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Effective multiple optical trapping of sub-micrometer particles with petal beams
Journal of the Optical Society of America B ( IF 1.9 ) Pub Date : 2020-11-06 , DOI: 10.1364/josab.402944
V. Shahabadi , E. Madadi

Optical tweezers are noncontact and noninvasive force transducers. Techniques for multiple optical trapping are of much interest. In this paper, we investigate, numerically, optical trapping of multiple particles using so-called petal beams by trapping every single particle in a separate petal of the focused beam. We have used the generalized Lorenz–Mie theory to compute the optical trapping forces. Results demonstrate that the intensity is equally distributed over the lobes along the intensity ring for circularly polarized petal beams, but in the case of linear polarization, the intensity is not equally distributed over the petals, which means a particle trapped by every petal of a circularly polarized beam experiences the same force. It is shown that for a particle size range, the axial trapping stiffness for the $l = 4$ mode of a petal beam is about threefold greater than that of the $l = 1$ mode, and in the lateral direction, the trapping stiffness of the $l = 2$ mode is about twofold greater than that of the $l = 4$ mode. Finally, the optimum choice of topological charge for the stronger trap stiffness based on the particle size and trapping depth is identified.

中文翻译:

使用花瓣束有效地多次捕获亚微米颗粒

光学镊子是非接触式和非侵入式力传感器。多次光学陷印技术备受关注。在本文中,我们通过将每个单个粒子捕获在聚焦束的单独花瓣中的方法,通过数值研究使用所谓的花瓣束对多个颗粒进行光学捕获。我们已经使用了广义的Lorenz-Mie理论来计算光学俘获力。结果表明,对于圆偏振花瓣束,强度沿着强度环在瓣上均匀分布,但是在线性偏振的情况下,强度在花瓣上不均匀分布,这意味着每个圆瓣的每个陷阱都捕获了一个粒子偏振光束受到相同的力。结果表明,对于粒径范围,$ l的轴向俘获刚度= 4 $花瓣光束的模式是约三倍大于所述的$升= 1种$模式,并且在横向方向上,所述的捕获刚度$ L = 2 $模式是大约两倍大于所述的$ L = 4 $模式。最后,确定了基于颗粒大小和捕集深度的,对于较强的捕集刚度而言最佳的拓扑电荷选择。
更新日期:2020-12-02
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