Abstract
Fluorescence correlation spectroscopy (FCS) was applied to investigate molecular translational diffusion in the solution of water, ethylene glycol, and heavy water under gradient light field of a near infrared (NIR) laser beam. The diffusion times of Rhodamine-6G in ethylene glycol and Rhodamine-123 in water became faster with an increase in the NIR laser power owing to absorption of the NIR light by the solvents. We also applied the radiation pressure of the NIR laser light to cadmium telluride (CdTe) nanoparticles dispersed in heavy water, resulting in increase in the average number of the CdTe particles in the confocal volume with increasing the NIR laser power.
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