Optical trapping two types of particles using a focused vortex beam
Optical trapping two types of particles using a focused vortex beam
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DOI：
10.1016/j.ijleo.2018.04.035
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发表时间：
2018-08
期刊：
影响因子：
3.1
通讯作者：
Hanghang Zhang;Jinhong Li;Guo Miaojun-;Meiling Duan;Zhifang Feng;Wen Yang
中科院分区：
文献类型：
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作者：
Hanghang Zhang;Jinhong Li;Guo Miaojun-;Meiling Duan;Zhifang Feng;Wen Yang
推导了高斯-谢尔模型涡旋光束通过聚焦光学系统的解析表达式。从理论上研究了GSM涡旋光束聚焦后对不同折射率的瑞利介质球的辐射力。数值结果表明，聚焦GSM无涡旋光束不能捕获低折射率粒子，但可以捕获高折射率粒子。聚焦后的GSM涡旋光束可以将高折射率粒子捕获到焦平面的亮环上，同时将低折射率粒子捕获到z轴上。拓扑荷越大，空间关联长度σ 0越大，两类粒子越容易被俘获。并对捕集稳定性进行了分析。
Propagations of Gaussian Schell-model (GSM) vortex beams through a focusing optical system are formulated. The radiation force acting on Rayleigh dielectric sphere with different refractive indices produced by focused GSM vortex beams is investigated theoretically. Numerical results demonstrate that the focused GSM non-vortex beam can not trap the low index of refraction particles, but can capture the high index of refraction particles. The focused GSM vortex beam can be used to trap high index of refraction particles to a bright ring of the focal plane, and simultaneously capture low index of refraction particles toz-axis. The larger the topological chargemis, the larger the value of the spatial correlation lengthσ0is, the easier it is to trap two types of particles is. Trapping stability is also analyzed.