Real time characterization of hydrodynamics in optically trapped networks of micro-particles

Curran, A., Yao, A., Gibson, G. , Bowman, R., Cooper, J.M. and Padgett, M. (2010) Real time characterization of hydrodynamics in optically trapped networks of micro-particles. Journal of Biophotonics, 3(4), pp. 244-251. (doi: 10.1002/jbio.201000003)

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The hydrodynamic interactions of micro-silica spheres trapped in a variety of networks using holographic optical tweezers are measured and characterized in terms of their predicted eigenmodes. The characteristic eigenmodes of the networks are distinguishable within 20-40 seconds of acquisition time. Three different multi-particle networks are considered; an eight-particle linear chain, a nine-particle square grid and, finally, an eight-particle ring. The eigenmodes and their decay rates are shown to behave as predicted by the Oseen tensor and the Langevin equation, respectively. Finally, we demonstrate the potential of using our micro-ring as a non-invasive sensor to the local environmental viscosity, by showing the distortion of the eigenmode spectrum due to the proximity of a planar boundary. The eight particle ring that may lend itself to a micro-listening device. Superimposed are the eigenvectors of one of the hydrodynamic modes

Item Type:Articles
Additional Information:Special Issue: Innovative Photonic Micromanipulation Tools.
Keywords:complex fluids and colloidal sytems, conventional optical microscopes, device, experimental tests, imaging and optical processing, tweezers
Glasgow Author(s) Enlighten ID:Gibson, Dr Graham and Padgett, Professor Miles and Cooper, Professor Jonathan and Curran, Dr Arran and Yao, Dr Alison
Authors: Curran, A., Yao, A., Gibson, G., Bowman, R., Cooper, J.M., and Padgett, M.
College/School:College of Science and Engineering > School of Engineering > Biomedical Engineering
College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
Journal Name:Journal of Biophotonics
ISSN (Online):1864-0648
Published Online:18 March 2010

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