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Proceedings Paper

Optical manipulation of 'drops on rails' in two dimensional microfluidic devices
Author(s): C. McDougall; E. Fradet; C. N. Baroud; D. McGloin
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Paper Abstract

When using single microfluidic droplets as isolated biological/chemical micro-reactors or arrays of droplets as 2D assaying tools, control over droplet placement is crucial to successful device implementation. Here we demonstrate a combined mechanical and optical approach to generate highly controllable arrays of droplets in pre-determined 'rails and anchors' patterns on a two-dimensional plane. The technique combines passive mechanical forcing with selective laser action. Passive mechanical forcing provides a vehicle for droplet transport and storage and laser induced optical forcing is employed for stopping, guiding or derailing droplets as they pass through the chip. In this way intelligent operations can be performed upon arrays of droplets such as sorting, merging to initiate chemical reactions or selective removal of droplets from a predefined array. The usergenerated array may then be held static against a mean flow for prolonged observation.

Paper Details

Date Published: 9 September 2011
PDF: 7 pages
Proc. SPIE 8097, Optical Trapping and Optical Micromanipulation VIII, 809710 (9 September 2011); doi: 10.1117/12.893346
Show Author Affiliations
C. McDougall, Univ. of Dundee (United Kingdom)
E. Fradet, Ecole Polytechnique, CNRS (France)
C. N. Baroud, Ecole Polytechnique, CNRS (France)
D. McGloin, Univ. of Dundee (United Kingdom)

Published in SPIE Proceedings Vol. 8097:
Optical Trapping and Optical Micromanipulation VIII
Kishan Dholakia; Gabriel C. Spalding, Editor(s)

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