Optical Forces Induced by a Pulsed LG0l modes on a Nano-Dielectric Spheres

Abstract

Theoretically, this study investigates the optical forces induced by a pulsed LG_0l modes on nano-dielectric spheres with low and high refractive indices. We analyze how trapping efficiency depends on the particle’s refractive index and the beam’s azimuthal mode in terms of force magnitude, effective trapping region, and the number of trapping zones. The theoretical model considers dielectric spheres immersed in an oil medium and irradiated by the beam. The results demonstrate that a pulsed LG_0l beam achieves higher and more stable trapping efficiency for small azimuthal mode values, short pulse duration, and particles with high refractive indices. Theoretical analysis suggests that the LG_0l mode enables 2D trapping of particles with bottle-beam-like control.