Real time characterization of hydrodynamics in optically trapped networks of micro-particles
Curran, Arran and Yao, Alison M. and Gibson, Graham M. and Bowman, Richard and Cooper, Jon M. and Padgett, Miles L. (2010) Real time characterization of hydrodynamics in optically trapped networks of micro-particles. Journal of Biophotonics, 3 (4). pp. 244-251. ISSN 1864-063X (https://doi.org/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.
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Item type: Article ID code: 30990 Dates: DateEventApril 2010PublishedSubjects: Science > Physics Department: Faculty of Science > Physics Depositing user: Pure Administrator Date deposited: 14 May 2011 09:03 Last modified: 08 Apr 2024 19:03 URI: https://strathprints.strath.ac.uk/id/eprint/30990