Effective sorting of fractional optical vortex modes  

作　　者：Zhengyang Mao Haigang Liu Xianfeng Chen 

机构地区：[1]Shanghai Jiao Tong University,School of Physics and Astronomy,State Key Laboratory of Advanced Optical Communication Systems and Networks,Shanghai,China [2]Shanghai Research Center for Quantum Sciences,Shanghai,China

出　　处：《Advanced Photonics Nexus》2024年第6期1-8,共8页先进光子学通讯(英文)

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.12192252 and 12374314);the National Key Research and Development Program of China(Grant No.2023YFA1407200).

摘　　要：The mode sorter is the crucial component of the communication systems based on orbital angular momentum(OAM).However,schemes proposed so far can only effectively sort integer OAM(IOAM)modes.Here,we demonstrate the effective sorting of fractional OAM(FOAM)modes by utilizing the coordinate transformation method,which can convert FOAM modes to IOAM modes.The transformed IOAM modes are subsequently sorted using a mode conversion method called topological charge matching.The validation of our scheme is verified by implementing two FOAM sorting processes and corresponding mode purity analyses,both theoretically and experimentally.This new sorting method exhibits great potential for implementing a highly confidential and high-capacity FOAM-based communication and data storage system,which may inspire further applications in both classical and quantum regimes.

关 键 词：vortex mode sorter fractional vortex beam angular momentum coordinate transformation 

分 类 号：TN9[电子电信—信息与通信工程]