光学学报, 2020, 40 (12): 1226001, 网络出版: 2020-06-03   

基于4pi聚焦系统实现特殊焦场结构之间的转换 下载: 1002次

Conversion Between Special Focal Field Structures Based on 4pi Focusing System
作者单位
上海大学理学院物理系, 上海 200444
摘要
基于Richards-Wolf矢量衍射积分理论,利用角向偏振涡旋光束经高数值孔径透镜强聚焦后有径向分量的结论,研究了经衍射光学元件调制的角向偏振拉盖尔高斯光束的4pi聚焦特性。模拟结果显示,通过选取合适的拦截比、数值孔径及衍射光学元件的外环结构三个参量,可以在焦平面上得到平顶光场。在此基础上,通过改变三个参量中的任意一个参量,平顶光场结构均会向光针结构转变;通过改变三个参量中的任意两个参量,会获得很好的暗通道结构,并且获得的暗通道结构基本相同。这些特殊焦场结构之间的转换在光学微操控领域具有潜在的应用价值。
Abstract
Based on the Richards-Wolf vector diffraction integral theory and the conclusion that an angularly polarized vortex beam has a radial component after strong focusing with a high numerical aperture, the 4pi focusing characteristics of an angularly polarized Laguerre-Gaussian beam modulated by a diffraction optical element (DOE) are studied. The simulation results show that the flat-top optical field can be obtained in the focal plane by selecting the appropriate intercept ratio, numerical aperture, and outer ring structure of DOE. On this basis, by changing any one of these three parameters, the structure of the flat-topped optical field will be transformed into an optical needle one. By changing any two of these three parameters, a good dark channel structure can be obtained, and all the dark channel structures obtained are basically same. The conversion among these special focal field structures has a potential application in the field of optical micro-manipulation.

李红艳, 杨艳芳, 何英, 段慧慧, 阎皙玉. 基于4pi聚焦系统实现特殊焦场结构之间的转换[J]. 光学学报, 2020, 40(12): 1226001. Hongyan Li, Yanfang Yang, Ying He, Huihui Duan, Xiyu Yan. Conversion Between Special Focal Field Structures Based on 4pi Focusing System[J]. Acta Optica Sinica, 2020, 40(12): 1226001.

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