Dynamic generation of multiplexed vortex beams by a space-time-coding metasurface  

作　　者：PENGCHENG TANG LIMING SI QIANQIAN YUAN JIE TIAN JIAXUAN DENG TIANYU MA XIUE BAO CHONG HE WEIREN ZHU 

机构地区：[1]Beijing Key Laboratory of Millimeter Wave and Terahertz Technology,School of Integrated Circuits and Electronics,Beijing Institute of Technology,Beijing 100081,China [2]Department of Electronic Engineering,Shanghai Jiao Tong University,Shanghai 200240,China

出　　处：《Photonics Research》2025年第1期225-234,共10页光子学研究(英文版)

基　　金：National Key Research and Development Program of China(2022YFF0604801);National Natural Science Foundation of China(62271056,62171186,62201037);Beijing Natural Science Foundation of China-Haidian Original Innovation Joint Fund(L222042);Open Research Fund of State Key Laboratory of Millimeter Waves(K202326);Open Research Fund of State Key Laboratory of Space-Ground Integrated Information Technology(6142221200201);Basic Research Foundation of Beijing Institute of Technology,China(BITBLR2020014);111 Project of China(B14010).

摘　　要：Dynamic generation of multimode vortex waves carrying orbital angular momentum(OAM)utilizing programmable metasurfaces has attracted considerable attention.Yet,it is still a challenge to achieve multiplexed vortex waves with an arbitrary customized mode combination,stemming fundamentally from the discrete control over phase exhibited by current programmable metasurfaces,which are typically constrained to a limited 1-bit or 2-bit discrete resolution.In this paper,we propose,to our knowledge,a new strategy for dynamic generation of multiplexed vortex beams based on a space-time-coding metasurface,capable of quasi-continuous complex-amplitude modulation for harmonic waves.As a proof of concept,a metasurface prototype for generating multiplexed vortex beams with the customized mode composition and power allocation is established based on the transmissive space-time-coding meta-atoms regulated by the field programmable gate array controller.The mode purity of the vortex beams with a single OAM mode of+1,+2,and+3 generated by the metasurface is as high as over 0.93.The generated multiplexed vortex beams carrying(+1,+2,+3)OAM modes with a power ratio of 1:1:1,(+1,+2,+3)modes with a power ratio of 1:2:3,and(-2,-1,+1,+2)modes with a power ratio of 1:2:2:1 are further verified effectively.The proposed space-time-coding metasurface has great potential for OAM multiplexing communication systems.

关 键 词：SURFACE MODE DYNAMIC 

分 类 号：O43[机械工程—光学工程]