光电工程, 2020, 47 (6): 200093, 网络出版: 2020-10-27
基于迂回相位的轨道角动量Talbot阵列照明器
Orbital angular momentum Talbot array illuminator based on detour phase encoding
分数 Talbot效应 轨道角动量 周期性结构 迂回相位 fractional Talbot effect orbital angular momentum periodic structure detour phase
摘要
轨道角动量 (OAM)光束具有螺旋形相位分布, 在信息光学、光捕获、光学操控等领域都有着重要的应用。本文设计了一种可以生成聚焦 OAM光束的平面型光学器件。该器件利用迂回相位的编码方式, 在平板上加载了根据分数 Talbot效应计算得到的特定相位分布。使用时域有限差分 (FDTD)分别对具有正方形和六边形周期性结构的光学器件进行仿真模拟。结果表明, 平面波经过此器件可以转化为阵列型聚焦 OAM光束。该器件加工方便, 容易拼接或复制, 集成度高, 可以用来生成高质量大面积阵列型 OAM光束。
Abstract
Orbital angular momentum (OAM) beam with helical phase distribution has demonstrated important ap-plications in information optics, optical trapping, and optical manipulation. In this paper, we designed a planar optical device which can generate a periodic array of focused orbital angular momentum beams. Based on detour phase encoding, the phase distribution calculated by fractional Talbot effect is implemented on this planar optical device. The property of this optical device with periodic square and hexagonal structures is simulated by finite difference time domain (FDTD) respectively. The optical device with explicit advantages of being easy to fabricate, splice, dup-licate, and integrate can efficiently prop up the generation of high-quality large-area array-type OAM beams.
聂芳松, 姜美玲, 张明偲, 曹耀宇, 李向平. 基于迂回相位的轨道角动量Talbot阵列照明器[J]. 光电工程, 2020, 47(6): 200093. Nie Fangsong, Jiang Meiling, Zhang Mingsi, Cao Yaoyu, Li Xiangping. Orbital angular momentum Talbot array illuminator based on detour phase encoding[J]. Opto-Electronic Engineering, 2020, 47(6): 200093.