Super-reflector enabled by non-interleaved spin-momentum-multiplexed metasurface  

作　　者：He-Xiu Xu Guangwei Hu Xianghong Kong Yanzhang Shao Patrice Genevet Cheng-Wei Qiu 

机构地区：[1]Air and Missile Defense College,Air Force Engineering University,710051 Xi'an,China [2]School of Electrical and Electronic Engineering,Nanyang Technological University,Singapore 639798,Singapore [3]Department of Electrical and Computer Engineering,National University of Singapore,Singapore 117583,Singapore [4]UniversitéCote d'Azur,CNRS,Centre de Recherche sur l'Hétéro-Epitaxie et ses Applications(CRHEA),06560 Valbonne,France

出　　处：《Light(Science & Applications)》2023年第4期636-645,共10页光（科学与应用)（英文版）

基　　金：supported by the National Natural Science Foundation of China under Grant No.62171459;the National Defense Foundation of China under Grant No.2019-JCJQ-JJ-081;Key Program of Natural Science Foundation of Shaanxi Province under Grant No.2020JZ-33,and also the Special Talents Support Program of Shaanxi Province for Young Top Talents.

摘　　要：Electromagnetic wave multiplexing,especially for that occurring at different incidences(spatial-frequency multiplexing),is pivotal for ultrathin multifunctional interfaces and high-capacity information processing and communication.It is yet extremely challenging based on passive and compact wave elements,since the wave excitation and scattering channels are exclusively coupled through gradient phases and hence momentum matching condition at the interface.Here,we propose a spin-momentum multiplexed paradigm called a super-reflector enabling on-demand control of both retroreflections and anomalous reflections using a non-interleaved single-celled metasurface.By multiplexing four channels connecting two spin states excited onto each input of three spatial frequencies,a total of twelve channels are engineered,among which three are retroreflected channels and the residual are anomalous reflection ones.Our compound multiplexed super-reflector allows five degrees of freedom in circular polarization Jones'matrix,approaching the intrinsic upper limit of such planar metasurface.The concept has been experimentally verified by a proof-of-concept super-reflector at microwave frequency,showcasing twelve reflected beams and a high efficiency exceeding 90.6%defined as the ratio of reflected power to incidence for each channel beam.Our strategy opens a new avenue for angle multiplexing and angle-resolved metadevices toward the capacity limit of 2D planar Jones'matrix.

关 键 词：SURFACE MOMENTUM reflected 

分 类 号：O43[机械工程—光学工程]