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。
Orbital angular momentum(OAM)beam with helical phase distribution has demonstrated important applications 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,duplicate,and integrate can efficiently prop up the generation of high-quality large-area array-type OAM beams.
作者
聂芳松
姜美玲
张明偲
曹耀宇
李向平
Nie Fangsong;Jiang Meiling;Zhang Mingsi;Cao Yaoyu;Li Xiangping(Guangdong Provincial Key Laboratory of Optical Fiber Sensing and Communications,Institute of Photonics Technology,Jinan University,Guangzhou,Guangdong 510632,China)
出处
《光电工程》
CAS
CSCD
北大核心
2020年第6期83-90,共8页
Opto-Electronic Engineering
基金
国家自然科学基金资助项目(61605061,61875073)
广东省自然科学基金资助项目(2016A030313088)
广东省创新创业资助项目(2016ZT06D081)。
