太赫兹人工表面等离子体共面激发与高<i>Q</i>传感

严德贤; 程钢; 李尔平; 李向军; 章雪茹; 吴依琳

doi:10.37188/CO.2022-0204

太赫兹人工表面等离子体共面激发与高Q传感

严德贤^{1, 2,},
程钢²,
李尔平^1, ,,
李向军^2,,
章雪茹²,
吴依琳²

1.
浙江大学信息与电子工程学院, 浙江杭州 310058
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

详细信息

中图分类号: TP394.1; TH691.9
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出版历程
- 网络出版日期: 2022-11-22

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

doi: 10.37188/CO.2022-0204

1.
College of Information Science and Electronic Engineering, Zhejiang University, Hangzhou 310027, Zhejiang, China
2.
Key Laboratory of Electromagnetic Wave Information Technology and Metrology of Zhejiang Province, College of Information Engineering, China Jiliang University, Hangzhou 310018, China

Funds: Supported by National Key R&D Program of China (No. 2021YFF0600300); National Natural Science Foundation of China (No. 62001444); Natural Science Foundation of Zhejiang Province (No. LQ20F010009);

More Information

Author Bio:
严德贤（1991—），男，甘肃武威人，博士，副教授，2018年毕业于天津大学获博士学位，浙江大学博士后，主要从事太赫兹微波技术及器件。E-mail：yandexian1991@163.com

李尔平（1962—），男，河北石家庄人，博士，浙江大学求是讲席教授、IEEE会士、国家特聘专家，英国谢菲尔德获电子与信息工程博士学位，主要从事电磁学、5G通信及芯片电磁兼容、等离子纳米光子学等领域研究。E-mail：liep@zju.edu.cn

李向军（1976—），男，山西长治人，博士，副教授，2011年于浙江大学获得博士学位，主要从事太赫兹器件研究。E-mail：xiangjun_li@cjlu.edu.cn

Corresponding author: liep@zju.edu.cn

摘要

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不便等缺点。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，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。其次，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。
- 太赫兹超表面 /
- 人工表面等离子体激元 /
- 高Q谐振 /
- 传感
Abstract:
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 inconvenience of 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 wavevector of grating structures and the wavevector 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 its factor Q 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.
- terahertz meta-surface /
- spoof surface plasmon /
- high Q resonance /
- sensing

HTML全文

图 1 基于光栅耦合实现太赫兹SSP的超表面结构。（a）光栅耦合SSP超表面结构图；（b）超表面单元结构示意图。

Figure 1. The meta-surface structure of the terahertz SSP based on grating coupling. (a) Diagram of the grating-coupled SSP meta-surface structure; (b) Schematic diagram of unit cell structure of the meta-surface.

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图 2 超表面结构及透射性能研究。（a）等效光栅耦合器结构示意图；（b）金属棒单元结构示意图；（c）结构参数a不同时所对应的透射谱；（d）结构参数a不同时对应的光栅及金属棒的色散关系。

Figure 2. Study on the meta-surface structure and transmission properties. (a) Schematic diagram of the equivalent grating coupler; (b) Schematic diagram of the metal bar unit; (c) Transmission spectrum corresponding to the different a; (d) Dispersion characteristics of the grating and metal bar with different a.

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图 3 不同结构参数对光栅耦合超表面结构透射特性的影响。（a）参数a不同时的透射谱；（b）参数b不同时的透射谱；（c）参数a和b同时变化时的透射谱；（d）参数d不同时的透射谱。

Figure 3. Effects of different structural parameters on the transmission spectrum of grating-coupled meta-surface structures. (a) Transmission spectra with different a; (b) Transmission spectra with different b; (c) Transmission spectra with the simultaneous variation of a and b; (d) Transmission spectra with different d.

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图 4 改变结构参数对周期性金属结构色散特性的影响。（a）参数a不同时的色散特性；（b）参数b不同时的色散特性；（c）参数a和b同时变化时的色散特性；（d）参数d不同时的色散特性。

Figure 4. Effects of structural parameters on the dispersion characteristics of periodic metal structures. (a) Dispersion characteristics with different a; (b) Dispersion characteristics with different b; (c) Dispersion characteristics with the simultaneous variation of a and b; (d) Dispersion characteristics with different d.

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图 5 （a）光栅耦合超表面结构实现人工表面等离子体电场分布图；（b）超表面结构的电场分布和表面电流分布。黑色箭头表示表面电流方向。

Figure 5. (a) Electric field distribution of the SSP modes realized by the grating-coupled meta-surface structure. (b) Electric field and surface current distributions of the meta-surface structure at resonant frequency. The black arrows indicate the surface current direction.

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图 6 改变光栅耦合超表面周围的环境折射率所得到的透射率变化以及相应的传感灵敏度。（a）不同折射率所对应的透射谱；（b）计算得到的传感灵敏度。

Figure 6. Changes in transmissivity and corresponding sensing sensitivity obtained by varying the ambient refractive index around the grating-coupled meta-surface. (a) Transmission spectra with different refractive indices; (b) The calculated sensing sensitivity.

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