Shape-induced force fields in optical trapping

Phillips, D. B., Padgett, M. J. , Hannah, S., Ho, Y.-L. D., Carberry, D. M., Miles, M. J. and Simpson, S. H. (2014) Shape-induced force fields in optical trapping. Nature Photonics, 8(5), pp. 400-405. (doi: 10.1038/nphoton.2014.74)

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Advances in optical tweezers, coupled with the proliferation of two-photon polymerization systems, mean that it is now becoming routine to fabricate and trap non-spherical particles. The shaping of both light beams and particles allows fine control over the flow of momentum from the optical to mechanical regimes. However, understanding and predicting the behaviour of such systems is highly complex in comparison with the traditional optically trapped microsphere. In this Article, we present a conceptually new and simple approach based on the nature of the optical force density. We illustrate the method through the design and fabrication of a shaped particle capable of acting as a passive force clamp, and we demonstrate its use as an optically trapped probe for imaging surface topography. Further applications of the design rules highlighted here may lead to new sensors for probing biomolecule mechanics, as well as to the development of optically actuated micromachines.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Padgett, Professor Miles and Hannah, Mr Stuart and Phillips, Dr David
Authors: Phillips, D. B., Padgett, M. J., Hannah, S., Ho, Y.-L. D., Carberry, D. M., Miles, M. J., and Simpson, S. H.
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:Nature Photonics
Publisher:Nature Publishing Group
ISSN (Online):1749-4893

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
542471Optical Atomic Force MicroscopyMiles PadgettEngineering & Physical Sciences Research Council (EPSRC)EP/I007822/1P&A - PHYSICS & ASTRONOMY