Dynamic bifunctional THz metasurface via dual-mode decoupling  

作　　者：XUAN CONG HONGXIN ZENG SHIQI WANG QIWU SHI SHIXIONG LIANG JIANDONG SUN SEN GONG FENG LAN ZIQIANG YANG YAXIN ZHANG 

机构地区：[1]Terahertz Science and Technology Research Center,University of Electronic Science and Technology of China,Chengdu 610000,China [2]College of Materials Science and Engineering,Sichuan University,Chengdu 610065,China [3]National Key Laboratory of Application Specific Integrated Circuit,Hebei Semiconductor Research Institute,Shijiazhuang 050051,China [4]Key Laboratory of Nanodevices and Applications,Suzhou Institute of Nano-Tech and Nano-Bionics(SINANO),Chinese Academy of Sciences,Suzhou 215123,China [5]Yangtze Delta Region Institute(HuZhou),University of Electronic Science and Technology of China,Huzhou 313001,China

出　　处：《Photonics Research》2022年第9期2008-2014,共7页光子学研究（英文版）

基　　金：National Key Research and Development Program of China(2021YFB1401000,2018YFB1801503);National Natural Science Foundation of China(62101111,61931006,U20A20212,61901093,61871419,61771327,61921002);Sichuan Science and Technology Program(2020JDRC0028);China Postdoctoral Science Foundation(2020M683285)。

摘　　要：Metasurfaces have powerful light field manipulation capabilities and have been researched and developed extensively in various fields.With an increasing demand for diverse functionalities,terahertz(THz)metasurfaces are also expanding their domain.In particular,integrating different functionalities into a single device is a compelling domain in metasurfaces.In this work,we demonstrate a functionally decoupled THz metasurface that can incorporate any two functions into one metasurface and switch dynamically through external excitation.This proposed metasurface is formed by the combination of split-ring resonators and phase change material vanadium dioxide(VO_(2)).It operates in the single-ring resonant mode and double-ring resonant mode with varying VO_(2)in insulating and metallic states,respectively.More importantly,the phase modulation is independent in two operating modes,and both cover a 360°cross-polarized phase with efficient polarization conversion.This characteristic makes it obtain arbitrary independent phase information on the metasurface with different modes to switch dual functions dynamically.Here,we experimentally demonstrate the functions of a tunable focal length and large-angle focus deflection of a THz off-axis parabolic mirror to verify the dual-function switching characteristics of the functionally decoupled metasurface.The functionally decoupled metasurface developed in this work broadens the way for the research and application of multifunctional modulation devices in the THz band.

关 键 词：surface. FUNCTIONAL RESONANT 

分 类 号：O441.4[理学—电磁学] TB34[理学—物理]