Theoretical study on the rotation of particles driven by Gaussian beam
高斯波束致微粒旋转的理论研究

Based on the fact that the polarized beam is composed of L-photon and D-photon, the expressions of the radiation trapping forces and torques of spherical particle exerted by polarized Gaussian beam are obtained in the framework of the generalized Lorenz-Mie theory. The reasons of the two different rotations of particles driven by circularly polarized Gaussian beam are analyzed and explained in combination with the quantum properties of photon. Then numerical simulations are performed for the two kinds of torques acted on the particles by polarized Gaussian beam, and the effects on the torques and optically driven rotations of the radius, relative refractive index, absorbing coefficient of the particle and waist radius of the beam are discussed.