中国物理B ›› 2024, Vol. 33 ›› Issue (8): 84205-084205.doi: 10.1088/1674-1056/ad4ff8

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Mode coupling with Fabry-Perot modes in photonic crystal slabs

Ken Qin(秦恳)1, Peng Hu(胡鹏)2, Jie Liu(刘杰)1, Hong Xiang(向红)1,†, and De-Zhuan Han(韩德专)1,‡   

  1. 1 Department of Physics and Chongqing Key Laboratory for Strongly Coupled Physics, Chongqing University, Chongqing 401331, China;
    2 School of Science, Chongqing Key Laboratory of New Energy Storage Materials and Devices, Chongqing University of Technology, Chongqing 400054, China
  • 收稿日期:2024-04-13 修回日期:2024-05-22 出版日期:2024-08-15 发布日期:2024-07-15
  • 通讯作者: Hong Xiang, De-Zhuan Han E-mail:xhong@cqu.edu.cn;dzhan@cqu.edu.cn
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 12074049 and 12347101).

Mode coupling with Fabry-Perot modes in photonic crystal slabs

Ken Qin(秦恳)1, Peng Hu(胡鹏)2, Jie Liu(刘杰)1, Hong Xiang(向红)1,†, and De-Zhuan Han(韩德专)1,‡   

  1. 1 Department of Physics and Chongqing Key Laboratory for Strongly Coupled Physics, Chongqing University, Chongqing 401331, China;
    2 School of Science, Chongqing Key Laboratory of New Energy Storage Materials and Devices, Chongqing University of Technology, Chongqing 400054, China
  • Received:2024-04-13 Revised:2024-05-22 Online:2024-08-15 Published:2024-07-15
  • Contact: Hong Xiang, De-Zhuan Han E-mail:xhong@cqu.edu.cn;dzhan@cqu.edu.cn
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 12074049 and 12347101).

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摘要： Fabry-Perot (FP) modes are a class of fundamental resonances in photonic crystal (PhC) slabs. Owing to their low quality factors, FP modes are frequently considered as background fields with their resonance nature being neglected. Nevertheless, FP modes can play important roles in some phenomena, as exemplified by their coupling with guided resonance (GR) modes to achieve bound states in the continuum (BIC). Here, we further demonstrate the genuine resonance mode capability of FP modes PhC slabs. Firstly, we utilize temporal coupled-mode theory to obtain the transmittance of a PhC slab based on the FP modes. Secondly, we construct exceptional points (EPs) in both momentum and parameter spaces through the coupling of FP and GR modes. Furthermore, we identify a Fermi arc connecting two EPs and discuss the far-field polarization topology. This work elucidates that the widespread FPs in PhC slabs can serve as genuine resonant modes, facilitating the realization of desired functionalities through mode coupling.

关键词: Fabry-Perot mode, photonic crystal slab, mode coupling, exceptional point

Abstract: Fabry-Perot (FP) modes are a class of fundamental resonances in photonic crystal (PhC) slabs. Owing to their low quality factors, FP modes are frequently considered as background fields with their resonance nature being neglected. Nevertheless, FP modes can play important roles in some phenomena, as exemplified by their coupling with guided resonance (GR) modes to achieve bound states in the continuum (BIC). Here, we further demonstrate the genuine resonance mode capability of FP modes PhC slabs. Firstly, we utilize temporal coupled-mode theory to obtain the transmittance of a PhC slab based on the FP modes. Secondly, we construct exceptional points (EPs) in both momentum and parameter spaces through the coupling of FP and GR modes. Furthermore, we identify a Fermi arc connecting two EPs and discuss the far-field polarization topology. This work elucidates that the widespread FPs in PhC slabs can serve as genuine resonant modes, facilitating the realization of desired functionalities through mode coupling.

Key words: Fabry-Perot mode, photonic crystal slab, mode coupling, exceptional point

中图分类号:  (Polarization)

  • 42.25.Ja
42.25.Bs (Wave propagation, transmission and absorption) 78.67.Pt (Multilayers; superlattices; photonic structures; metamaterials) 78.67.-n (Optical properties of low-dimensional, mesoscopic, and nanoscale materials and structures)