## Laser-Induced Migration of Oil Particles Suspended in a Water Matrix

Applied Optics, Vol. 41, Issue 30, pp. 6420-6430 (2002)

http://dx.doi.org/10.1364/AO.41.006420

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### Abstract

The thermoconvective flow induced in oil samples and oil-in-water emulsions by irradiation with a laser beam is studied experimentally. The samples are irradiated by He-Ne and CO<sub>2</sub> lasers at different power levels. Time-resolved records of temperature and surface waves that propagate in a liquid surface are presented. In laser-heated emulsions the thermoconvective flow leads the dispersed oil droplets to the water-free surface where they agglomerate to form a floating oil layer. The reflected light beam is formed by a speckle pattern whose intensity and contrast show a spiking, quasi-periodic time variation. A theoretical model is proposed to explain this phenomenon.

© 2002 Optical Society of America

**OCIS Codes**

(120.0280) Instrumentation, measurement, and metrology : Remote sensing and sensors

(240.6690) Optics at surfaces : Surface waves

(290.5850) Scattering : Scattering, particles

(310.3840) Thin films : Materials and process characterization

(350.5340) Other areas of optics : Photothermal effects

**Citation**

Germán Da Costa, Juan Enrique Parra, and Felix Mosqueda, "Laser-Induced Migration of Oil Particles Suspended in a Water Matrix," Appl. Opt. **41**, 6420-6430 (2002)

http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-41-30-6420

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