Institute, Nanyang Technological University, Singapore, 637371, Singapore
| | - Rajour Tanyi Ako
- Functional Materials and Microsystems Research Group and the Micro Nano Research Facility, RMIT University, Melbourne, VIC 3000, Australia
| | - Wenhao Wang
- Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore, 637371, Singapore
- Centre for Disruptive Photonic Technologies, The Photonics Institute, Nanyang Technological University, Singapore, 637371, Singapore
- Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu, 610054, China
| | - Madhu Bhaskaran
- Functional Materials and Microsystems Research Group and the Micro Nano Research Facility, RMIT University, Melbourne, VIC 3000, Australia
- ARC Centre of Excellence for Transformative Meta-Optical Systems, RMIT University, Melbourne, VIC 3000, Australia
| | - Sharath Sriram
- Functional Materials and Microsystems Research Group and the Micro Nano Research Facility, RMIT University, Melbourne, VIC 3000, Australia
- ARC Centre of Excellence for Transformative Meta-Optical Systems, RMIT University, Melbourne, VIC 3000, Australia
| | - Ibraheem Al-Naib
- Biomedical Engineering Department, College of Engineering, Imam Abdulrahman Bin Faisal University, Dammam, 34212, Saudi Arabia
| | - Eric Plum
- Centre for Photonic Metamaterials & Optoelectronics Research Centre, Zepler Institute, University of Southampton, Southampton, SO17 1BJ, UK
| | - Ranjan Singh
- Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore, 637371, Singapore
- Centre for Disruptive Photonic Technologies, The Photonics Institute, Nanyang Technological University, Singapore, 637371, Singapore
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23
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Huang Y, Liu Y, Shao Y, Han G, Zhang J, Hao Y. Actively Tunable Fano Resonance Based on a Bowtie-Shaped Black Phosphorus Terahertz Sensor. NANOMATERIALS (BASEL, SWITZERLAND) 2021; 11:1442. [PMID: 34072566 PMCID: PMC8226983 DOI: 10.3390/nano11061442] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/16/2021] [Revised: 05/20/2021] [Accepted: 05/26/2021] [Indexed: 12/02/2022]
Abstract
An ultrasensitive Terahertz (THz) sensor consisting of the sub-wavelength bowtie black phosphorus (BP) and an annular gold (Au) ring is proposed. The interference between the resonance generated by the bowtie BP and the Au ring creates a Fano-type resonance and makes ultrasensitive sensing realizable. Firstly, we demonstrate the Fano resonance of the coupled nanostructures by adjusting the geometry dimensions of the Au ring and the Fermi level of BP. Moreover, the Poynting vector distributions of the THz sensor are simulated to analyze the properties of Fano resonance. Importantly, a figure of merit (FOM) value as high as 69.3 is achieved and the proposed Fano resonance sensor shows a maximum sensitivity of 9.3 μm/RIU. Our structure can function as a facile and efficient building block of biochemical nano-sensing application based on Fano resonance at THz frequency.
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Affiliation(s)
- Yan Huang
- Wide Bandgap Semiconductor Technology Disciplines State Key Laboratory, School of Microelectronics, Xidian University, Xi’an 710071, China; (Y.H.); (G.H.); (J.Z.); (Y.H.)
| | - Yan Liu
- Wide Bandgap Semiconductor Technology Disciplines State Key Laboratory, School of Microelectronics, Xidian University, Xi’an 710071, China; (Y.H.); (G.H.); (J.Z.); (Y.H.)
| | - Yao Shao
- Shanghai Energy Internet Research Institute of State, Grid251 Libing Road, Pudong New Area, Shanghai 201210, China;
| | - Genquan Han
- Wide Bandgap Semiconductor Technology Disciplines State Key Laboratory, School of Microelectronics, Xidian University, Xi’an 710071, China; (Y.H.); (G.H.); (J.Z.); (Y.H.)
| | - Jincheng Zhang
- Wide Bandgap Semiconductor Technology Disciplines State Key Laboratory, School of Microelectronics, Xidian University, Xi’an 710071, China; (Y.H.); (G.H.); (J.Z.); (Y.H.)
| | - Yue Hao
- Wide Bandgap Semiconductor Technology Disciplines State Key Laboratory, School of Microelectronics, Xidian University, Xi’an 710071, China; (Y.H.); (G.H.); (J.Z.); (Y.H.)
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24
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Wang J, Tan P, Li S, Wang G, Guo W, Zhou Z, Tian H. Active polarization-independent plasmon-induced transparency metasurface with suppressed magnetic attenuation. OPTICS EXPRESS 2021; 29:15541-15550. [PMID: 33985252 DOI: 10.1364/oe.425849] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/24/2021] [Accepted: 04/30/2021] [Indexed: 06/12/2023]
Abstract
A tunable polarization-independent plasmon-induced transparency (PIT) metasurface based on connected half-ring and split-ring resonators is proposed to working in the terahertz band. We analyze the PIT effect in metasurfaces comprising of ring resonator and split ring resonator. Due to the magnetic attenuation caused by the reverse current between the two resonators, the relative position of the ring resonator and the split-ring resonator greatly affects the strength of the PIT effect. Magnetic attenuation weakens the dark mode of the split ring resonator. Through simulation and experiment, it is found that connecting the ring resonator and split-ring resonator can avoid magnetic attenuation and achieve a stronger PIT window. Furthermore, the fourfold rotation structure of the connected half-ring and split-ring resonator on silicon substrate achieves an optically controlled polarization-independent PIT effect. The design would provide significant guidance in multifunctional active devices, such as modulators and switches in terahertz communication.
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25
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Hu Y, Tong M, Xu Z, Cheng X, Jiang T. Bifunctional Spatiotemporal Metasurfaces for Incident Angle-Tunable and Ultrafast Optically Switchable Electromagnetically Induced Transparency. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2021; 17:e2006489. [PMID: 33838009 DOI: 10.1002/smll.202006489] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/17/2020] [Revised: 03/08/2021] [Indexed: 06/12/2023]
Abstract
Advances in tunable metamaterials/metasurfaces facilitates their utilization in novel optical components, and lead to many breakthroughs in light tailoring by giving birth to diverse spatiotemporal dynamics. In the ascendant field of terahertz (THz) photonics, the ultrafast modulation is the fundamental process of technological advancements in high-speed wireless communications, sensing, and imaging. However, the current research efforts have been mainly devoted to studies of single functionality under the control of one stimulus, which has plateaued in terms of innovative new features. Here, building on the incident angle-induced C2 symmetry breaking of split ring pairs, we experimentally demonstrate extremely versatile, ultrafast THz switching behaviors at continuously alterable resonant states. The direction-controlled resonance hybridization provides another excellent degree of routing freedom, owing to its robustness, simplicity, and wide tunability. By leveraging such virtues, single LC mode and EIT-like resonance under normal and oblique incidence conditions are both effectively switched-off by means of photon injection. Considering the ultrashort lifetime of free carriers in MoSe2 crystal, the corresponding transient dynamics show an ultrafast recovery time within 700 ps. The strategy proposed here is a viable pathway for multidimensional THz wave manipulation, which gears up a crucial step for diversified functionalities in deployable metaphotonic devices.
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Affiliation(s)
- Yuze Hu
- College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha, 410073, China
| | - Mingyu Tong
- College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha, 410073, China
| | - Zhongjie Xu
- College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha, 410073, China
| | - Xiangai Cheng
- College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha, 410073, China
| | - Tian Jiang
- Beijing Interdisciplinary Research Center, National University of Defense Technology, Beijing, 100010, China
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26
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Fan Y, He X, Zhang F, Cai W, Li C, Fu Q, Sydorchuk NV, Prosvirnin SL. Fano-Resonant Hybrid Metamaterial for Enhanced Nonlinear Tunability and Hysteresis Behavior. RESEARCH (WASHINGTON, D.C.) 2021; 2021:9754083. [PMID: 34485916 PMCID: PMC8380421 DOI: 10.34133/2021/9754083] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/28/2021] [Accepted: 07/19/2021] [Indexed: 11/16/2022]
Abstract
Artificial resonant metamaterial with subwavelength localized filed is promising for advanced nonlinear photonic applications. In this article, we demonstrate enhanced nonlinear frequency-agile response and hysteresis tunability in a Fano-resonant hybrid metamaterial. A ceramic cuboid is electromagnetically coupled with metal cut-wire structure to excite the high-Q Fano-resonant mode in the dielectric/metal hybrid metamaterial. It is found that the significant nonlinear response of the ceramic cuboid can be employed for realization of tunable metamaterials by exciting its magnetic mode, and the trapped mode with an asymmetric Fano-like resonance is beneficial to achieve notable nonlinear modulation on the scattering spectrum. The nonlinear tunability of both the ceramic structure and the ceramic/metal hybrid metamaterial is promising to extend the operation band of metamaterials, providing possibility in practical applications with enhanced light-matter interactions.
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Affiliation(s)
- Yuancheng Fan
- Key Laboratory of Light Field Manipulation and Information Acquisition, Ministry of Industry and Information Technology and School of Physical Science and Technology, Northwestern Polytechnical University, Xi'an 710129, China
- Research & Development Institute of Northwestern Polytechnical University in Shenzhen, Shenzhen 518057, China
| | - Xuan He
- Key Laboratory of Light Field Manipulation and Information Acquisition, Ministry of Industry and Information Technology and School of Physical Science and Technology, Northwestern Polytechnical University, Xi'an 710129, China
- Research & Development Institute of Northwestern Polytechnical University in Shenzhen, Shenzhen 518057, China
| | - Fuli Zhang
- Key Laboratory of Light Field Manipulation and Information Acquisition, Ministry of Industry and Information Technology and School of Physical Science and Technology, Northwestern Polytechnical University, Xi'an 710129, China
- Research & Development Institute of Northwestern Polytechnical University in Shenzhen, Shenzhen 518057, China
| | - Weiqi Cai
- Key Laboratory of Light Field Manipulation and Information Acquisition, Ministry of Industry and Information Technology and School of Physical Science and Technology, Northwestern Polytechnical University, Xi'an 710129, China
- Research & Development Institute of Northwestern Polytechnical University in Shenzhen, Shenzhen 518057, China
| | - Chang Li
- Key Laboratory of Light Field Manipulation and Information Acquisition, Ministry of Industry and Information Technology and School of Physical Science and Technology, Northwestern Polytechnical University, Xi'an 710129, China
- Research & Development Institute of Northwestern Polytechnical University in Shenzhen, Shenzhen 518057, China
| | - Quanhong Fu
- Key Laboratory of Light Field Manipulation and Information Acquisition, Ministry of Industry and Information Technology and School of Physical Science and Technology, Northwestern Polytechnical University, Xi'an 710129, China
- Research & Development Institute of Northwestern Polytechnical University in Shenzhen, Shenzhen 518057, China
| | - Nataliia V. Sydorchuk
- Institute of Radio Astronomy, National Academy of Sciences of Ukraine, Kharkiv 61002, Ukraine
| | - Sergey L. Prosvirnin
- Institute of Radio Astronomy, National Academy of Sciences of Ukraine, Kharkiv 61002, Ukraine
- Karazin Kharkiv National University, Kharkiv 61077, Ukraine
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27
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Hu Y, You J, Tong M, Zheng X, Xu Z, Cheng X, Jiang T. Pump-Color Selective Control of Ultrafast All-Optical Switching Dynamics in Metaphotonic Devices. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2020; 7:2000799. [PMID: 32714770 PMCID: PMC7375251 DOI: 10.1002/advs.202000799] [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: 03/03/2020] [Revised: 03/31/2020] [Indexed: 06/11/2023]
Abstract
Incorporating active materials into metamaterials is expected to yield exciting advancements in the unprecedented versatility of dynamically controlling optical properties, which sheds new light on the future optoelectronics. The exploration of emerging semiconductors into terahertz (THz) meta-atoms potentially allows achieving ultrafast nanodevices driven by various applications, such as biomedical sensing/imaging, ultrawide-band communications and security scanners. However, ultrafast optical switching of THz radiation is currently limited to a single level of tuning speed, which is a main hurdle to achieve multifunctionalities. Here, a hybrid metadevice which can realize the pump-wavelength controlled ultrafast switching response by the functionalization of double photoactive layers is demonstrated experimentally. A whole cycle of electromagnetically induced transparency switching with a half-recovery state changes from 0.78 ns to 8.8 ps as pump wavelength varies from near infrared to near ultraviolet regions. The observed pump-color selective switching speed changing from nanosecond scale to picosecond scale is ascribed to the wavelength-dependent penetration length of Ge and the contrasting defect states between noncrystalline Ge and epitaxial Si layers. It is believed that the schemes regarding pump-color controllable ultrafast switching behavior introduced here can inspire more innovations across the field of ultrafast photonics and can boost the reconfigurable metamaterial applications.
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Affiliation(s)
- Yuze Hu
- College of Advanced Interdisciplinary StudiesNational University of Defense TechnologyChangsha410073P. R. China
| | - Jie You
- National Innovation Institute of Defense TechnologyBeijing100010P. R. China
| | - Mingyu Tong
- College of Advanced Interdisciplinary StudiesNational University of Defense TechnologyChangsha410073P. R. China
| | - Xin Zheng
- National Innovation Institute of Defense TechnologyBeijing100010P. R. China
| | - Zhongjie Xu
- College of Advanced Interdisciplinary StudiesNational University of Defense TechnologyChangsha410073P. R. China
| | - Xiangai Cheng
- College of Advanced Interdisciplinary StudiesNational University of Defense TechnologyChangsha410073P. R. China
| | - Tian Jiang
- College of Advanced Interdisciplinary StudiesNational University of Defense TechnologyChangsha410073P. R. China
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28
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Shi Q, Tian K, Zhu H, Li ZR, Zhu LG, Deng H, Huang W, Fu Q. Flexible and Giant Terahertz Modulation Based on Ultra-Strain-Sensitive Conductive Polymer Composites. ACS APPLIED MATERIALS & INTERFACES 2020; 12:9790-9796. [PMID: 31995363 DOI: 10.1021/acsami.9b21890] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Dynamic tuning of terahertz (THz) wave has a great potential application as smart THz devices, such as switches, modulators, sensors, and so on. However, the realization of flexible THz modulation with high efficiency is rarely observed, which is nearly absent from the booming development and demands on flexible electronics. Here, we report a flexible THz modulation based on conductive polymer composites composed of thermoplastic polyurethane (TPU) and conductive particles (Ni). By designing the additive content of Ni particles, such a flexible layer exhibits resistivity change of 6-7 orders under tensile strain due to the formation of an electron-transport channel provided by the in situ evolution of the Ni network. It could be used to dynamically control the THz transmission with a giant modulation depth of around 96%, at a high strain operation (up to around 58.5%). Moreover, these characteristics are demonstrated to be available for highly tension sensitive THz spectroscopy and imaging. This work opens up a connection between flexible polymer-based composites and THz dynamic devices. It proposes an unprecedented flexible THz modulation with giant tuning efficiency and provides a scheme for contactless and passive tension sensors.
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Affiliation(s)
- Qiwu Shi
- College of Materials Science and Engineering , Sichuan University , Chengdu 610065 , Sichuan , China
- Department of Materials Science and Engineering , University of California , Berkeley , California 94720 , United States
| | - Ke Tian
- College of Polymer Science and Engineering, State Key Laboratory of Polymer Materials Engineering , Sichuan University , Chengdu 610065 , Sichuan , China
| | - Hongfu Zhu
- College of Materials Science and Engineering , Sichuan University , Chengdu 610065 , Sichuan , China
| | - Zi-Run Li
- Institute of Fluid Physics , China Academy of Engineering Physics , Mianyang 621900 , Sichuan , China
| | - Li-Guo Zhu
- Institute of Fluid Physics , China Academy of Engineering Physics , Mianyang 621900 , Sichuan , China
| | - Hua Deng
- College of Polymer Science and Engineering, State Key Laboratory of Polymer Materials Engineering , Sichuan University , Chengdu 610065 , Sichuan , China
| | - Wanxia Huang
- College of Materials Science and Engineering , Sichuan University , Chengdu 610065 , Sichuan , China
| | - Qiang Fu
- College of Polymer Science and Engineering, State Key Laboratory of Polymer Materials Engineering , Sichuan University , Chengdu 610065 , Sichuan , China
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