Active control of terahertz quasi-BIC and asymmetric transmission in a liquid-crystalintegrated metasurface

作     者：SHI-TONG XU JUNXING FAN ZHANQIANG XUE TONG SUN GUOMING LI JIANDI LI DAN LU LONGQING CONG SHI-TONG XU;JUNXING FAN;ZHANQIANG XUE;TONG SUN;GUOMING LI;JIANDI LI;DAN LU;LONGQING CONG

作者机构：Shandong Provincial Key Laboratory of Laser Polarization and Information TechnologySchool of Physics and EngineeringQufu Normal UniversityQufu 273165China Department of Electrical and Electronic EngineeringSouthern University of Science and TechnologyShenzhen 518055China 

出 版 物：《Photonics Research》 (光子学研究（英文版）)

年 卷 期：2024年第12卷第10期

页      面：2207-2213页

核心收录：

学科分类：070207[理学-光学] 07[理学] 08[工学] 0803[工学-光学工程] 0702[理学-物理学] 

基　　金：National Natural Science Foundation of China(62005143,62175099,62335011) Basic and Applied Basic Research Foundation of Guangdong Province(2023A1515011085) Shenzhen Science and Technology Innovation Program(20220815151149004,20230807093617036,JSGGKQTD20221101115656030) Regular Undergraduate University Teacher Visiting and Training Funding of Shandong Province 

主　　题：field quasi asymmetric 

摘      要：Quasi-bound states in the continuum(quasi-BICs)offer an excellent platform for the flexible and efficient control of light-matter interactions by breaking the structural *** active quasi-BIC device has great application potential in fields such as optical sensing,nonlinear optics,and ***,we experimentally demonstrate an active terahertz(THz)quasi-BIC device induced by the polarization conversion in a liquid crystal(LC)-integrated metasurface,which consists of a symmetrically broken double-gap split ring resonator(DSRR),an LC layer,and double graphite *** the process of LC orientation control under the external field,the device realizes the active control from the OFF state to the ON *** the OFF state,the LC has no polarization conversion effect,and the device behaves in a non-resonant state;but for the ON state,the device exhibits obvious quasi-BIC ***,we achieve asymmetric transmission based on polarization-induced quasiBIC modulation precisely at the quasi-BIC resonance position,and its isolation can be controlled by the external *** study on dynamic quasi-BIC by the LC-integrated metasurface introduces a very promising route for active THz devices,which guarantees potential applications for THz communications,switching,and sensing systems.