聚焦余弦平方高斯光束的梯度力  

The gradient force pattern of focused cosine-squared Gaussian beams

作　　者：郝中骐[1] 刘莉[1] 

机构地区：[1]宜春学院物理科学与工程技术学院,宜春336000

出　　处：《激光杂志》2012年第3期21-22,共2页Laser Journal

摘　　要：利用Collins公式推导了余弦平方高斯光束(CSGB)通过无光阑透镜光学系统聚焦后的光强分布及梯度力表达式。通过数值模拟讨论了光束参数、光束入射距离及系统菲涅耳数的变化对梯度力分布及光阱的数量、位置及尺度的影响。结果表明,光束相关参数越大光阱的数量越多,光阱的位置随光束入射距离而改变,系统菲涅耳数增加光阱尺度减小,而位置不变。The intensity distribution and gradient force pattern of cosine- squared Ganssian beams focused by a thin lens without aperture were derived based on the Collins formula. Through the numerical simulation, the influence of the beams parameter, relative incident separation and beams Fresnel number on the distribution of gradient force pattern and the numbers, position and size of optical traps were discussed. The results indicated that the bigger of the beams parameter the more of the optical traps, the positions of which change with beams relative incident separation,and the size decreased with the increase of Fresnel number of the system while the position is unchanged.

关 键 词：余弦平方高斯光束 无光阑透镜 梯度力 光阱 

分 类 号：Q631[生物学—生物物理学]