Trapping and manipulation of microparticles using Rayleigh convection generated by laser-induced heating of an absorbing thin film

S. A. Torres-Hurtado; E. Flores-Flores; G. Beltran-Perez; Steven L. Neale; J. C. Ramirez-San-Juan; R. Ramos-García

doi:10.1117/12.2061266

16 September 2014 Trapping and manipulation of microparticles using Rayleigh convection generated by laser-induced heating of an absorbing thin film

S. A. Torres-Hurtado, E. Flores-Flores, G. Beltran-Perez, Steven L. Neale, J. C. Ramirez-San-Juan, R. Ramos-García

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Proceedings Volume 9164, Optical Trapping and Optical Micromanipulation XI; 91643C (2014) https://doi.org/10.1117/12.2061266
Event: SPIE NanoScience + Engineering, 2014, San Diego, California, United States

Abstract

We show that trapping and manipulation of microparticles can be achieved by Rayleigh convection currents using a low power lasers. Light absorbed by thin film of amorphous silicon (a:Si) creates the convection currents. In contrast to previous works, we show that multiple trapping can be achieved using solid microparticles without the creation of vapor bubbles. For low power (~1 mW), particles are trapped at the center of the beam, however at higher powers (~3 mW) particles are trapped on a ring around the beam due to two competing forces: Stokes and thermophoretic forces. Numerical simulations confirm that thermal gradients are responsible for the trapping mechanism.

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S. A. Torres-Hurtado, E. Flores-Flores, G. Beltran-Perez, Steven L. Neale, J. C. Ramirez-San-Juan, and R. Ramos-García "Trapping and manipulation of microparticles using Rayleigh convection generated by laser-induced heating of an absorbing thin film", Proc. SPIE 9164, Optical Trapping and Optical Micromanipulation XI, 91643C (16 September 2014); https://doi.org/10.1117/12.2061266

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