Investigation of edge states variation in valley photonic crystals by modulating the refractive index of domain walls  

作　　者：ZHANG Run ZHONG Xingli LIN Zhongxi QIU Weibin SU Hui 

机构地区：[1]Key Laboratory of Optoelectronic Materials Chemistry and Physics,Collaborative Innovation Center for Optoelectronic Semiconductors and Efficient Devices,Fujian Institute of Research on the Structure of Matter,Chinese Academy of Science,Fuzhou,350002,China [2]University of Chinese Academy of Sciences,Chinese Academy of Sciences,Beijing,100039,China [3]College of Information Science and Engineering,Huaqiao University,Xiamen,361021,China [4]Fujian Science&Technology Innovation Laboratory for Optoelectronic Information of China,Fuzhou,350108,China

出　　处：《Optoelectronics Letters》2025年第3期160-166,共7页光电子快报(英文版)

基　　金：supported by the Self-Deployment Project Research Program of the Haixi Institutes,Chinese Academy of Sciences(No.CXZX-2022-GH09);the National Natural Science Foundation of China(No.11774103);the Fujian Science&Technology Innovation Laboratory for Optoelectronic Information of China(No.2021ZR114)。

摘　　要：Realizing the valley Hall effect by breaking the spatial inversion symmetry of photonic systems has become a cutting-edge field of micro-nano-optics,since the valley degree of freedom was introduced into photonic system.Various novel devices based on the domain walls of the valley photonic crystals have also been demonstrated.In this article,we investigate the variation of edge states by the modulation of refractive index within the domain walls,and the geometric difference between the dielectric columns of the sublattices.Straight photonic crystal waveguides with three types of domain walls(bearded,zigzag,armchair)are constructed.Simulation results show that the creation of a double-edge state in the band diagram results in two windows of stable transmission in tunable bands.Our findings might have significant implications in the field of novel optical devices.

关 键 词：modulation refractive index domain walls variation edge states breaking spatial inversion symmetry valley degree freedom photonic crystals geometric difference dielectric columns photonic systems 

分 类 号：O43[机械工程—光学工程] O734[理学—光学]