光场偏振态对布朗运动扩散系数的影响  

Polarization effect on diffusion coefficient of Brownian motion

作　　者：陈柏桦 刘冬梅[1,2] 邱健 彭力[1,2] 骆开庆 韩鹏[1,2] CHEN Baihua;LIU Dongmei;QIU Jian;PENG Li;LUO Kaiqing;HAN Peng(School of Physics and Telecommunication Engineering,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,广东省光电检测仪器工程技术研究中心,广东广州510006 [2]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》2021年第3期68-72,共5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面上项目,编号:2019A1515011401;广东省科技计划项目,编号:2019B090905005。

摘　　要：基于差分动态显微技术,实验研究偏振光对颗粒布朗运动扩散系数的影响。实验结果表明,在弱聚焦条件下,布朗粒子在激光照射下的扩散系数比仅在白光照射下的扩散系数要小;在相同激光功率时,圆偏振光照射下颗粒扩散系数比线偏振光时的要小;随着入射激光功率的增大,线偏振光照射下的扩散系数表现出振荡的现象,而圆偏振光入射时,布朗运动扩散系数随功率的增大而减小。Based on the differential dynamic microscopy technology,the experiment studies the effect of polarization on diffusion coefficient of Brownian particles in a weak focused laser.The results show that the diffusion coefficient of Brownian particles illuminating with the laser is smaller than that only with white light.Compared with the linearly polarized light,the diffusion coefficient is smaller than that under the circularly polarized light at the same input light power.The diffusion coefficient of Brownian motion fluctuates with the increase of input light power in the linearly polarized light,while the diffusion coefficient decreases with the increase of laser power under circularly polarized light.

关 键 词：扩散系数 布朗运动 偏振光 差分动态显微术 

分 类 号：O436.3[机械工程—光学工程]