Multiwavelength high-order optical vortex detection and demultiplexing coding using a metasurface  

作　　者：Dahai Yang Jie Lin Chen Chen Chang Li Junbo Hao Baiying Lv Keya Zhou Yiqun Wang Peng Jin 

机构地区：[1]Ministry of Education,Key Laboratory of Micro-systems and Micro-structures Manufacturing(Harbin Institute of Technology),Harbin,China [2]Harbin Institute of Technology,School of Instrumentation Science and Engineering,Harbin,China [3]Harbin Institute of Technology,School of Physics,Harbin,China [4]Chinese Academy of Sciences,Suzhou Institute of Nano-Tech and Nano-Bionics,Suzhou,China

出　　处：《Advanced Photonics Nexus》2022年第1期53-60,共8页先进光子学通讯（英文）

基　　金：supported by the National Natural Science Foundation of China(Grant No.62175050);Key Laboratory of Micro-systems and Micro-structures Manufacturing(Harbin Institute of Technology),Ministry of Education(Grant No.2019KM007)。

摘　　要：.Orbital angular momentum(OAM)of an optical vortex has attracted great interest from the scientific community due to its significant values in high-capacity optical communications such as mode or wavelength division multiplexer/demultiplexer.Although several configurations have been developed to demultiplex an optical vortex,the multiwavelength high-order optical vortex(HOOV)demultiplexer remains elusive due to lack of effective control technologies.In this study,we present the design,fabrication,and test of metasurface optical elements for multiwavelength HOOV demultiplexing based on optical gyrator transformation transformations in the visible light range.Its realization in a metasurface form enables the combined measurement of OAM,the radial index p,and wavelength using a single optical component.Each wavelength channel HOOV can be independently converted to a high-order Hermitian–Gaussian beam mode,and each of the OAM beams is demultiplexed at the converter output.Furthermore,we extend the scheme to realize encoding of the three-digit gray code by controlling the wavelength or polarization state.Experimental results obtained at three wavelengths in the visible band exhibit good agreement with the numerical modeling.With the merits of ultracompact device size,simple optical configuration,and HOOV recognition ability,our approach may provide great potential applications in photonic integrated devices and systems for high-capacity and demultiplex-channel OAM communication.

关 键 词：metasurface vortex beams orbital angular momentum optical gyrator transform phase modulation 

分 类 号：TN9[电子电信—信息与通信工程]