Force sensing with a shaped dielectric micro-tool

Phillips, D., Simpson, S.H., Grieve, J.A., Bowman, R., Gibson, G.M. , Padgett, M.J. , Rarity, J.G., Hanna, S., Miles, M.J. and Carberry, D.M. (2012) Force sensing with a shaped dielectric micro-tool. EPL (Europhysics Letters), 99(5), p. 58004. (doi: 10.1209/0295-5075/99/58004)

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Publisher's URL: http://dx.doi.org/10.1209/0295-5075/99/58004

Abstract

We analyse the thermal motion of a holographically trapped non-spherical force probe, capable of interrogating arbitrary samples with nanometer resolution. High speed video stereo-microscopy is used to track the translational and rotational coordinates of the micro-tool in three dimensions, and the complete 6 × 6 stiffness matrix for the system is determined using equipartition theorem. The Brownian motion of the extended structure is described in terms of a continuous distribution of thermal ellipsoids. A centre of optical stress, at which rotational and translational motion is uncoupled, is observed and controlled. Once calibrated, the micro-tool is deployed in two modes of operation: as a force sensor with <150 femto-Newton sensitivity, and in a novel form of photonic force microscopy.

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., Simpson, S.H., Grieve, J.A., Bowman, R., Gibson, G.M., Padgett, M.J., Rarity, J.G., Hanna, S., Miles, M.J., and Carberry, D.M.
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:EPL (Europhysics Letters)
ISSN:0295-5075
ISSN (Online):1286-4854
Published Online:12 September 2012

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