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Virtual Journal for Biomedical Optics

Virtual Journal for Biomedical Optics


  • Editor: Gregory W. Faris
  • Vol. 4, Iss. 9 — Sep. 4, 2009

Optothermorheological flow manipulation

Mekala Krishnan, Joonsik Park, and David Erickson  »View Author Affiliations

Optics Letters, Vol. 34, Issue 13, pp. 1976-1978 (2009)

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Optical methods for microfluidic flow manipulation offer a flexible, noncontact technique for both fluid actuation and valving. At present, however, such techniques are limited by their high laser power requirements, low achieved flow rates, or poor valve switching times. Here we demonstrate a microfluidic valving technique based on optothermorheological manipulation using a low-power 40 mW laser with switching times on the order of 1 s at high flow rates of 1 mm s . In our approach a laser beam incident on an absorbing substrate is used to locally heat a thermorheological fluid flowing in a microfluidic channel. The resulting gelation in the heated region creates a reversible fluid valve.

© 2009 Optical Society of America

OCIS Codes
(160.6060) Materials : Solgel
(160.6840) Materials : Thermo-optical materials

ToC Category:

Original Manuscript: April 6, 2009
Revised Manuscript: May 20, 2009
Manuscript Accepted: June 3, 2009
Published: June 24, 2009

Virtual Issues
Vol. 4, Iss. 9 Virtual Journal for Biomedical Optics

Mekala Krishnan, Joonsik Park, and David Erickson, "Optothermorheological flow manipulation," Opt. Lett. 34, 1976-1978 (2009)

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