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离轴参量及传输距离对离轴涡旋光束传输特性的影响

发表时间:2015-08-15  浏览量:1850  下载量:577
全部作者: 冯嘉文,朱正天,赵琦,陈元恺,刘一斯
作者单位: 南京理工大学电子工程与光电技术学院
摘 要: 利用标量菲涅尔衍射积分推导出离轴涡旋光束在拓扑荷为±1情况下经过单缝衍射后的电场解析表达式。通过Mathematica软件进行模拟,分析了离轴涡旋光束中心相位奇点的传输特性。模拟结果表明,离轴涡旋光束经单缝衍射后,传输距离、单缝宽度大小及初平面的离轴参量大小对中心奇点位置均会产生影响。然后,根据标量菲涅尔衍射积分理论及傅里叶变换公式,对非规范的椭圆涡旋光束进行研究,推导出离轴椭圆涡旋光束在不同拓扑荷的情况下自由空间传输的解析表达式,并通过Mathematica软件仿真详细研究了离轴椭圆涡旋光束的光强分布和相位奇点在自由空间的传输特性。仿真结果表明,离轴情况下,传输过程中光强分布会发生明显的变化,对于相位奇点的传输,相位奇点的位置随传输距离、离轴参量的改变而变化,在不同拓扑荷情况下变化各不相同。
关 键 词: 光学;涡旋光束;离轴;传输特性;相位奇点;光强分布
Title: Effect of off-axis parameter and propagation distance on the propagation properties of off-axis vortex beams
Author: FENG Jiawen, ZHU Zhengtian, ZHAO Qi, CHEN Yuankai, LIU Yisi
Organization: School of Electronic and Optical Engineering, Nanjing University of Science and Technology
Abstract: The analytical expression for the propagation of off-axis vortex beams with topological charge � through a single slit diffraction is derived based on the Fresnel diffraction integral, which is used to study the propagation of central phase singularity of off-axis vortex beams by using Mathematica software to numerical simulation. The simulation results show that after the off-axis vortex beam passing through a single slit diffraction, the spatial distribution of phase singularities depends on propagation distance, the half-width of a single slit and off-axis parameter. Then, we study the anisotropic elliptical vortex beams. The analytical expression for the propagation of off-axis elliptical vortex beams with different topological charges in free space is derived, which is used to study the intensity distribution and propagation of phase singularity of off-axis elliptical vortex beams in detail by using Mathematica software to numerical simulation. The results show that in the case of off-axis, the intensity distributions of beams will change significantly. And the position of phase singularity is always changed. The spatial distribution of phase singularities depends on propagation distance and off-axis parameter. There are some different changes for different topological charges.
Key words: optics; vortex beams; off-axis; properties of propagation; phase singularity; intensity distribution
发表期数: 2015年8月第15期
引用格式: 冯嘉文,朱正天,赵琦,等. 离轴参量及传输距离对离轴涡旋光束传输特性的影响[J]. 中国科技论文在线精品论文,2015,8(15):1581-1586.
 
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