Excitation of Tunable Dual Quasi-Bound States in the Continuum in Graphene Metasurface and Terahertz Sensing Application

被引：0
作者：
Zhong Huang
Qing Chen
Xiaoxiao Cao
Ji Ding
Chaojun Tang
Zhendong Yan
Jing Chen
机构：
[1] Jiangsu Second Normal University,School of Physics and Information Engineering
[2] Jiangsu Province Engineering Research Center of Basic Education Big Data Application,Center for Optics and Optoelectronics Research, Collaborative Innovation Center for Information Technology in Biological and Medical Physics, College of Science
[3] Zhejiang University of Technology,College of Science
[4] Nanjing Forestry University,Institute of Advanced Photonics Technology, College of Electronic and Optical Engineering & College of Microelectronics
[5] Nanjing University of Posts and Telecommunications,undefined
来源：
Plasmonics | 2023年 / 18卷
关键词：
Graphene metasurface; Bound state in the continuum (BIC); Plasmonic quasi-BIC; Terahertz sensing; Tunable;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
This study proposes an all-graphene metasurface supporting dual band symmetric bound state in the continuum (BIC) in the terahertz (THz) range for the first time. The structure consists of a unit cell containing a double-gap split ring resonator periodically on a dielectric substrate. By introducing symmetry breaking, two plasmonic quasi-BIC (Q-BIC) transmission dips are observed with finite Q-factors and high modulation depth. Simulation and analysis results simultaneously exhibit that the Q-factors of Q-BICs follow an inverse square dependency with the asymmetry degree. Via changing the graphene’s chemical potential, the Q-BICs’ operating frequency range can be actively expanded. The dual Q-BICs are immune to the variation of incident angle and have a significant slow light effect with time delay up to 23.8 ps. In addition, the sensing performance in THz region is investigated. A maximum sensitivity of 267.5 GHz/RIU is obtained with a FOM of 24.08 RIU−1. Our work shows an alternative way to design the class of tunable Q-BIC metasurface, which will provide a valuable reference for future dynamic sensor and other fields.
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页码：2285 / 2293
页数：8
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