All-dielectric terahertz
metasurface governed by bound states in the continuum with high-Q factor

doi:10.19682/j.cnki.1005-8885.2024.0003

中国邮电高校学报(英文) ›› 2024, Vol. 31 ›› Issue (2): 44-54.doi: 10.19682/j.cnki.1005-8885.2024.0003

所属专题：集成电路

• Terahertz and Microwave Microsystem • 上一篇下一篇

All-dielectric terahertz metasurface governed by bound states in the continuum with high-Q factor

李琨¹,赵栩¹,王猛¹,贾兴宁²,赵睿琪³,逯贵祯⁴

1. 天津理工大学
2. 宁夏大学
3. 中国科学院
4. 中国传媒大学信息工程学院

收稿日期:2023-11-28 修回日期:2024-03-09 出版日期:2024-04-30 发布日期:2024-04-30
通讯作者: 王猛 E-mail:wangmeng1993@email.tjut.edu.cn
基金资助:
宁夏自然科学基金;宁夏重点研发（引才专项）

All-dielectric terahertz metasurface governed by bound states in the continuum with high-Q factor

Received:2023-11-28 Revised:2024-03-09 Online:2024-04-30 Published:2024-04-30
Contact: Meng WANG E-mail:wangmeng1993@email.tjut.edu.cn

摘要/Abstract

摘要：

The method of terahertz (THz) resonance with a high-quality (high-Q) factor offers a vital physical mechanism for metasurface sensors and other high-Q factor applications. However, it is challenging to excite the resonance with a high-Q factor in metasurfaces with proper sensitivity as well as figure of merit (FOM) values. Here, an all-dielectric metasurface composed of two asymmetrical rectangular blocks is suggested. Quartz and silicon are the materials applied for the substrate and cuboids respectively. The distinct resonance governed by bound states in the continuum (BIC) is excited by forming an asymmetric cluster by a novel hybrid method of cutting and moving the cuboids. The investigation focuses on analyzing the transmission spectra of the metasurface under different variations in structural parameters and the loss of silicon refractive index. When the proposed defective metasurface serves as a transmittance sensor, it shows a Q factor of 1.08×10⁴ and achieves a FOM up to 4.8×10⁶, which is obtained under the asymmetric parameter equalling 1 μm. Simultaneously, the proposed defective metasurface is sensitive to small changes in refractive index. When the thickness of the analyte is 180 μm, the sensitivity reaches a maximum value of 578 GHz / RIU. Hence, the proposed defective metasurface exhibits an extensive number of possible applications in the filters, biomedical diagnosis, security screening, and so on.

关键词: 太赫兹超表面|Q因子|连续域束缚态|品质因数

Abstract:

Key words: Terahertz Metasurface| High-quality Factor| Bound states in the continuum| Figure of merit

中图分类号:

O441.4

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All-dielectric terahertz metasurface governed by bound states in the continuum with high-Q factor

All-dielectric terahertz metasurface governed by bound states in the continuum with high-Q factor

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