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Real time characterization of hydrodynamics in optically trapped networks of micro‐particles
Author(s) -
Curran Arran,
Yao Alison,
Gibson Graham,
Bowman Richard,
Cooper Jon,
Padgett Miles
Publication year - 2010
Publication title -
journal of biophotonics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.877
H-Index - 66
eISSN - 1864-0648
pISSN - 1864-063X
DOI - 10.1002/jbio.201000003
Subject(s) - optical tweezers , particle (ecology) , tensor (intrinsic definition) , physics , distortion (music) , spheres , holography , planar , characterization (materials science) , boundary (topology) , viscosity , normal mode , boundary value problem , molecular physics , optics , classical mechanics , acoustics , mathematical analysis , optoelectronics , quantum mechanics , geometry , amplifier , vibration , computer science , mathematics , oceanography , computer graphics (images) , cmos , astronomy , geology
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. (© 2010 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)