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Computer simulation of dynamics and light-scattering properties of Brownian particles under laser radiation pressure

Dynamics and light-scattering properties of the Brownian particles in colloidal suspensions under an influence of the radiation pressure force of an illuminating laser beam are investigated by means of computer simulations using the Fokker-Planck equation and the generalized Lorenz-Mie theory. Dynamic behavior of the particles and a temporal correlation function of intensity fluctuations of the light scattered by these particles are calculated for various factors of particle size and power of the illuminating laser beam. Results of the simulations support the experimental observations of deformations in the temporal correlation functions of the scattered light and their dependencies on a size of the particles and a power of the laser. From simulation results of the dynamics of particles, it is found that these changes in the correlation function come from suppression in the radial direction of the laser beam and an acceleration in the axial direction of the beam, of a random motion of the particles.