基于圆形双箭头太赫兹线偏振转换器的设计及性能分析  

Design and Performance Analysis of Terahertz Linear Polarization Converter Based on Circular Double-head Arrow

作　　者：李文宇[1,2] 董丽娟 李榜全[1,2] 孟田华 LI Wenyu;DONG Lijuan;LI Bangquan;MENG Tianhua(Institute of Solid State Physics,Shanxi Datong University,Datong Shanxi,037009;Shanxi Provincial Key Laboratory of Microstructure Electromagnetic Functional Materials,Shanxi Datong University,Datong Shanxi,037009)

机构地区：[1]山西大同大学固体物理研究所,山西大同037009 [2]微结构电磁功能材料省市共建山西省重点实验室,山西大同037009

出　　处：《山西大同大学学报（自然科学版）》2024年第4期1-4,共4页Journal of Shanxi Datong University(Natural Science Edition)

基　　金：国家自然科学基金[62071312];山西省应用基础研究项目[202203021221212];山西大同大学博士科研启动基金[2023-B-34]。

摘　　要：设计了一种基于圆形双箭头(circular double-head arrow,CDHA)单元结构阵列的高效太赫兹波线偏振转换器,该偏振转换器是由CDHA单元结构阵列上下两侧添加一对正交金属光栅构成。该结构在0.36~1.51THz下偏振转换率超过99%,相对带宽为123%,正交金属光栅与CDHA形成一个法布里-珀罗腔,可以有效地阻止交叉偏振反射和共偏振透射,显著增大了交叉偏振波的透射。不同线偏振波沿不同方向入射的透射特性仿真计算结果表明,该偏振转换器还可以用作太赫兹波分束器和不同线偏振态选择器,在低频段0.36~1.02 THz范围内,该器件依然可以保持较高的偏振转换率。An efficient terahertz linear polarization converter based on circular double-head arrow(CDHA)element array is designed.The polarization converter is composed of a pair of orthogonal metal gratings added to the upper and lower sides of the CDHA element array.The structure has a polarization conversion rate of over 99%and a relative bandwidth of 123%at 0.36-1.51 THz.In this structure,the orthogonal metal grating and CDHA form a Fabry-Perot cavity,which can effectively prevent cross-polarized reflection and co-polarized transmission,and significantly increase the transmission of cross-polarized waves.The transmission spectra of different linearly polarized waves incident in different directions are simulated.It is found that the multilayer CDHA metasurface can also be used as a terahertz beam splitter and a selector of different linearly polarized states.It is shown that the device can still maintain a high polarization conversion rate in the low frequency range of 0.36-1.02 THz.

关 键 词：偏振转换 超表面 太赫兹 

分 类 号：O436.3[机械工程—光学工程]