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, Professor 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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