Optimizing the optical trapping stiffness of holographically trapped microrods using high-speed video tracking

Phillips, D., Carberry, D.M., Simpson, S.H., Schäfer, H., Steinhart, M., Bowman, R., Gibson, G. , Padgett, M. , Hanna, S. and Miles, M.J. (2011) Optimizing the optical trapping stiffness of holographically trapped microrods using high-speed video tracking. Journal of Optics, 13(4), 044023. (doi: 10.1088/2040-8978/13/4/044023)

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Publisher's URL: http://dx.doi.org/10.1088/2040-8978/13/4/044023

Abstract

Dielectric microrods can be trapped horizontally in pairs of holographically controlled optical traps. External forces acting on these microrods are registered via the rotational and translational displacement of the microrod relative to the traps. In the following paper we demonstrate accurate, real-time tracking of this displacement in two dimensions. The precision of the method is estimated and the translational and rotational stiffness coefficients of the trapped microrod are evaluated by analysing the thermal motion and the Stokes drag. The variation of these stiffness coefficients relative to the displacement of the traps from the ends of the microrods is measured, and optimal trapping conditions are located.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Gibson, Dr Graham and Phillips, Dr David and Bowman, Mr Richard and Padgett, Professor Miles
Authors: Phillips, D., Carberry, D.M., Simpson, S.H., Schäfer, H., Steinhart, M., Bowman, R., Gibson, G., Padgett, M., Hanna, S., and Miles, M.J.
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:Journal of Optics
Publisher:IOP Publishing
ISSN:2040-8978
ISSN (Online):2040-8986
Published Online:01 January 2011

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
542471Optical Atomic Force MicroscopyMiles PadgettEngineering & Physical Sciences Research Council (EPSRC)EP/I007822/1Physics and Astronomy