Strong light–matter coupling between excitons and chiral quasi-bound states in the continuum in van der Waals metasurfaces  

作　　者：Zhonghong Shi Houjiao Zhang Zhang-Kai Zhou 史忠宏;张后交;周张凯(State Key Laboratory of Optoelectronic Materials and Technologies,School of Physics,Sun Yat-sen University,Guangzhou 510275,China)

机构地区：[1]State Key Laboratory of Optoelectronic Materials and Technologies,School of Physics,Sun Yat-sen University,Guangzhou 510275,China

出　　处：《Chinese Optics Letters》2024年第10期118-127,共10页中国光学快报（英文版）

基　　金：supported by the National Key R&D Program of China(No.2021YFA1400804);the National Natural Science Foundation of China(Nos.12222415 and 12334017);the Guangdong Provincial Natural Science Foundation(No.2024B1515040013);the Guangdong Provincial Quantum Science Strategic Initiative(No.GDZX2305005)。

摘　　要：The study of strong coupling between photonic cavities and excitons has brought about significant advances,varying from fundamental physics to applied science.However,there are several challenges hindering its further development,including obtaining photonic modes with both low room-temperature loss and high electric field(EF)enhancements,the difficulty of precisely transferring exciton materials into the photonic cavity,and the urgent need for additional manipulation approaches.In order to overcome these challenges simultaneously,we present a theoretical strong coupling system based on the chiral metasurfaces that are built by the excitonic van der Waals material of WSe_(2)and can support the quasi-bound states in the continuum(q-BIC)mode.The q-BIC mode can sustain EF enhancements over 80 times with loss smaller than10 meV,and the strong coupling between q-BIC mode and WSe_(2)excitons can be naturally realized without material transferring.Furthermore,a large chirality beyond 0.98 can be obtained in this strong coupling system,making the circular polarization of excitation light an effective parameter to control the generation of coherent states in this metasurface system.Our results can benefit the further development of strong coupling research,shedding light onto the exploration of new quantum devices.

关 键 词：strong coupling CHIRALITY bound states in the continuum metasurface 

分 类 号：O437[机械工程—光学工程]