Spin-decoupled meta-coupler empowered multiplexing and multifunction of guided wave radiation  

作　　者：BIN FANG ZHIZHANG WANG YANTAO LI JITAO JI KELEI XI QINGQING CHENG FANGZHOU SHU ZHONGWEI JIN ZHI HONG CHUNLIAN ZHAN CHANGYU SHEN TAO LI 

机构地区：[1]College of Optical and Electronic Technology,Centre for THz Research,China Jiliang University,Hangzhou 310018,China [2]National Laboratory of Solid State Microstructures,College of Engineering and Applied Sciences,Nanjing University,Nanjing 210093,China [3]School of Optical-Electrical and Computer Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China

出　　处：《Photonics Research》2023年第12期2194-2201,共8页光子学研究（英文版）

基　　金：National Natural Science Foundation of China(12204446,12174186,12174260,12274386,12004362);National Key Research and Development Program of China(2022YFA1404301);Natural Science Foundation of Zhejiang Province(LY22A040006,LY21F050006)。

摘　　要：Employing couplers to convert guided waves into free-space modes and flexibly control their wavefront is one of the key technologies in chip-integrated displays and communications.Traditional couplers are mainly composed of gratings,which have limitations in footprint,bandwidth,as well as controllability.Though the resonant/geometric metasurface newly emerges as a promising interface for bridging guided waves with free-space ones,it either relies on complex optimizations of multiple parameters,or is subject to the locked phase response of opposite spins,both of which hinder the functional diversity and practical multiplexing capability.Here,we propose and experimentally demonstrate an alternative with a spin-decoupled meta-coupler,simultaneously integrating triple functions of guided wave radiation,polarization demultiplexing,and dual-channel wavefront manipulation into a single device.By endowing polarization-dependent functionalities into a pure geometric metasurface,the out-coupled left-handed and right-handed circular polarization guided waves intelligently identify the predesigned phase modulation and reconstruct desired wavefronts,like bifocal focusing and holography multiplexing,with a polarization extinction ratio over 13.4 dB in experiments.We envision that the robust,broadband,and multifunctional meta-coupler could pave a way for the development of versatile multiplexed waveguide-based devices.

关 键 词：wave integrating VERSATILE 

分 类 号：TN622[电子电信—电路与系统]