拉盖尔-高斯光束捕获双层球的捕获力计算

基于T矩阵法，计算拉盖尔-高斯光束(LGpl光束)光镊捕获双层球的捕获力。结果表明：随着数值孔径增大，光镊轴向和横向捕获效率最大值和捕获域均增加，数值孔径太小或太大时，光镊轴向和横向捕获效率会减小；球核折射率大于包层折射率时，随包层折射率增加，光镊轴向和横向捕获效率不断增大，球核折射率小于包层折射率时，光镊轴向和横向捕获效率会随包层折射率增加而减小；随LGpl光束的角向节线数(l)增大光镊轴向捕获效率最大值先增加后减小，而随LGpl光束的径向节线数(p)增加轴向捕获效率最大值渐渐减小，曲线逐渐平行于横坐标轴。

Abstract

Trapping forces of core-shell particles trapped by Laguerre-Gaussian beams (LGpl beams) are calculated using T-matrix method. The results show that both the maximum of axial and radial trapping efficiencies and trapping regions of optical tweezers increase with the numerical apertures of objective, while the axial and radial trapping efficiencies reduce with too big or too small numerical apertures of objective. The axial and radial trapping efficiencies of optical tweezers increase with the refractive indices of particles cladding, when the refractive indices of particles core are greater than the refractive indices of particles cladding. The axial and radial trapping efficiencies of optical tweezers decrease with the refractive indices of particles cladding, when the refractive indices of particles core are less than the refractive indices of particles cladding. The axial trapping efficiencies increase firstly and then decrease with the azimuthal model index (l) of the LGpl beams. The maximum of axial trapping efficiencies decrease and the curve is parallel to x-axis gradually with the increase of the radial model index (p) of the LGpl beams.

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王娟, 任洪亮. 拉盖尔-高斯光束捕获双层球的捕获力计算[J]. 中国激光, 2015, 42(6): 0608001. Wang Juan, Ren Hongliang. Trapping Forces of Core-Shell Particles Using Laguerre-Gaussian Beams[J]. Chinese Journal of Lasers, 2015, 42(6): 0608001.

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