Abstract

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.

© 2020 Optical Society of America

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