Trapping Two Types of Particles Using a Laguerre–Gaussian Correlated Schell-Model Beam

Abstract

Based on the Rayleigh scattering theory, the radiation forces and the trap stiffness on Rayleigh dielectric sphere induced by a focused Laguerre-Gaussian correlated Schell-model (LGCSM) beam are theoretically studied. It is found that by choosing the appropriate transverse coherence width, mode orders, transverse beam width, and focus lengths, a Rayleigh particle whose refractive index is larger or smaller than the ambient medium can be trapped. Our results will have some theoretical reference value for optical trapping.

Keywords

• Laguerre-Gaussian correlated Schell-model beam (LGCSM)
• radiation forces
• trap stiffness.