Multipoint holographic optical velocimetry in microfluidic systems

Di Leonardo, R., Leach, J., Mushfique, H., Cooper, J.M. , Ruocco, G. and Padgett, M.J. (2006) Multipoint holographic optical velocimetry in microfluidic systems. Physical Review Letters, 96(13), p. 134502. (doi:10.1103/PhysRevLett.96.134502)

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Publisher's URL: http://dx.doi.org/10.1103/PhysRevLett.96.134502

Abstract

We show how holographic optical trapping can be used for the multipoint measurement of fluid flow in microscopic geometries. An array of microprobes can be simultaneously trapped and used to map out the fluid flow in a microfluidic device. The optical traps are alternately turned on and off such that the probe particles are displaced by the flow of the surrounding fluid and then retrapped. The particles' displacements are monitored by digital video microscopy and directly converted into velocity field values. This technique enables the measurement of a two-dimensional flow field at points arbitrarily distributed in a three-dimensional volume. The validity of the technique is demonstrated for the case of the flow around a spinning sphere and the flow at the outlet of a microchannel.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Padgett, Professor Miles and Cooper, Professor Jonathan and Leach, Mr Jonathan
Authors: Di Leonardo, R., Leach, J., Mushfique, H., Cooper, J.M., Ruocco, G., and Padgett, M.J.
College/School:College of Science and Engineering > School of Engineering > Biomedical Engineering
College of Science and Engineering > School of Physics and Astronomy
Journal Name:Physical Review Letters
Journal Abbr.:Phys. Rev. Lett.
Publisher:American Physical Society
ISSN:0031-9007
ISSN (Online):1079-7114

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
362881Micro-fluidic analytical systems driven and interrogated with holographic opticsMiles PadgettEngineering & Physical Sciences Research Council (EPSRC)GR/S73006/01Physics and Astronomy