Interface state-based bound states in continuum and below-continuum-resonance modes with high-Q factors in the rotational periodic system  

作　　者：杨嘉玲 史奥芊 彭宇宸 彭鹏 刘建军 Jialing Yang;Aoqian Shi;Yuchen Peng;Peng Peng;Jianjun Liu(Key Laboratory for Micro/Nano Optoelectronic Devices of Ministry of Education,School of Physics and Electronics,Hunan University,Changsha 410082,China;Greater Bay Area Institute for Innovation,Hunan University,Guangzhou 511300,China)

机构地区：[1]Key Laboratory for Micro/Nano Optoelectronic Devices of Ministry of Education,School of Physics and Electronics,Hunan University,Changsha 410082,China [2]Greater Bay Area Institute for Innovation,Hunan University,Guangzhou 511300,China

出　　处：《Chinese Physics B》2024年第8期288-293,共6页中国物理B（英文版）

基　　金：supported by the National Natural Science Foundation of China (Grant Nos.61405058 and 62075059);the Natural Science Foundation of Hunan Province (Grant Nos.2017JJ2048 and 2020JJ4161);the Scientific Research Foundation of Hunan Provincial Education Department (Grant No.21A0013);the Open Project of State Key Laboratory of Advanced Optical Communication Systems and Networks of China (Grant No.2024GZKF20);the Guangdong Basic and Applied Basic Research Foundation (Grant No.2024A1515011353)。

摘　　要：We have introduced a new approach to calculate the orbital angular momentum(OAM)of bound states in continuum(BICs)and below-continuum-resonance(BCR)modes in the rotational periodic system nested inside and outside by transforming the Bloch wave number from the translational periodic system.We extensively classify and study these BICs and BCR modes,which exhibit high-quality(high-Q)factors,in different regions relative to the interface of the system.These BICs and BCR modes with a high-Q factor have been studied in detail based on distinctive structural parameters and scattering theory.The outcomes of this research break the periodic limitation of interface state-based BICs,and realize more and higher symmetry interface state-based BICs and BCR modes.Moreover,we can control the region where light is captured by adjusting the frequency,and show that the Q factor of BICs is more closely related to the ordinal number of rings and the rotational symmetry number of the system.

关 键 词：bound states in the continuum below continuum resonance modes high-quality factors 

分 类 号：O469[理学—凝聚态物理]