Optical trapping capability of tornado circular Pearcey beams

Abstract

We systemically investigate optical trapping capability of a kind of tornado waves on Rayleigh particles. Such tornado waves are named as tornado circular Pearcey beams (TCPBs) and produced by combining two circular Pearcey beams with different radii. Our theoretical exploration delves into various aspects, including the propagation dynamics, energy flux, orbital angular momentum, trapping force, and torque characteristics of TCPBs. The results reveal that the orbital angular momentum, trapping force, and torque of these beams can be finely tuned through the judicious manipulation of their topological charges (l 1 and l 2). Notably, we observe a precise control mechanism wherein the force diminishes with |l 1 + l 2| and |l 1–l 2|, while the torque exhibits enhancement by decreasing solely with |l 1 + l 2| or increasing with |l 1–l 2|. These results not only provide quantitative insights into the optical trapping performance of TCPBs but also serve as a valuable reference for the ongoing development of innovative photonic tools.