Efficient generation of polarization multiplexed OAM using levitated metasurfaces  

作　　者：Sihan Cui Xiaojun Huang Cuizhen Sun Helin Yang Xiaoyan Li 

机构地区：[1]College of Communication and Information Engineering,Xi’an University of Science and Technology,Xi’an 710054,China [2]Engineering Research Center of Smart Coal Mine Advanced Communication Technology,Universities of Shaanxi Province,Xi’an 710054,China [3]College of Physical Science and Technology,Central China Normal University,Wuhan 430079,China [4]College of Physical Science and Technology,Northwestern Polytechnical University,Xi’an 710129,China

出　　处：《Frontiers of physics》2025年第1期253-261,共9页物理学前沿(英文版)

基　　金：supported by the Key Research and Development Program of Shaanxi Province(No.2022GDTSLD-64).

摘　　要：Dual-polarization(DP)vortex waves(VWs)are widely applied in optical,electromagnetic,and quantum science owing to their ability to simultaneously convey two distinct and non-interfering orbital angular momentums(OAMs).Here,we propose a lightweight levitated meta-atom to achieve 360°phase control with a difference of no more than 1°while maximizing the reflection efficiency.In combination with convergent phase modulation,a OAM metasurface array that facilitates the generation of DP VWs with high mode purity and low divergence angles was designed.The measured DP VW bearing mode l=1 had only 4°divergence angle and 84%mode purity at 5.8 GHz.Furthermore,DP VWs with integer,fractional(l=1.5)and higher order(l=8)modes are discussed based on an OAM purity spectrum analysis.The experimental results were consistent with the simulation results,demonstrating the practicality of the proposed DP OAM metasurface and its potential applications in the field of multithreaded communication systems.

关 键 词：DUAL-POLARIZATION orbital angular momentum low divergence angles high mode purity 

分 类 号：TN9[电子电信—信息与通信工程]