光学学报, 2011, 31 (s1): s100405, 网络出版: 2011-06-23   

艾里光束对微小颗粒的捕获和输运研究 下载: 553次

Study on Optical Trapping and Propulsion of Small Particles by Airy Beam
作者单位
南开大学物理科学学院, 天津 300071
摘要
采用瑞利近似方法,数值模拟了纳米尺度的电介质粒子在一维艾里(Airy)光束作用下的光学散射力、梯度力,分析了小球所受的光学散射力和梯度力与小球半径、折射率的关系。同时,还数值模拟了小球在艾里光束中的运动轨迹,讨论了小球半径、折射率以及环境粘滞系数对小球轨迹的影响。结果表明光学散射力和梯度力随着小球半径和折射率的增大而增大。小球在光学梯度力的作用下,被牵引到光强极大值处,沿着抛物线做振荡运动,并最终收敛于抛物线型结构。小球的半径、折射率越小,以及环境的粘滞系数越大,小球轨迹的振荡越弱,收敛速度越快。
Abstract
The gradient and scattering force of Rayleigh dielectric particles induced by one-dimensional Airy beam were numerically investigated. The impact of particle radius and refractive index on the gradient and scattering forces were discussed. Trajectories of particles in the Airy beam were investigated and their relationships with particle radius, refractive index, and viscosity of surrounding medium were studied. Results validated that larger size and larger refractive index of particles resulted in larger gradient and scattering force. Particles in the Airy beam were firstly dragged into the nearest optical intensity peaks, and then oscillated along the parabolic trajectories and finally converged to the parabolic line. Smaller particles and larger viscosity of surrounding medium resulted in less oscillation and faster convergence to the parabolic line.
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程化, 臧维平, 田建国. 艾里光束对微小颗粒的捕获和输运研究[J]. 光学学报, 2011, 31(s1): s100405. Cheng Hua, Zang Weiping, Tian Jianguo. Study on Optical Trapping and Propulsion of Small Particles by Airy Beam[J]. Acta Optica Sinica, 2011, 31(s1): s100405.

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