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Chin. Phys. B, 2024, Vol. 33(8): 084206    DOI: 10.1088/1674-1056/ad4630
ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS Prev   Next  

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

Jialing Yang(杨嘉玲)1, Aoqian Shi(史奥芊)1, Yuchen Peng(彭宇宸)1, Peng Peng(彭鹏)1, and Jianjun Liu(刘建军)1,2,†
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
Abstract  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.
Keywords:  bound states in the continuum      below continuum resonance modes      high-quality factors  
Received:  25 February 2024      Revised:  24 April 2024      Accepted manuscript online: 
PACS:  42.70.Qs (Photonic bandgap materials)  
  42.60.Da (Resonators, cavities, amplifiers, arrays, and rings)  
  78.67.Pt (Multilayers; superlattices; photonic structures; metamaterials)  
Fund: This work was 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), and 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), and the Guangdong Basic and Applied Basic Research Foundation (Grant No. 2024A1515011353).
Corresponding Authors:  Jianjun Liu     E-mail:  jianjun.liu@hnu.edu.cn

Cite this article: 

Jialing Yang(杨嘉玲), Aoqian Shi(史奥芊), Yuchen Peng(彭宇宸), Peng Peng(彭鹏), and Jianjun Liu(刘建军) Interface state-based bound states in continuum and below-continuum-resonance modes with high-Q factors in the rotational periodic system 2024 Chin. Phys. B 33 084206

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