Investigation of quasi-bound states in the continuum in terahertz metal complementary periodic cross-shaped resonators

Dejun Liu,Lin Chen,Lele Wang,Feng Liu,Xiaoyong He,Feng Wu

doi:10.1109/irmmw-thz50926.2021.9566931

Investigation of quasi-bound states in the continuum in terahertz metal complementary periodic cross-shaped resonators

Dejun Liu, Lin Chen + Show 4 more

https://doi.org/10.1109/irmmw-thz50926.2021.9566931

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Publication Date: Aug 29, 2021

Affiliation: Shanghai Normal University, University of Shanghai for Science and Technology, Guangdong Polytechnic Normal University

#Quasi-bound States #Ultra-sensitive Sensors + Show 8 more

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Abstract

We numerically and experimentally demonstrate quasi-bound states in the continuum (BICs) in the free-standing metal complementary periodic cross-shaped resonators (CPCRs). Such induced quasi-BICs arise from the broken symmetry in CPCRs. By slightly breaking mirror symmetry through reducing the length of one arm in CPCRs, the measured Q factor of the quasi-BICs can reach 102, which is significantly high compared with that of the conventional modes and could even be improved by further reducing the structural asymmetry factor. The sharp quasi-BICs realized in the structure may immediately boost the exploration of ultra-narrowband filters and ultra-sensitive sensors at terahertz frequencies.

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