局域空心光束的光场缺陷调控及粒子捕获研究  

Optical Field Defect Regulation and Particle Capture of Localized Hollow Beam

作　　者：付文升 张希纯 朱尚典 吕金光[2] 马晓辉 张贺 Fu Wensheng;Zhang Xichun;Zhu Shangdian;Lü Jinguang;Ma Xiaohui;Zhang He(National Key Laboratory of High Power Semiconductor Lasers,Changchun University of Technology,Changchun 130022,Jilin,China;National Key Laboratory of Applied Optics,Changchun Institute of Optical and Precision Machinery and Physics,Chinese Academy of Sciences,Changchun 130033,Jilin,China)

机构地区：[1]长春理工大学高功率半导体激光国家重点实验室,吉林长春130022 [2]中国科学院长春光学精密机械与物理研究所应用光学国家重点实验室,吉林长春130033

出　　处：《中国激光》2022年第13期69-76,共8页Chinese Journal of Lasers

基　　金：应用光学国家重点实验室开放基金(SKLA02020001A17)。

摘　　要：设计了一种尺寸可调谐的局域空心光束,通过轴棱锥与透镜距离的调节改变局域空心光束的尺寸,通过矩形光阑的调节使局域空心光束产生缺口。用MATLAB模拟了局域空心光束在调控中的尺寸变化和开闭口变化,以及轴棱锥之后的贝塞尔光束的变化,通过模拟和实验分别展示了局域空心光束由形成到闭合的过程。用MATLAB模拟了金粒子在局域空心光束中受到的梯度力、散射力以及二者的合力,然后根据横向梯度力与纵向梯度力判断粒子通过缺口进入光场后的首次捕获情况,并根据分析计算出了能够囚禁住的金粒子的尺寸。Objective Localized hollow beam optical tweezers techniques have been widely used in life and nanosciences as physical tools to generate microforces without direct contact and realize the precise manipulation of microparticles.The expanding application needs have created more requirements for the optical tweezers technology,necessitating new optical field regulation techniques for producing various tunable optical traps.In conventional axial cone-lens optical systems,closed localized hollow beams can be generated to capture particles.However,once the localized hollow beams form,it is difficult for the particles to pass through the light wall into the light trap.Furthermore,the size cannot be freely regulated after the conventional localized hollow beams are produced.Therefore,this paper proposes the production of a localized hollow beam that freely opens and closes,allowing the particles to enter through the gap and controlling the particle capture and escape using the change in the gap.This is important for capturing particles and more conducive to such an operation.Methods We added a rectangular appendix in a conventional axial cone-lens optical system.We found that by modulating the incident circular Gaussian beam using the axial-cone optical appendix,the localized hollow beam generated after the axion-lens optical system could regulate and had opening properties.We simulated the distribution properties of the local rectangular Gaussian beam by simulating the beam passing through the axis cone and the beam after focusing on the incident lens.Next,we analyzed the causes and influences of localized hollow beam defects and experimentally verified the localized hollow beam from generation to closure.The particles were first analyzed using the beam properties in both longitudinal and transverse directions in localized hollow beams.The longitudinal gradient and scattering forces were calculated in the beam propagation direction,and gravity was claculated in the transverse direction to analyze the particle process fr

关 键 词：光学设计 局域空心光束 尺寸调谐 光场缺陷 粒子囚禁 梯度力 散射力 

分 类 号：O436[机械工程—光学工程]