Refractive index sensing of spoof surface plasmon polaritons excited on graphene strips based on cylindrical dielectric metasurface coupling

Dexian Yan; Jing Cui; Ji Yang; Yi Wang; Xiangjun Li; Le Zhang; Jining Li

Results in Physics (Mar 2024)

Refractive index sensing of spoof surface plasmon polaritons excited on graphene strips based on cylindrical dielectric metasurface coupling

Dexian Yan,
Jing Cui,
Ji Yang,
Yi Wang,
Xiangjun Li,
Le Zhang,
Jining Li

Affiliations

Dexian Yan: Centre for THz Research, China Jiliang University, Hangzhou 310018, Zhejiang, China; Key Laboratory of Electromagnetic Wave Information Technology and Metrology of Zhejiang Province, College of Information Engineering, China Jiliang University, Hangzhou 310018, Zhejiang, China
Jing Cui: Centre for THz Research, China Jiliang University, Hangzhou 310018, Zhejiang, China; Key Laboratory of Electromagnetic Wave Information Technology and Metrology of Zhejiang Province, College of Information Engineering, China Jiliang University, Hangzhou 310018, Zhejiang, China
Ji Yang: Centre for THz Research, China Jiliang University, Hangzhou 310018, Zhejiang, China; Key Laboratory of Electromagnetic Wave Information Technology and Metrology of Zhejiang Province, College of Information Engineering, China Jiliang University, Hangzhou 310018, Zhejiang, China
Yi Wang: Key Laboratory of Electromagnetic Wave Information Technology and Metrology of Zhejiang Province, College of Information Engineering, China Jiliang University, Hangzhou 310018, Zhejiang, China; Corresponding authors at: Key Laboratory of Electromagnetic Wave Information Technology and Metrology of Zhejiang Province, China Jiliang University, Hangzhou 310018, Zhejiang, China (Y. Wang, X. Li).
Xiangjun Li: Centre for THz Research, China Jiliang University, Hangzhou 310018, Zhejiang, China; Key Laboratory of Electromagnetic Wave Information Technology and Metrology of Zhejiang Province, College of Information Engineering, China Jiliang University, Hangzhou 310018, Zhejiang, China; Corresponding authors at: Key Laboratory of Electromagnetic Wave Information Technology and Metrology of Zhejiang Province, China Jiliang University, Hangzhou 310018, Zhejiang, China (Y. Wang, X. Li).
Le Zhang: Centre for THz Research, China Jiliang University, Hangzhou 310018, Zhejiang, China; Key Laboratory of Electromagnetic Wave Information Technology and Metrology of Zhejiang Province, College of Information Engineering, China Jiliang University, Hangzhou 310018, Zhejiang, China
Jining Li: College of Precision Instrument and Optoelectronic Engineering, Tianjin University, Tianjin 300072, Tianjin, China

Journal volume & issue: Vol. 58
p. 107539

Abstract

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In this paper, we present a novel terahertz plasmonic sensing concept that utilizes a metasurface coupler to excite spoof surface plasmon polaritons (SSPs) modes on graphene strips. The dielectric metasurface unit cell consists of two silicon cylindrical rods with different radii on a quartz substrate. Vertically incident terahertz waves are deflected by the metasurface, resulting in a transverse wave-vector within the substrate that matches the SSPs wave-vector supported by the graphene strips. This enables efficient excitation of SSPs modes on the graphene strips surface, leading to absorption resonances in the range of 0.420–0.430 THz with a high quality (Q) factor of 152. We then applied this device for refractive index sensing, and the investigation results indicate that the high Q resonances in the absorption spectrum experience shifts with changes in the refractive index of the target substance, with a sensitivity of 110 GHz/RIU. The designed structure in this study exhibits significant potential for applications in trace substance absorption spectrum detection.

Published in Results in Physics

ISSN: 2211-3797 (Online)
Publisher: Elsevier
Country of publisher: Netherlands
LCC subjects: Science: Physics
Website: http://www.journals.elsevier.com/results-in-physics/

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