Tunable highly sensitive terahertz sensing based on bound states in the continuum in graphene metasurface

Xiaoping Lin; Jing Zhao

doi:10.1117/12.3031815

18 July 2024 Tunable highly sensitive terahertz sensing based on bound states in the continuum in graphene metasurface

Xiaoping Lin, Jing Zhao

Proceedings Volume 13179, International Conference on Optics and Machine Vision (ICOMV 2024); 131790B (2024) https://doi.org/10.1117/12.3031815
Event: International Conference on Optics and Machine Vision (ICOMV 2024), 2024, Nanchang, China

Abstract

A terahertz refractive index sensor with high sensitivity that can be actively adjusted and is controlled by the states in the continuum is designed. The sensor is constructed from an asymmetric graphene double split-ring, and by disrupting the symmetry of the structure, it can transform the resonance into a high-Q leak-mode resonance, which is very sensitive to variations in the surrounding medium’s refractive index. The effects of the chemical potential of graphene, the refractive index of the analyte and the thickness of the analyte on the transmission spectrum were numerically simulated by the finite element method. The results show that the Q-factor of the graphene metasurface reaches 105, its sensitivity is 288 GHz/RIU, and its FOM is 21. The proposed structure has potential applications in the field of highly sensitive photonic sensors in the terahertz range.

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Xiaoping Lin and Jing Zhao "Tunable highly sensitive terahertz sensing based on bound states in the continuum in graphene metasurface", Proc. SPIE 13179, International Conference on Optics and Machine Vision (ICOMV 2024), 131790B (18 July 2024); https://doi.org/10.1117/12.3031815

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KEYWORDS

Graphene

Refractive index

Chemical analysis

Terahertz radiation

Sensors

Electrical conductivity

Millimeter wave sensors

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