光子学报, 2018, 47 (9): 0905002, 网络出版: 2018-09-15
轨道角动量分离系统中纯相位型扇出光栅的设计
Design for the Phase-only FAN-OUT Grating of Orbital Angular Momentum Separation System
摘要
基于坐标变换的轨道角动量光束分离技术, 提出一种基于迭代算法的纯相位型扇出光栅设计方法, 实现光束复制, 以提高输出光斑的分辨率.建立轨道角动量光束的高分辨率分离系统的数值仿真模型.数值结果表明, 加入该方法设计得到的纯相位型扇出光栅后, 系统接收到的光斑能量更加集中, 轨道角动量螺旋谱的弥散程度至少下降了0.35, 错误概率下降了15%以上, 有利于系统实现高分辨率的轨道角动量光束分离.
Abstract
Based on the coordinate-transformation Orbital Angular Momentum (OAM) sorting scheme, this paper designs a phase-only FAN-OUT grating using a method based on iterative algorithm to copy beams and improve the resolution of the OAM beams sorting efficiently. This paper establishes a numerical simulation model for high-resolution sorting of OAM beams. Numerical results indicate that the energy in the spot received by the system with phase-only FAN-OUT grating is more concentrate and the minimum reduction of dispersion degree of the OAM spectrum is 0.35, the minimum reduction of the error probability is 15%. The phase-only FAN-OUT grating is advantageous for realizing high-resolution sorting of OAM beams.
尹霄丽, 廖焕宇, 王拥军, 常欢, 崔小舟, 林娇玲. 轨道角动量分离系统中纯相位型扇出光栅的设计[J]. 光子学报, 2018, 47(9): 0905002. YIN Xiao-li, LIAO Huan-yu, WANG Yong-jun, CHANG Huan, CUI Xiao-zhou, LIN Jiao-ling. Design for the Phase-only FAN-OUT Grating of Orbital Angular Momentum Separation System[J]. ACTA PHOTONICA SINICA, 2018, 47(9): 0905002.
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