对置双透镜聚焦系统中纽结焦场的研究

项目名称： 对置双透镜聚焦系统中纽结焦场的研究

项目编号： No.61205123

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 信息四处

项目作者： 严绍辉

作者单位： 中国科学院西安光学精密机械研究所

项目金额： 28万元

中文摘要： 某些入射光场的聚焦场具有特殊的强度、偏振和相位分布，在与物质相互作用时，可以展示一些奇特的性质。如涡旋光束在聚焦后可以形成环形聚焦，在和被捕获的微粒作用时可以将光学轨道角动量传递给微粒，从而驱使微粒做轨道运动。本项目将从理论和实验上研究如何利用对置双透镜聚焦系统（也称4PI聚焦系统）实现一类奇特的纽结焦场。这种纽结的焦场的能量（强度）集中于一个三维纽结形状的管道中，而场的能流沿着管道的中轴线流动。这种纽结焦场对微粒具有独特的光学捕获作用：微粒被束缚在三维纽结管道中的同时，在能流作用下沿着管道轴线运动。通过对于这种纽结焦场的研究，提高对一些特殊光场的认识，为探索微观领域提供一种新的光学操控方法。

中文关键词： 4PI 聚焦系统；光学捕获；纽结状焦场；；

英文摘要： Focused fields of some incident fields have special distribution of intensity, polarization and phase,enabling some unique behaviors in interaction with matters.A vortex laser beam, for example, can be focused into an annular distribution of intensity,and transfers its optical orbital angular momentum to the trapped particle to drive the particle's orbital motion.This research investigates theoretically and experimentally how to create an extremely special knotted focal field using an opposite double-lens focusing system (also called 4PI focusing system).This focal field has its engergy limited to a three dimensional knot-like tube and makes its energy flow circulating along the central axis of the tube.This knotted focal field can form a special optical trapping potential well, in which micro particles are constrained into the three dimensional knot-like tube and driven by the energy flow to move along the central axis of the tube. By the study of this knotted focal field, it is hoped to better our understanding of special optical fields and provide a new method of optical trapping for exploring microcosm.

英文关键词： 4PI focusing system；Optical Trapping；Knotted focusing fields；；