太赫兹人工表面等离子体共面激发与高Q传感  

Coplanar excitation of terahertz spoof surface plasmon and high-Q sensing

作　　者：严德贤 程钢 李尔平 李向军 章雪茹 吴依琳 YAN De-xian;CHENG Gang;LI Er-ping;LI Xiang-jun;ZHANG Xue-ru;WU Yi-lin(College of Information Science and Electronic Engineering,Zhejiang University,Hangzhou 310027,China;Key Laboratory of Electromagnetic Wave Information Technology and Metrology of Zhejiang Province,College of Information Engineering,China Jiliang University,Hangzhou 310018,China)

机构地区：[1]浙江大学信息与电子工程学院,浙江杭州310027 [2]中国计量大学信息工程学院、浙江省电磁波信息技术与计量检测重点实验室,浙江杭州310018

出　　处：《中国光学（中英文）》2023年第4期933-947,共15页Chinese Optics

基　　金：国家重点研发计划资助项目(No.2021YFF0600300);国家自然科学基金(No.62001444);浙江省自然科学基金(No.LQ20F010009)。

摘　　要：本文提出使用单层光栅超表面结构耦合的方式实现太赫兹人工表面等离子体激元(SSP)共面激发,克服了通过介质耦合器在实际应用时需要反射测量等缺点。在单层金属结构上同时构造周期性光栅和太赫兹SSP复合结构,当太赫兹波垂直入射时,可实现光栅波矢和SSP波矢相匹配,激发SSP模式,在透射谱中可以产生高Q值谐振峰,其Q因子可以达到1923。分析了结构参数对光栅耦合超表面透射谱以及色散特性的影响。基于该结构透射谱中的高Q谐振峰进行传感研究,在谐振中心频率为0.22 THz时,实现传感灵敏度为67 GHz/RIU。本文所提出的光栅耦合超表面复合结构仅使用单层超表面结构实现了太赫兹SSP模式的激发以及高Q传感,在诸多实际应用领域具有较大的研究潜力。In this paper,the coplanar excitation of terahertz Spoof Surface Plasmon(SSP)realized by using a single-layer grating meta-surface coupling method is proposed,which overcomes the disadvantages such as the reflection measurement when applying the medium couplers.The periodic grating and terahertz SSP composite structure are simultaneously constructed on the monolayer metal structure.When the terahertz waves are incident vertically,the wave vector of grating structures and the wave vector of SSPs are matched,and the SSP mode can be excited.The high Q value resonant peaks can be generated in the transmission spectrum,and the Q factor can reach 1923.The effects of the structural parameters on the grating-coupled meta-surface transmission spectrum and dispersion characteristics are also analyzed.In addition,based on the high Q resonant peak in the transmission spectrum of the designed structure,the high sensing sensitivity is about 67 GHz/RIU at the resonant center frequency of 0.22 THz.The structure proposed in this paper,which realizes terahertz SSP excitation and high Q sensing by treating a single-layer meta-surface structure,exhibits great application potential in many practical applications.

关 键 词：太赫兹超表面 人工表面等离子体激元 高Q谐振 传感 

分 类 号：TP394.1[自动化与计算机技术—计算机应用技术] TH691.9[自动化与计算机技术—计算机科学与技术]