Transverse optical trapping of spherical particle with strong absorption in a focused Gaussian beam

摘要

In this work, the transverse optical trapping of spherical particle with strong absorption is studied in geometrical optics model by numerical simulation. In our work, the exact expressions of wave vector are used instead of traditional approximate expressions, and the transverse optical trapping force acting on a spherical particle due to strong absorption is calculated when the particle is illuminated by a focused Gaussian beam of TEMOo mode. The calculated results show that stable transverse optical trapping positions only exist when the center of the spherical particle is located in front of the focus of the beam. Our results also reveal that the trapping positions are decided by the radius of the beam waist ω_0. The magnitude of transverse optical trapping force and the stiffness of optical trapping decrease with the increase in ω_0.