Mode coupling with Fabry-Perot modes in photonic crystal slabs  

作　　者：秦恳 胡鹏 刘杰 向红 韩德专 Ken Qin;Peng Hu;Jie Liu;Hong Xiang;De-Zhuan Han(Department of Physics and Chongqing Key Laboratory for Strongly Coupled Physics,Chongqing University,Chongqing 401331,China;School of Science,Chongqing Key Laboratory of New Energy Storage Materials and Devices,Chongqing University of Technology,Chongqing 400054,China)

机构地区：[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

出　　处：《Chinese Physics B》2024年第8期90-94,共5页中国物理B（英文版）

基　　金：Project supported by the National Natural Science Foundation of China (Grant Nos.12074049 and 12347101)。

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 

分 类 号：O43[机械工程—光学工程]