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Proceedings Paper

An optically driven pump for microfluidics
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Paper Abstract

Central to the success of microfluidic systems has been the development of innovative methods for the manipulation of fluids within microchannels. We demonstrate a method for generating flow within a microfluidic channel using an optically driven pump. The pump consists of two counter rotating birefringent vaterite particles trapped within a microfluidic channel and driven using optical tweezers. The transfer of spin angular momentum from a circularly polarised laser beam rotates the particles at up to 10 Hz. We show the that the pump is able to displace fluid in microchannels, with flow rates of up to 200 μm3 s-1 (200 fL s-1). The direction of fluid pumping can be reversed by altering the sense of the rotation of the vaterite beads. We also incorporate a novel optical sensing method, based upon an additional probe particle, trapped within separate optical tweezers, enabling us to map the magnitude and direction of fluid flow within the channel. The techniques described in the paper have potential to be extended to drive an integrated lab-on-chip device, where pumping, flow measurement and optical sensing could all be achieved by structuring a single laser beam.

Paper Details

Date Published: 11 September 2006
PDF: 6 pages
Proc. SPIE 6326, Optical Trapping and Optical Micromanipulation III, 63260W (11 September 2006); doi: 10.1117/12.683462
Show Author Affiliations
Hasan Mushfique, Univ. of Glasgow (United Kingdom)
Jonathan Leach, Univ. of Glasgow (United Kingdom)
Roberto di Leonardo, Univ. of Glasgow (United Kingdom)
INFM-CRS SOFT (Italy)
Miles Padgett, Univ. of Glasgow (United Kingdom)
Jon Cooper, Univ. of Glasgow (United Kingdom)


Published in SPIE Proceedings Vol. 6326:
Optical Trapping and Optical Micromanipulation III
Kishan Dholakia; Gabriel C. Spalding, Editor(s)

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