部分相干柱偏振矢量光束的紧聚焦特性及其应用研究

项目名称： 部分相干柱偏振矢量光束的紧聚焦特性及其应用研究

项目编号： No.11304204

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 数理科学和化学

项目作者： 董一鸣

作者单位： 绍兴文理学院

项目金额： 28万元

中文摘要： 柱偏振矢量(CV)光束由于其独特的紧聚焦特性以及极具潜力的应用前景正受到人们的极大关注。在实际应用中，为了得到特殊的聚焦光斑（如瓶状光斑），通常需要对入射的CV光束进行振幅和位相的调控。本项目拟引入相干性调控，研究在三种调控的综合作用下，对CV光束的紧聚焦光场进行调控优化，得到更特殊、更具有应用价值的聚焦光斑，并探讨其在光学俘获中的应用。主要研究：(1)不同关联的空间部分相干CV光束经过高数值孔径透镜的紧聚焦特性，通过改变CV光束的空间相干性实现对聚焦场的优化设计；(2)时间部分相干CV脉冲光束的紧聚焦特性，并对聚焦光场实现整形调控；(3)高聚焦后的空间与时间部分相干CV光束对微粒的辐射力，通过调控光束的空间与时间相干性、振幅、位相、光斑大小等参数来提高辐射力和增大俘获区域。本项目将丰富部分相干CV光束的紧聚焦理论，为部分相干CV光束在光镊中的应用提供理论依据。

中文关键词： 部分相干；柱偏振矢量光束；紧聚焦；高数值孔径透镜；

英文摘要： Cylindrical vector (CV) beam has attracted more and more attention due to its unique tightly focusing properties and great potential applications. In numerous practical applications, to achieve special focal spots (such as focal bottle beam), it needs to make amplitude or phase modulation to the incident CV beam. In this project,we will modulate the coherence of the incident CV beam, as well as the amplitude and phase, to improve the intensity distribution in the focal region, and obtain more special and valuable focal spots. Furthermore, we will investigate its application in optical trapping field. We will focus on the aspects of content as follows. (1) We will investigate the tightly focusing properties of spatial partially coherent CV beam with different kinds of correlation functions passing through a high numerical aperture lens. The focusing field distribution will be improved by modulating the spatial coherence of the incident CV beam. (2) We will study the tightly focusing properties of the temporal partially coherent CV beam pulse beam, and achieve focusing shaping in the focal region. (3) We will investigate the radiation force of a tightly focused spatial or temporal partially coherent CV beam acting on a Rayleigh particle. The radiation force and trapping range will be increased by modifing the para

英文关键词： partially coherent；cylindrical vector beam；tightly focusing；high numerical aperture lens；