光学学报, 2017, 37 (6): 0626002, 网络出版: 2017-06-08
相位差因子调控的Ince-Gaussian光束空间模式分布 下载: 507次
Spatial Mode Distributions of Ince-Gaussian Beams Modulated by Phase Difference Factor
物理光学 光学涡旋 因斯-高斯模式 自由调控技术 微粒操纵 physical optics optical vortex Ince-Gaussian modes free-control technique micro-particle manipulation
摘要
提出了一种基于奇偶模初始相位差因子调控的新型Ince-Gaussian(IG)光束, 即PIG(Ince-Gaussian beam with phase difference)光束。对传统IG光束偶模施加具有初始相位差φ的e指数相位因子, 将偶模与奇模进行线性叠加后得到了PIG光束。在其他参数相同的条件下, 重点研究了初始相位差调控因子对PIG光束空间模式的调控特性。数值模拟和实验结果表明: 当参数φ在0到π区间上连续取值时, 可实现正负涡旋PIG光束的连续变换; 当φ=π/2时, 中间状态涡旋消失; 调节φ使其为π的整数倍, 可以实现正负涡旋模式的跳变切换; 当调节φ为π的半整数倍时, 该光束可实现光瓣在椭圆轨迹上的精确位移控制。PIG光束为微粒操纵及光束微雕刻等领域提供了额外的调控自由度。
Abstract
A novel type of Ince-Gaussian (IG) beam, named as PIG (Ince-Gaussian beam with phase difference) beam, based on the initial phase difference factor modulation between even mode and odd mode of IG beam is proposed. The PIG beam is generated by the linear superposition of the even mode and the odd mode of traditional IG beam after the even mode being multiplied an exponential phase factor with an initial phase difference of φ. The modulation properties of the initial phase difference factor on spatial mode of the PIG beam are mainly studied when other parameters are the same. Numerical simulations and experimental results show that the PIG beam changes from positive vortex state to negative vortex state when φ continuously increases from 0 to π. The vortex state is vanished when φ=π/2. As φ is equal to integer multiple of π, the switch from the positive vortex state to the negative vortex state is realized. As φ is equal to half-integer multiple of π, light traps of the PIG beams can be accurately controlled to move on the oval orbit. The PIG beam will provides an additional degree of freedom for micro-particle operation and beam micro-machining.
马海祥, 李新忠, 李贺贺, 唐苗苗, 王静鸽, 汤洁, 王屹山, 聂兆刚. 相位差因子调控的Ince-Gaussian光束空间模式分布[J]. 光学学报, 2017, 37(6): 0626002. Ma Haixiang, Li Xinzhong, Li Hehe, Tang Miaomiao, Wang Jingge, Tang Jie, Wang Yishan, Nie Zhaogang. Spatial Mode Distributions of Ince-Gaussian Beams Modulated by Phase Difference Factor[J]. Acta Optica Sinica, 2017, 37(6): 0626002.