Topological slow light and rainbow trapping of surface wave in valley photonic crystal bounded by air  

作　　者：Shuheng Chen Yi Qi Yucen Li Qihao Wang Yuanjiang Xiang 陈书恒;齐奕;李昱岑;王琪皓;项元江(Research Institute of Hunan University in Chongqing,Chongqing 401120,China;School of Physics and Electronics,Hunan University,Changsha 410082,China)

机构地区：[1]Research Institute of Hunan University in Chongqing,Chongqing 401120,China [2]School of Physics and Electronics,Hunan University,Changsha 410082,China

出　　处：《Chinese Physics B》2024年第11期462-466,共5页中国物理B（英文版）

基　　金：Project supported by the National Natural Science Foundation of China(Grant No.12374302);the Natural Science Foundation of Chongqing(Grant No.CSTB2022NSCQMSX0872).

摘　　要：Topological slow light and rainbow trapping tend to rely on large-scale interface structure in previous research work,which have restricted further miniaturization.In this work,we propose a method to realize slow light and rainbow trapping at the zigzag edge of a single valley photonic crystals(VPCs)bounded by air,which is very different from previous studies where rainbow trapping is supported at the interface separating two VPCs with inversion symmetry.By constructing the VPC–air boundaries and VPC–VPC interfaces experimentally,we have observed the topologically protected rainbow trapping simultaneously at the external and internal boundary.This work provides a feasible platform for the miniaturized optical communication devices such as optical buffers,optical storage and optical routing.

关 键 词：topological slow light rainbow trapping valley photonic crystals 

分 类 号：O43[机械工程—光学工程]