Optical shield: measuring viscosity of turbid fluids using optical tweezers

Lee, M.P., Curran, A., Gibson, G.M. , Tassieri, M. , Heckenberg, N.R. and Padgett, M.J. (2012) Optical shield: measuring viscosity of turbid fluids using optical tweezers. Optics Express, 20(11), pp. 12127-12132. (doi: 10.1364/OE.20.012127)

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The viscosity of a fluid can be measured by tracking the motion of a suspended micron-sized particle trapped by optical tweezers. However, when the particle density is high, additional particles entering the trap compromise the tracking procedure and degrade the accuracy of the measurement. In this work we introduce an additional Laguerre–Gaussian, i.e. annular, beam surrounding the trap, acting as an optical shield to exclude contaminating particles.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Gibson, Dr Graham and Padgett, Professor Miles and Tassieri, Dr Manlio and Curran, Dr Arran
Authors: Lee, M.P., Curran, A., Gibson, G.M., Tassieri, M., Heckenberg, N.R., 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:Optics Express
Copyright Holders:Copyright © 2012 Optical Society of America
First Published:First published in Optics Express 20(11):12127-12132
Publisher Policy:Reproduced in accordance with the copyright policy of the publisher

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
534472Rheology at the Microscale: New Tools for Bio-analysisManlio TassieriEngineering & Physical Sciences Research Council (EPSRC)10216/101Biomedical Engineering