利用双锥角光纤探针捕获多微粒串列  

Trapping of multiparticle chain using double-tapered optical fiber tweezers

作　　者：吴雨庭 张波[1] 刘子龙[1] 陈聪 王婉玲 曾祥 WU Yuting;ZHANG Bo;LIU Zilong;CHEN Cong;WANG Wanling;ZENG Xiang(Department of Physics,School of Science,Wuhan University of Technology,Wuhan 430070,China)

机构地区：[1]武汉理工大学理学院物理系,武汉430070

出　　处：《激光技术》2023年第3期335-339,共5页Laser Technology

基　　金：国家自然科学基金资助项目(62061136002)。

摘　　要：为了捕获不同材料、不同尺寸的多微粒串列,采用界面层腐蚀法制备了双锥角光纤探针,搭建单光纤光镊系统捕获了酵母菌、二氧化硅和聚苯乙烯等材料的多微粒串列。结果表明,对于相同材料的微粒,双锥角探针所能捕获的微粒数量随其尺寸增加而减少,而对于相同尺寸的微粒,捕获微粒的数量随材料折射率增加而减少;通过测量捕获微粒串列时各个微粒的捕获力,发现串列中离探针尖端越远的微粒其所受捕获力越小,在外力的作用下远端的微粒将率先逃逸;理论计算显示当光纤探针的2次锥角超过60°时,不能捕获2个或2个以上的球形微粒,该结果和实验观测一致。此研究可应用于精细加工和微纳制造。In order to trapping multiparticle chain of different materials and different sizes,a double-tapered optical fiber tweezer(DOFT)was prepared by the interfacial layer etching method.A single-fiber optical tweezers system was built to trapping multiparticle chain of yeast,silica,polystyrene,and other materials.The experimental results show that for the particles of the same material,the number of particles trapped by the DOFT decreases with the increase of their size;as for the particles of the same size,the number of particles trapped by the DOFT decreases with the increase of their refractive index.By measuring the trapping force of the multiparticle chain,it is found that the farther from the probe,the smaller the trapping force.Therefore,the particles at the end of a probe will escape first under the external force.In addition,the results of theoretical calculations show that DOFT with second taper angle greater than 60°cannot trap two or more spherical particles,which is consistent with experimental observations.This study can be applied to precision machining and micro-nano fabrication.

关 键 词：激光技术 光纤光镊 界面层腐蚀法 多微粒捕获 光捕获 

分 类 号：TN249[电子电信—物理电子学]