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拉盖尔高斯光束矢量远场单球粒子的散射特性

Scattering Properties of Vectorial Far-Field Laguerre-Gaussian Beam by Single Spherical Particle

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摘要

运用空间矢量角谱法,分析了低阶拉盖尔高斯光束(LGB)在空间中的非傍轴矢量传输特性,得到了LGB远场矢量分布的解析式。基于广义Mie散射理论,分析了单个均匀球形粒子对LGB的散射特性。研究结果表明,随着LGB拓扑荷数的增大,光斑中空的面积增大,位于光轴上的微分散射截面减小;随着粒子尺度参数的增大,消光效率因子、散射效率因子和吸收效率因子出现峰值,并且峰值随着拓扑荷数的增大向着粒子尺度增大的方向移动。

Abstract

The non-paraxial vector propagation characteristics of low order Laguerre-Gaussian beam (LGB) in space are analyzed by the space vector angular spectrum method, and the analytic expression of vectorial far-field distribution of LGB is obtained. Based on the generalized Lorenz-Mie theory, the scattering property of LGB by a single homogeneous spherical particle is analyzed. The research results show that, with the increase of topological charge of LGB, its hollow spot area increases while its on-axis differential scattering cross section decreases. With the increase of particle size, there exist peaks for the absorption, scattering and extinction efficiency factors, meanwhile these peaks shift towards the increase direction of particle size when the topological charge increases.

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中图分类号:O436.2

DOI:10.3788/cjl201845.0605003

所属栏目:光束传输与控制

基金项目:国家自然科学基金(61571355)

收稿日期:2017-09-30

修改稿日期:2017-12-21

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作者单位    点击查看

徐强:西安电子科技大学物理与光电工程学院, 陕西 西安 710071
李金刚:西安电子科技大学物理与光电工程学院, 陕西 西安 710071
王旭:西安电子科技大学物理与光电工程学院, 陕西 西安 710071
韩一平:西安电子科技大学物理与光电工程学院, 陕西 西安 710071
吴振森:西安电子科技大学物理与光电工程学院, 陕西 西安 710071

联系人作者:徐强(qxu@xidian.edu.cn)

备注:徐强(1973—),男,博士,副教授,主要从事激光传输、散射方面的研究。E-mail: qxu@xidian.edu.cn

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引用该论文

Xu Qiang,Li Jingang,Wang Xu,Han Yiping,Wu Zhensen. Scattering Properties of Vectorial Far-Field Laguerre-Gaussian Beam by Single Spherical Particle[J]. Chinese Journal of Lasers, 2018, 45(6): 0605003

徐强,李金刚,王旭,韩一平,吴振森. 拉盖尔高斯光束矢量远场单球粒子的散射特性[J]. 中国激光, 2018, 45(6): 0605003

被引情况

【1】徐华锋,崔巍,张洲. 基于4π聚焦系统提高光学捕获稳定性. 激光与光电子学进展, 2018, 55(10): 102601--1

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