Ultrasensitive tunable terahertz lithium niobate metasurface sensing based on bound states in the continuum  

作　　者：XINYAO YU FANGHAO LI TINGTING LANG JIANYUAN QIN XIAO MA 

机构地区：[1]Institute of Optoelectronic Technology,China Jiliang University,Hangzhou 310018,China2 [2]School of Information and Electronic Engineering,Zhejiang University of Science and Technology,Hangzhou 310023,China [3]Center for Terahertz Research,China Jiliang University,Hangzhou 310018,China

出　　处：《Photonics Research》2023年第12期2168-2178,共11页光子学研究（英文版）

基　　金：National Natural Science Foundation of China(52105595);Natural Science Foundation of Zhejiang Province(Q21F050011)。

摘　　要：Lithium niobate’s substantial nonlinear optical and electro-optic coefficients have recently thrust it into the limelight.This study presents a thorough review of bound states in the continuum(BICs)in lithium niobate metasurfaces,also suggesting their potential for sensing applications.We propose an all-dielectric tunable metasurface that offers high Q factor resonances in the terahertz range,triggered by symmetry-protected BICs.With exceptional sensitivity to changes in the refractive index of the surrounding medium,the metasurface can reach a sensitivity as high as 947 GHz/RIU.This paves the way for ultrasensitive tunable terahertz sensors,offering an exciting path for further research.

关 键 词：LITHIUM CONTINUUM exceptional 

分 类 号：O441.4[理学—电磁学] TP212[理学—物理]