Observation of spatiotemporal dynamics for topological surface states with on-demand dispersion  

作　　者：ZHANYUAN ZHANG ZHIHAO LAN PENGBAI XU LEIMING WU MENGLIN L.N.CHEN WEI E.I.SHA YI XU YUWEN QIN 

机构地区：[1]Key Laboratory of Photonic Technology for Integrated Sensing and Communication,Ministry of Education,Institute of Advanced Photonic Technology,School of Information Engineering,Guangdong University of Technology,Guangzhou 510006,China [2]Department of Electronic and Electrical Engineering,University College London,London WC1E7JE,UK [3]Guangdong Provincial Key Laboratory of Information Photonics Technology,Institute of Advanced Photonic Technology,School of Information Engineering,Guangdong University of Technology,Guangzhou 510006,China [4]Department of Electrical and Electronic Engineering,The Hong Kong Polytechnic University,Hong Kong,China [5]Key Laboratory of Micro-Nano Electronic Devices and Smart Systems of Zhejiang Province,College of Information Science and Electronic Engineering,Zhejiang University,Hangzhou 310027,China

出　　处：《Photonics Research》2024年第12期2919-2930,共12页光子学研究(英文版)

基　　金：National Natural Science Foundation of China(62222505,62335005);Guangdong Introducing Innovative,Entrepreneurial Teams of the Pearl River Talent Recruitment Program(2019ZT08X340).

摘　　要：Dispersion management in guided wave optics is of vital importance for various applications.Topological photonics opens new horizons for manipulating unidirectional guided waves utilizing edge states.However,the experimental observation of spatiotemporal dynamics for guided waves with on-demand dispersion in topological photonic crystal is an important issue awaiting exploitation.Herein,we experimentally investigate the spatiotemporal properties of topological surface states with on-demand dispersion,where they are supported by a truncated valley photonic crystal with surface modulation.We observe the electromagnetic dynamics of surface states with typical dispersions,where dynamical trapping of an electromagnetic pulse mediated by the unidirectional surface state with flat dispersion and backward beam routing using reversed dispersion properties are achieved in photonic crystal slabs.Both numerical and experimental results substantiate the ultimate dispersion management for topological surface states,which could pave new ways for the manipulation of electromagnetic waves on the surface of photonic devices.

关 键 词：DISPERSION SURFACE DYNAMICS 

分 类 号：O469[理学—凝聚态物理]