Trapping and manipulation of microparticles using laser-induced convection currents and photophoresis

Flores-Flores, E., Torres-Hurtado, S.A., Páez, R., Ruiz, U., Beltrán-Pérez, G., Neale, S.L., Ramirez-San-Juan, J.C. and Ramos-García, R. (2015) Trapping and manipulation of microparticles using laser-induced convection currents and photophoresis. Optics Express, 6(10), pp. 4079-4087. (doi:10.1364/BOE.6.004079)

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Abstract

In this work we demonstrate optical trapping and manipulation of microparticles suspended in water due to laser-induced convection currents. Convection currents are generated due to laser light absorption in an hydrogenated amorphous silicon (a:Si-H) thin film. The particles are dragged towards the beam's center by the convection currents (Stokes drag force) allowing trapping with powers as low as 0.8 mW. However, for powers >3 mW trapped particles form a ring around the beam due to two competing forces: Stokes drag and thermo-photophoretic forces. Additionally, we show that dynamic beam shaping can be used to trap and manipulate multiple particles by photophotophoresis without the need of lithographically created resistive heaters.

Item Type:Articles
Additional Information:©2015 Optical Society of America. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modifications of the content of this paper are prohibited.
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Neale, Dr Steven
Authors: Flores-Flores, E., Torres-Hurtado, S.A., Páez, R., Ruiz, U., Beltrán-Pérez, G., Neale, S.L., Ramirez-San-Juan, J.C., and Ramos-García, R.
College/School:College of Science and Engineering > School of Engineering > Biomedical Engineering
Journal Name:Optics Express
Publisher:Optical Society of America
ISSN:1094-4087
ISSN (Online):2156-7085
Copyright Holders:Copyright © 2015 Optical Society of America
First Published:First published in Optics Express 6(10):4079-4087
Publisher Policy:Reproduced in accordance with the copyright policy of the publisher

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