抄録
An investigation of the optical radiation pressure for the migration of microparticle in light-absorbing liquid is described in this paper. Optical radiation pressure from parallel or gently focused beam can generate a force on particles in liquid along the propagation direction of the ray. The viscosity reduction caused by the temperature rise due to the absorption of the laser beam induces the decrease in the viscous drag for the particle, and consequently, the migration can be promoted. Theoretical calculation based on ray optics model was performed. In experiments using microchannel and polystyrene particle with the diameter of 1.9μm, enhancement of migration velocity up to 65 % was recognized. The increment of the velocity corresponds to the local temperature rise measured by laser-induced fluorescence technique.
