Dual-function switchable terahertz surface plasmon device driven by a GST metasurface  

作　　者：GUANGHONG XU QUAN LI HAO SU YISHENG DONG GUANXUAN GUO HUIRONG WANG HAI HUANG TAI CHEN SHUANG WANG XUEQIAN ZHANG ZHEN TIAN 

机构地区：[1]School of Electronic Engineering,Tianjin University of Technology and Education,Tianjin 300222,China [2]Center for TerahertzWaves,College of Precision Instrument and Optoelectronics Engineering,and Key Laboratory of Optoelectronics Information and Technology(Ministry of Education),Tianjin University,Tianjin 300072,China

出　　处：《Photonics Research》2025年第1期98-105,共8页光子学研究(英文版)

基　　金：National Natural Science Foundation of China(62275195,62075158,62235013,62335012);Scientific Research Plan Project of Tianjin Municipal Education Commission(2022ZD012,2020KJ125,2022KJ119);Guangxi Key Laboratory of Optoelectronic Information Processing(GD22201).

摘　　要：Surface plasmons(SPs)are one of the most effective information carriers for on-chip systems due to their twodimensional propagation properties.Benefitting from the highly flexible designability,metasurfaces have emerged as a promising route in realizing SP devices.However,related studies are mainly focused on passive devices.Here,by introducing nonvolatile phase-change material Ge_(2)Sb_(2)Te_(5)(GST)into the metasurface design,we experimentally demonstrate a dual-function switchable SP device in the terahertz regime.Specifically,the device works as a spin-dependent directional plane-wave SP coupler when GST is in the amorphous state,while it works as a spin-dependent directional SP Fresnel zone plate(FZP)when GST is in the crystalline state.The states of GST are switched back and forth using thermal excitation and nanosecond laser illumination,respectively.Our method is simple and robust,and can find broad applications in on-chip photonic devices.

关 键 词：SWITCHED FUNCTION surface 

分 类 号：O441.4[理学—电磁学] O53[理学—物理]