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本文在太赫兹频段基于类电磁诱导透明效应(Electromagnetically Induced Transparency, EIT)提出了一种高效率极化转化滤波器，通过非对称结构激励了多能级明模路径，在传统EIT干涉效应的基础上，获得了正交的圆极化转换窗口。通过两组具有相似共振频率的明模相互干涉产生透射窗口，然后构造非对称结构来实现TE和TM极化下的透射窗口偏移，从而实现双频点极化转换。该超材料的单元结构由四个开口T型金属谐振组成。通过分析表面电流分布、频率响应特性以及入射角特性，探究了其工作机理。研究结果显示，该设计在不同极化下实现了电磁诱导透明现象。随后，基于两个入射极化的EIT共振，在0.692 THz处实现了线极化到右旋圆极化转换和0.782 THz处实现了线极化到左旋圆极化转换，透射系数分别为0.7和0.68。这种基于EIT的极化转化具有低损耗和超薄的特点，在紧凑型天线、衍生雷达相控阵和军事工业探测器领域有潜在应用价值。Since traditional polarization converters suffer from large losses during the conversion process, metasurfaces with excellent transmission performance are increasingly needed. This paper proposes an efficient polarization conversion metasurface based on electromagnetically induced transparency-like (EIT-like) in the terahertz band. The multi-level bright mode paths are excited by an asymmetric structure to obtain orthogonal circular polarization conversion windows. The transmission window is generated by the mutual interference of two sets of bright modes with similar resonant frequencies. Then an asymmetric structure is constructed to achieve transmission window shift under TE and TM polarizations, thereby realizing dual-frequency polarization conversion. The metamaterial unit structure consists of four open metal resonant rings and four metal resonant strips. The working mechanism is explored by analyzing the surface current distribution, frequency response, and incident angle characteristics. The results show that electromagnetically induced transparency can be achieved under different polarizations. Furthermore, based on the EIT resonance between the two incident polarizations, the conversion from linear polarization to right-hand circular polarization is achieved at 0.692 THz, and the conversion from linear polarization to left-hand circular polarization is achieved at 0.782 THz, transmission coefficients are 0.7 and 0.68 respectively. According to the Stokes parameters, the corresponding ellipticities η are 96% and 98%, respectively. This EIT-based polarization conversion metasurface with low loss and ultra-thin characteristics has a great potential application value in compact antennas, derived radar phased arrays, and military detectors.
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Keywords:
- Metamaterials /
- Electromagnetic induced transparency effect /
- Polarization conversion /
- Filters
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[1] Zheng D, Lin Y S 2020 Adv. Mater. Technol. 5 202000584.
[2] Mutlu M, Ozbay E 2012 Appl. Phys. Lett. 100 051909.
[3] Yan D, Wang B, Bai Z, Li W 2020 Opt. Express 28 9677.
[4] Li A D, Chen W J, Wei H, Lu G W, Alù A，Qiu C W, Chen L 2022 Phys. Rev. Lett. 129 127401.
[5] Huang Z R, Zheng Y Q, Li J H, Cheng Y Z, Wang J, Zhou Z K, Chen L 2023 Nano. Lett. 23 10991.
[6] Wang Z F, Li C, Wan F Y, Zeng Q S, Fu J H, Wu Q, Song M X 2024 Acta Opt. Sin. 44 02.
[7] Guan D F, You P, Zhang Q, Xiao K, Yong S W 2017 IEEE Trans. Microw. Theory Tech. 65 4925.
[8] Liang D C, Zhang H F, Gu J Q, Li Y F, Tian Z, Ouyang C M, Han J G, Zhang W L 2017 IEEE J. Select. Topics Quantum Electron. 23 1.
[9] Deng Y, Song Z 2020 Opt. Mater. 105 109972.
[10] Li F, Zhang T, Mao M, Zhang H F 2020 J. Opt. 22 095106.
[11] Prakash D, Gupta N 2021 Int. J. Microw. Wirel. Technol. 14 19.
[12] Han L, Tan Q L, Gan Y, Zhang W D, Xiong J J 2020 Results Phys. 19 103377.
[13] Wang Q, Kuang K L, Gao H X, Chu S W, Yu L, Peng Wei 2021 Nanomaterials 11 1350.
[14] Sarkar R, Devi K M, Ghindani D, Prabhu S S, Chowdhury D R, Kumar G 2020 J. Opt. 22 035105.
[15] Li H M, Liu S B, Liu S Y, Wang S Y, Zhang H F, Bian B R, Kong X K 2015 Appl. Phys. Lett. 106 114101.
[16] Li H M, Liu S B, Liu S Y, Wang S Y, Ding G W, Yang H, Yu Z Y, Zhang H F 2015 Appl. Phys. Lett. 106 083511.
[17] Srijan D, Lalita U 2023 NDT & E Int. 139 0963.
[18] Lang T T, Yu Z Y, Zhang J H, Hong Z, Liu J J, Wang P 2023 Sensor Actuat. A-Phys. 360 0924.
[19] Zhu L, Dong L, Guo J, Meng F Y, He X J, Zhao C H, Wu Q 2018 Plasmonics 13 1971.
[20] Yang D, Shen Z Y, Xia Y Q 2021 Appl. Phys. 127 87.
[21] Cao C J, Guo Z H, Sun Y Z, Zhang H F 2022 Opt. Laser Technol. 151 108006.
[22] Yang Y S, Guan D F, Fu Y F, Gu Z Y, Zhang J D, Qian Z P, Wu W 2024 IEEE Antenn. Wirel. Pr. 23 1035.
[23] Khanikaev B, Mousavi S H, Wu C H, Dabidian N, Alici K B, Shvets G 2012 Opt. Commun. 285 3423.
[24] Sun Y Z, Zhang D, Zhang H F 2022 Opt. Express 30 30574.
[25] Meng D J, Wang S Y, Sun X L, Gong R Z, Chen C H 2014 Appl. Phys. Lett. 104 261902.
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