Frequency-dependent selectively oriented edge state topological transport  

作　　者：Jiajun Ma Chunmei Ouyang Yuting Yang Xinyue Qian Li Niu Yi Liu Quan Xu Yanfeng Li Zhen Tian Jianqiang Gu Jiaguang Han Weili Zhang 

机构地区：[1]Tianjin University,Center for Terahertz Waves and College of Precision Instrument and Optoelectronics Engineering,and Key Laboratory of Optoelectronics Information and Technology,Tianjin,China [2]China University of Mining and Technology,School of Materials Science and Physics,Xuzhou,China [3]Guilin University of Electronic Technology,Guangxi Key Laboratory of Optoelectronic Information Processing,School of Optoelectronic Engineering,Guilin,China [4]Oklahoma State University,School of Electrical and Computer Engineering,Stillwater,Oklahoma,United States

出　　处：《Advanced Photonics Nexus》2024年第3期32-39,共8页先进光子学通讯（英文）

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.62175180,62005193,11874245,and 12004425);the National Key Research and Development Program of China(Grant No.2017YFA0701004);the Natural Science Foundation of Jiangsu Province(Grant No.BK20200630).

摘　　要：Valley topological photonic crystals(TPCs),which are robust against local disorders and structural defects,have attracted great research interest,from theoretical verification to technical applications.However,previous works mostly focused on the robustness of topologically protected edge states and little attention was paid to the importance of the photonic bandgaps(PBGs),which hinders the implementation of various multifrequency functional topological photonic devices.Here,by systematically studying the relationship between the degree of symmetry breaking and the working bandwidth of the edge states,we present spoof surface plasmon polariton valley TPCs with broadband edge states and engineered PBGs,where the operation frequency is easy to adjust.Furthermore,by connecting valley TPCs operating at different frequencies,a broadband multifunctional frequency-dependent topological photonic device with selectively directional light transmission is fabricated and experimentally demonstrated,achieving the functions of wavelength division multiplexing and add–drop multiplexing.We provide an effective and insightful method for building multi-frequency topological photonic devices.

关 键 词：multi-frequency topological device photonic valley Hall effect valley edge state photonic bandgap. 

分 类 号：TN2[电子电信—物理电子学]