基于液晶器件的同轴复合涡旋光束的产生及调控  

Generation and regulation of coaxial composite vortex beams based on liquid crystal devices

作　　者：孙巍 周昕怡 樊帆 谢向生 周雅琴 SUN Wei;ZHOU Xin-yi;FAN Fan;XIE Xiang-sheng;ZHOU Ya-qin(College of Science,Shantou University,Shantou 515063,China;School of Physics and Electronics,Hunan University,Changsha 410082,China)

机构地区：[1]汕头大学理学院,广东汕头515063 [2]湖南大学物理与微电子科学学院,湖南长沙410082

出　　处：《液晶与显示》2023年第12期1664-1671,共8页Chinese Journal of Liquid Crystals and Displays

基　　金：汕头大学科研启动经费项目(No.NTF21051);广东省基础与应用基础研究基金(No.2021A1515012050)。

摘　　要：传统的多涡旋光束多为离轴光束,需要更精密的镜头、光路复杂且成像质量差,限制了其应用。本文设计并制备了一种基于液晶器件的复合q-plate,其透射效率大于95%,同时可生成同轴复合涡旋光束。通过理论和实验证明了该器件生成的复合涡旋光束的传播特性,该光束具有自旋和长距离衍射后自愈等新颖的衍射现象,生成的同轴复合涡旋光束避免了传统多涡旋光束离轴的缺点。此研究为粒子捕获和操控、光信息处理、光学加密和光学测量等领域的应用提供了全新的手段。Traditional multi-vortex beams are mostly off-axis,which limit their applications due to the need for more precise lenses,complex optical paths,and poor imaging quality.In this paper,a mixed q-plate based on liquid crystal devices is designed and fabricated.The transmittance of q-plate is greater than 95%and the coaxial composite vortex beam can be generated.The propagation characteristics of the composite vortex beams generated by this device are theoretically and experimentally demonstrated.The beam exhibits novel diffraction phenomena such as spin and long-distance self-healing after diffraction.The generation of coaxial composite vortex beams avoids the disadvantages of off-axis traditional multi-vortex beams.This research provides a new method for particle capture and manipulation,optical information processing,optical encryption and optical measurement.

关 键 词：液晶结构化光取向器件 同轴复合涡旋光束 

分 类 号：O436[机械工程—光学工程]