Enhanced Fano resonance for high-sensitivity sensing based on bound states in the continuum

被引：17

作者：

Feng, Guang ^{[1
]}

Chen, Zhihui ^{[1
]}

Wang, Yang ^{[2
]}

Liu, Xin ^{[1
]}

Liu, Yinshan ^{[1
]}

Liu, Xiao ^{[1
]}

Sun, Fei ^{[1
]}

Yang, Yibiao ^{[1
]}

Chen, Shuqi ^{[3
,4
]}

机构：

[1] Taiyuan Univ Technol, Coll Phys & Optoelect, Key Lab Adv Transducers & Intelligent Control Syst, Minist Educ & Shanxi Prov, Taiyuan 030024, Peoples R China

[2] Shanxi Univ, Inst Biotechnol, Key Lab Chem Biol & Mol Engn, Minist Educ, Taiyuan 030006, Peoples R China

[3] Nankai Univ, Renewable Energy Convers & Storage Ctr, Sch Phys, Key Lab Weak Light Nonlinear Photon,Minist Educ, Tianjin 300071, Peoples R China

[4] Nankai Univ, TEDA Inst Appl Phys, Tianjin 300071, Peoples R China

来源：

CHINESE OPTICS LETTERS | 2023年 / 21卷 / 03期

基金：

中国国家自然科学基金;

关键词：

Fano resonance; bound states in the continuum; terahertz; high-sensitivity sensing; TERAHERTZ; INTERFERENCE; MULTIMODE;

D O I：

10.3788/COL202321.031202

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

Although previously reported terahertz absorbers can achieve high-sensitivity refractive index sensing, the resonant peak is too broad, which leads to a low figure of merit (FOM). Transmissive sensors based on bound states in the continuum (BIC) can achieve high FOM, but they have some limitations in high sensitivity. Herein, we propose a periodic triple parallel metal bars structure to obtain high quality, a strong field, and multiple hot spots by the Friedrich-Wintgen BIC. Numerical results show the sensitivity and FOM can reach 1877 GHz/RIU and 665, respectively. Compared to the previously reported transmissive sensors based on BIC, the sensitivity has been greatly improved.

引用

页数：6

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