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arXiv · 2203.04175

Optical force and torque on small particles induced by polarization singularities

Jie Peng·Shiqi Jia·Chengzhi Zhang·Shubo Wang
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Abstract

Optical forces in the near fields have important applications in on-chip optical manipulations of small particles and molecules. Here, we report a study of optical force and torque on small particles induced by the optical polarization singularities of a gold cylinder. We show that the scattering of the cylinder generates both electric and magnetic C lines (i.e., lines of polarization singularities) in the near fields, and the C lines can induce complex force and torque on a dielectric/magnetic particle. The force and torque manifest dramatic spatial variations with interesting symmetry properties, providing rich degrees of freedom for near-field optical manipulations. The study, for the first time to our knowledge, uncovers the effect of optical polarization singularities on light-induced force and torque on small particles. The results contribute to the understanding of chiral light-matter interactions and can find applications in on-chip optical manipulations and optical sensing.

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Jie Peng, Shiqi Jia, Chengzhi Zhang, Shubo Wang. 2022-03-08. Optical force and torque on small particles induced by polarization singularities. https://doi.org/10.1364/oe.458060

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