利用多轴非对称结构光束的微球光学操控  

Optical Manipulation of Micro-Particles with Multi-Axis Asymmetric Structured Beam

作　　者：陈君[1] 黄曾鑫 匡登峰 Chen Jun;Huang Zengxin;Kuang Dengfeng(School of Physics and Electronic Engineering,Taishan University,Taishan,Shandong 271021,China;Tianjin Key Laboratory of Micro-Scale Optical Information Science and Technology,Institute of Modern Optics,Nankai University,Tianjin 300350,China)

机构地区：[1]泰山学院物理与电子工程学院,山东泰安271021 [2]南开大学现代光学研究所天津微尺度光信息科学技术重点实验室,天津300350

出　　处：《中国激光》2021年第24期184-192,共9页Chinese Journal of Lasers

基　　金：天津市自然科学基金(18JCZDJC38200);南开大学-泰山学院合作项目(F1033851)。

摘　　要：设计了一种用于产生多轴非对称结构光束的新型多轴非对称指数型锥器件,器件由非对称结构和多轴结构复合而成。利用理论计算、数值模拟和实验测量方法,验证了多轴非对称结构光束在传播过程中会产生多个焦点并且具有独特的能流特性。利用这一特性设计并开展了利用聚焦多轴非对称结构光束操控聚苯乙烯荧光微球的实验,结果表明,多轴非对称结构光束使得聚苯乙烯微球在被捕获过程中表现出“加速-减速-再加速”的运动规律,与模拟计算结果一致。多轴非对称指数型锥器件及其产生的多轴非对称结构光束在药物传输、微粒筛选等领域中有着重要的应用价值。Objective Recently,optical tweezers and related optical manipulation technologies have been extensively studied.One important method to improve the capability of optical manipulation is to use structured beams with novel propagation properties to realize specific capture and manipulation of particles.Here,we propose a new type of multi-axis asymmetric exponential cone device composed of an asymmetric structure and a multi-axis structure for generating multi-axis asymmetric structured beams.These beams are proved to be effective to give the dielectric microspheres a unique’accelerating-decelerating-reaccelerating’movement and provide new ideas and implementation methods for particle screening and transporting.Methods Themulti-axis asymmetric exponential cone is designed with the geometrical optics theory and the diffractive optics theory.The modulating effects of such a device are produced by the different height distribution functions of its two asymmetric parts,which causes the redirection of the wave vector and influences the phase difference during propagation.With the three-dimensional finite-difference time-domain simulations,the electromagnetic field distribution of the multi-axis asymmetric structured beam is obtained.Also,the energy flux distribution and the optical force distribution of dielectric microspheres are investigated based on the electro-magnetic field distributions of these beams.Moreover,the measurement of a focused multi-axis asymmetric structured beam and the manipulation of polystyrene fluorescent microspheres are conducted with our home-made experimental system to study the application potential in optical manipulation.The spatial light modulator and the phase mask of the device are employed to generate a multi-axis asymmetric structured beam in experiments.Results and Discussions From the simulation results,the multi-axis asymmetric structured beam shows an alternation of multiple focal points and a ring-shaped focal pattern during propagation,possessing unique energy flow characteri

关 键 词：微纳光学 微光学元件 相位调制 激光光束整形 光学捕获 光学操纵 

分 类 号：O436[机械工程—光学工程]