Helicity-gradient force on chiral multipoles induced by optical vortex

Yiyu Shi; Zhiwei Cui

doi:10.1117/12.3035048

3 September 2024 Helicity-gradient force on chiral multipoles induced by optical vortex

Yiyu Shi, Zhiwei Cui

Proceedings Volume 13227, 2024 AI Photonics Technology Symposium; 1322704 (2024) https://doi.org/10.1117/12.3035048
Event: 2024 AI Photonics Technology Symposium, 2024, Wuhan, China

Abstract

The gradient in the helicity of optical field can exert the discriminatory force on the enantiomer, and this force is a concept well established within the dipole approximation for a Rayleigh particle. Here, with the aid of the multipole moment expansion theory, the formulae of the multipolar helicity-gradient force on a Mie chiral particle are derived. Moreover, such force induced by a tightly focused optical vortex is numerically simulated. The obtained results illustrate that the multipolar helicity-gradient force is not proportional to the gradient of optical helicity due to the nonlocal effect. The interception, recoil, electric, and magnetic components in such force are remarkably different. Besides, this force shows apparent dependence on the particles radius, beam topological charge and radio of the pupil radius to the beam waist radius. These findings can help us to understand the interplay of multipoles and may be exploited in chirality sensing, optomechanics, and manipulation.

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Yiyu Shi and Zhiwei Cui "Helicity-gradient force on chiral multipoles induced by optical vortex", Proc. SPIE 13227, 2024 AI Photonics Technology Symposium, 1322704 (3 September 2024); https://doi.org/10.1117/12.3035048

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