文献类型：期刊文献

英文题名：Double-Strip Array-Based Metasurfaces with BICs for Terahertz Thin Membrane Detection

作者：Shen, Yanchun[1];Wang, Jinlan[1];Sheng, Hongyu[2];Li, Xiaoming[1];Yang, Jing[1];Liu, Hongmei[1];Liu, Dejun[3]

第一作者：Shen, Yanchun

通讯作者：Shen, YC[1];Liu, DJ[2]

机构：[1]Guangzhou Railway Polytech, Coll Informat Engn, Guangzhou 511300, Peoples R China;[2]Beijing Union Univ, Coll Robot, Beijing 100101, Peoples R China;[3]Shanghai Normal Univ, Dept Phys, Shanghai 200234, Peoples R China

第一机构：Guangzhou Railway Polytech, Coll Informat Engn, Guangzhou 511300, Peoples R China

通讯机构：[1]corresponding author), Guangzhou Railway Polytech, Coll Informat Engn, Guangzhou 511300, Peoples R China;[2]corresponding author), Shanghai Normal Univ, Dept Phys, Shanghai 200234, Peoples R China.

年份：2024

卷号：15

期号：1

外文期刊名：MICROMACHINES

收录：;EI(收录号：20240515457280);Scopus(收录号：2-s2.0-85183314657);WOS:【SCI-EXPANDED(收录号:WOS:001150928700001)】；

基金：No Statement Available

语种：英文

外文关键词：terahertz detection; metasurface; bound states in the continuum; high quality

摘要：A double-strip array-based metasurface that supports the sharp quasi-bound states in the continuum (quasi-BICs) is demonstrated in terahertz regions. By tuning the structural parameters of metal strips, the conversion of BICs and quasi-BICs is controllable. The simulated results exhibit an achieved maximum Q-factor for quasi-BICs that exceeds 500, corresponding to a bandwidth that is less than 1 GHz. The optical response of quasi-BICs is mainly affected by the properties of substrates. Resonant frequencies decrease linearly with increasing refractive index. The bandwidth of quasi-BICs decreases to 0.9 GHz when n is 2.2. The sharp quasi-BICs are also sensitive to changes in material absorption. Low-loss materials show higher Q-factors. Thus, the selection of a suitable substrate material will be beneficial in achieving resonance with a high Q value. The sensitivity of DSAs for molecules is assessed using a thin membrane layer. The DSAs show high sensitivity, which achieves a frequency shift of 70 GHz when the thickness of the membrane is 10 mu m, corresponding to a sensitivity of 87.5 GHz/RIU. This metasurface with sharp quasi-BICs is expected to perform well in THz sensing.