Dynamic radiation force of a pulsed Gaussian beam acting on a Rayleigh dielectric sphere

TL;DR

This paper analyzes how pulsed Gaussian beams produce dynamic radiation forces on Rayleigh dielectric spheres, revealing how pulse duration affects trapping, guiding, and manipulation capabilities.

Contribution

It provides analytical expressions for the scattering and ponderomotive forces induced by pulsed Gaussian beams on dielectric spheres, highlighting the impact of pulse duration on force enhancement and particle manipulation.

Findings

Radiation force increases as pulse duration decreases.

Long pulses enable stable trapping and manipulation.

Short pulses facilitate guiding and moving small particles.

Abstract

We investigate the dynamic evolution of the radiation forces produced by the pulsed Gaussian beams acting on a Rayleigh dielectric sphere. We derive the analytical expressions for the scattering force and all components of the ponderomotive force induced by the pulsed Gaussian beams. Our analysis shows that the radiation force, for both the transverse and longitudinal components, can be greatly enhanced as the pulse duration decreases. It is further found that for the pulse with long pulse duration, it can be used for the stable trapping and manipulating the particle, while for the pulse with short pulse duration it may be used for guiding and moving the small dielectric particle. Finally we discuss the stability conditions of the effective manipulating the particle by the pulsed beam.