基于贝塞尔-高斯光束的布朗粒子的扩散特性  

Diffusion properties of Brownian particles based on a Bessel-Gaussian beam

作　　者：刘冬梅[1,2,3] 王彤旭 陈亚 温演柔 文瀚泽 韩鹏 LIU Dongmei;WANG Tongxu;CHEN Ya;WEN Yanrou;WEN Hanze;HAN Peng(School of Physics and Telecommunication Engineering,South China Normal University,Guangzhou 510006,China;Guangdong Provincial Engineering Research Center for Optoelectronic Instrument,South China Normal University,Guangzhou 510006,China;SCNU Qingyuan Institute of Science and Technology Innovation,Qingyuan 511517,China)

机构地区：[1]华南师范大学物理与电信工程学院,广东广州510006 [2]华南师范大学广东省光电检测仪器工程技术研究中心,广东广州510006 [3]华南师大(清远)科技创新研究院,广东清远511517

出　　处：《中国粉体技术》2022年第4期36-42,共7页China Powder Science and Technology

基　　金：国家自然科学基金项目,编号:61975058;广东省自然科学基金项目,编号:2019A1515011401。

摘　　要：利用环形相位光学衍射结构产生贝塞尔-高斯光束,将其投影到作布朗运动的聚苯乙烯小球溶液中;基于共轴差分动态显微技术,测量粒径为813 nm的聚苯乙烯小球在不同光功率下的扩散系数,研究贝塞尔-高斯光束对小球扩散运动的影响,并与高斯光束作用下的小球扩散系数相比较。结果表明:不论是在高斯光束还是在贝塞尔-高斯光束作用下,作受限布朗运动的聚苯乙烯小球的扩散系数均小于无激光作用时的;在相同激光功率照射下,贝塞尔-高斯光束作用下小球的扩散系数均大于高斯光束作用时的;随着激光功率的增加,2种光束照射下的小球扩散系数均出现先减小后略有增加的现象。A Bessel-Gaussian beam was generated by a ring-shaped phase optical diffraction structure and projected into a solution of polystyrene spheres undergoing Brownian motion. Based on coaxial differential dynamic microscopy, the diffusion coefficients of polystyrene beads with a particle size of 813 nm under different optical powers were measured. The influence of the Bessel-Gaussian beam on the diffusion motion of the ball was studied and compared with that of the ball under the action of the Gaussian beam. The results show that the diffusion coefficients of the restricted Brownian motion of polystyrene spheres are smaller than those of without laser action, whether under the action of Gaussian beam or Bessel-Gaussian beam. Under the same laser power, the diffusion coefficients of the balls under the action of Bessel-Gaussian beams are all larger than those under the action of Gaussian beams. With the increase of laser power, the diffusion coefficients of the spheres under the irradiations of the two beams first decrease and then increase slightly.

关 键 词：扩散系数 贝塞尔-高斯光束 受限布朗运动 差分动态显微术 

分 类 号：O436.3[机械工程—光学工程]