DYNAMICS AND DYNAMIC LIGHT-SCATTERING PROPERTIES OF BROWNIAN PARTICLES UNDER LASER-RADIATION PRESSURE

Dynamics and light-scattering properties of Brownian particles in coll oidal suspensions under the influence of the radiation pressure force of an illuminating laser beam are investigated by means of computer si mulations using the Fokker-Planck equation and generalized Lorenz-Mie theory. Dynamic behaviour of the particles and a temporal correlation function of intensity fluctuations of the light scattered by these par ticles are calculated for various factors of particle size and power o f the illuminating laser beam. Results of the simulations support the experimental observations of deformation in the temporal correlation f unctions of the scattered light and their dependences on the size of t he particles and the power of the laser. From simulation results for t he dynamics of particles, it is found that these changes in the correl ation function arise from suppression of the random motion of the part icles in the radial direction of the laser beam and induction of an av erage uniform motion in the beam propagation direction.