涡旋相位编码的径向矢量光束的紧聚焦特性

发布时间：2018-02-20 07:31

本文关键词： 激光技术紧聚焦光学微操作径向矢量光　出处：《激光技术》2017年02期 　论文类型：期刊论文

【摘要】：为了研究涡旋相位编码的径向矢量高斯光束经过高数值孔径物镜之后的聚焦特性,采用RICHARDS和WOLF提出的矢量积分理论和数值模拟方法,对聚焦场的特征进行了理论分析和模拟实验验证,取得聚焦场分布随涡旋相位物理参量之间的数据关系。结果表明,当单个涡旋相位编码于径向矢量高斯光束时,在聚焦场能够获得2维的径向和纵向分量;当双涡旋相位对称地编码于径向高斯矢量光束时,聚焦场会出现两个光学暗点,此光学暗点处的折射率低于周围环境的折射率。这一结果对提高光学微操控的灵活性,以及对双微粒的捕获与操控是有帮助的。
[Abstract]:In order to study the focusing characteristics of vortex phase coded radial vector Gao Si beam after passing through a high numerical aperture objective lens, the vector integral theory and numerical simulation method proposed by RICHARDS and WOLF are adopted. The characteristics of the focusing field are theoretically analyzed and verified by simulation experiments. The data relationship between the distribution of the focusing field and the physical parameters of the vortex phase is obtained. The results show that when the single vortex phase is encoded in the radial vector Gao Si beam, Two dimensional radial and longitudinal components can be obtained in the focusing field, and two optical dark spots will appear when the phase of the double vortex encodes symmetrically in the radial Gao Si vector beam. The refractive index of this optical dark spot is lower than that of the surrounding environment. This result is helpful to improve the flexibility of optical micromanipulation and to capture and manipulate double particles.
【作者单位】：中国石油大学(华东)理学院;南开大学现代光学研究所光电信息科学与技术教育部重点实验室;
【分类号】：TN29

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