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Mao J, Yang F, Wang Q, Chen Y, Wang N. Switchable Terahertz Metasurfaces for Spin-Selective Absorption and Anomalous Reflection Based on Vanadium Dioxide. SENSORS (BASEL, SWITZERLAND) 2024; 24:4548. [PMID: 39065945 PMCID: PMC11280935 DOI: 10.3390/s24144548] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/02/2024] [Revised: 07/10/2024] [Accepted: 07/11/2024] [Indexed: 07/28/2024]
Abstract
Conventional chiral metasurfaces are constrained by predetermined functionalities and have limited versatility. To address these constraints, we propose a novel chirality-switchable terahertz (THz) metasurface with integrated heating control circuits tailored for spin-selective anomalous reflection, leveraging the phase-change material vanadium dioxide (VO2). The reversible and abrupt insulator-to-metal phase transition feature of VO2 is exploited to facilitate a chiral meta-atom with spin-selectivity capabilities. By employing the Pancharatnam-Berry phase principle, complete 2π reflection phase coverage is achieved by adjusting the orientation of the chiral structure. At the resonant frequency of 0.137 THz, the designed metasurface achieves selective absorption of a circularly polarized wave corresponding to the state of the VO2 patches. Concurrently, it reflects the circularly polarized wave of the opposite chirality anomalously at an angle of 28.4° while maintaining its handedness. This chirality-switchable THz metasurface exhibits promising potential across various applications, including wireless communication data capacity enlargement, polarization modulation, and chirality detection.
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Affiliation(s)
- Jinxian Mao
- School of Microelectronics, Shanghai University, Shanghai 200444, China; (J.M.); (Q.W.); (Y.C.)
| | - Fengyuan Yang
- School of Microelectronics, Shanghai University, Shanghai 200444, China; (J.M.); (Q.W.); (Y.C.)
- Shanghai Collaborative Innovation Center of Intelligent Sensing Chip Technology, Shanghai University, Shanghai 200444, China
| | - Qian Wang
- School of Microelectronics, Shanghai University, Shanghai 200444, China; (J.M.); (Q.W.); (Y.C.)
| | - Yuzi Chen
- School of Microelectronics, Shanghai University, Shanghai 200444, China; (J.M.); (Q.W.); (Y.C.)
| | - Nan Wang
- School of Microelectronics, Shanghai University, Shanghai 200444, China; (J.M.); (Q.W.); (Y.C.)
- Shanghai Collaborative Innovation Center of Intelligent Sensing Chip Technology, Shanghai University, Shanghai 200444, China
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Wang J, Niu Y, Kang J, Qu Z, Duan J, Zhang B. Multipath-controlled bidirectional metasurface for multitasking polarization regulation and absorption. OPTICS EXPRESS 2024; 32:6391-6408. [PMID: 38439343 DOI: 10.1364/oe.512244] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/14/2023] [Accepted: 01/26/2024] [Indexed: 03/06/2024]
Abstract
In the design of metasurfaces, integrating multiple tasks into a single small unit cell and achieving regulation through various paths pose a serious challenge. In this paper, a multipath-controlled bidirectional metasurface (MCBM) is designed to achieve polarization regulation, perfect absorption and total reflection as multitasking functions. The findings demonstrate that under different excitation conditions, when co-planar polarized terahertz (THz) waves are incident normally on the metasurface, the MCBM can convert co-planar polarization to cross-polarization, co-planar polarization to circular polarization wave in reflection mode, and co-planar polarization to cross-polarization in transmission, respectively. When co-planar polarized THz waves are incident from the back side of the metasurface, the tasks of MCBM change to broadband perfect absorption, total reflection, and transmission co-planar polarization to cross-polarization conversion. Remarkably, all operating frequency bands of these tasks are very approximate. Additionally, the multitasking functions can be switched by altering the excitation conditions, and their performance can be regulated through multipath controls, such as the temperature, voltage, and polarization status. Our design provides an effective strategy for multipath-controlled multitasking integrated devices in the THz band.
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Rong C, Cai B, Cheng Y, Chen F, Luo H, Li X. Dual-band terahertz chiral metasurface absorber with enhanced circular dichroism based on temperature-tunable InSb for sensing applications. Phys Chem Chem Phys 2024; 26:5579-5588. [PMID: 38284318 DOI: 10.1039/d3cp05528k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2024]
Abstract
Circular dichroism (CD) in terahertz (THz) regions has been widely used in biomonitoring, analytical chemistry, communication sensing, and other fields. Herein, we present a simple design for a dual-band THz chiral metasurface absorber (CMA) with a stronger CD effect based on temperature-tunable InSb for enhanced sensing applications. The proposed dual-band CMA consisted of a periodic array of the evolved C-shaped InSb adhered to a copper substrate. The designed CMA at 305 K achieved a right-handed circular polarization (RCP)-selective absorbance of 98.86% and 97.43% at 1.65 THz and 1.89 THz, respectively, and left-handed circular polarization (LCP) absorbance of 9.98% and 22.46%, respectively, and exhibited stronger CD values of 0.89 and 0.75. In addition, the CD properties of the designed CMA can be adjusted by changing the geometrical parameters of the unit-cell structure. The simulated electric field and power follow distributions indicate that this dual-band chiral-selective absorption of the designed CMA is due to the different plasma resonance mode excitations for the incident circular polarization (CP) wave. In addition, the CD properties of the designed CMA can be adjusted by changing the geometrical parameters of the unit-cell structure. Furthermore, CD spectra can be dynamically adjusted by varying the outside temperature and refraction index (RI) of the filled analytes. The designed dual-band CMA can function as a high-performance temperature sensor with sensitivities of 4.68 GHz K-1 and 5.52 GHz K-1 and also as an RI sensor with sensitivities of 1080 GHz RIU-1 and 860 GHz RIU-1, respectively. Our proposed tunable dual-band CMA with its exquisite performance has the potential to be widely applied in diverse areas such as detection, sensing, and other related optoelectronic fields.
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Affiliation(s)
- Chenguang Rong
- School of Information Science and Engineering, Wuhan University of Science and Technology, Wuhan, 430081, P. R. China.
| | - Bin Cai
- School of Information Science and Engineering, Wuhan University of Science and Technology, Wuhan, 430081, P. R. China.
- Engineering Research Center for Metallurgical Automation and Detecting Technology Ministry of Education, Wuhan University of Science and Technology, Wuhan, 430081, P. R. China
| | - Yongzhi Cheng
- School of Information Science and Engineering, Wuhan University of Science and Technology, Wuhan, 430081, P. R. China.
- Key Laboratory of High Temperature Electromagnetic Materials and Structure of MOE, Wuhan, 430081, P. R. China
- Hubei Longzhong Laboratory, Xiangyang, 441000, P. R. China
- Engineering Research Center for Metallurgical Automation and Detecting Technology Ministry of Education, Wuhan University of Science and Technology, Wuhan, 430081, P. R. China
| | - Fu Chen
- School of Information Science and Engineering, Wuhan University of Science and Technology, Wuhan, 430081, P. R. China.
- Key Laboratory of High Temperature Electromagnetic Materials and Structure of MOE, Wuhan, 430081, P. R. China
- Hubei Longzhong Laboratory, Xiangyang, 441000, P. R. China
- Engineering Research Center for Metallurgical Automation and Detecting Technology Ministry of Education, Wuhan University of Science and Technology, Wuhan, 430081, P. R. China
| | - Hui Luo
- School of Information Science and Engineering, Wuhan University of Science and Technology, Wuhan, 430081, P. R. China.
- Key Laboratory of High Temperature Electromagnetic Materials and Structure of MOE, Wuhan, 430081, P. R. China
- Hubei Longzhong Laboratory, Xiangyang, 441000, P. R. China
- Engineering Research Center for Metallurgical Automation and Detecting Technology Ministry of Education, Wuhan University of Science and Technology, Wuhan, 430081, P. R. China
| | - Xiangcheng Li
- The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan, 430081, P. R. China.
- Key Laboratory of High Temperature Electromagnetic Materials and Structure of MOE, Wuhan, 430081, P. R. China
- Hubei Longzhong Laboratory, Xiangyang, 441000, P. R. China
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