Holographic tracking and sizing of optically trapped microprobes in diamond anvil cells

Saglimbeni, F., Bianchi, S., Gibson, G. , Bowman, R., Padgett, M. and Di Leonardo, R. (2016) Holographic tracking and sizing of optically trapped microprobes in diamond anvil cells. Optics Express, 24(23), pp. 27009-27015. (doi: 10.1364/OE.24.027009) (PMID:27857428)

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We demonstrate that Digital Holographic Microscopy can be used for accurate 3D tracking and sizing of a colloidal probe trapped in a diamond anvil cell (DAC). Polystyrene beads were optically trapped in water up to Gigapascal pressures while simultaneously recording in-line holograms at 1 KHz frame rate. Using Lorenz-Mie scattering theory to fit interference patterns, we detected a 10% shrinking in the bead’s radius due to the high applied pressure. Accurate bead sizing is crucial for obtaining reliable viscosity measurements and provides a convenient optical tool for the determination of the bulk modulus of probe material. Our technique may provide a new method for pressure measurements inside a DAC.

Item Type:Articles
Additional Information:F.S., S.B. and R.D.L. acknowledge funding from the European Research Council under the European Union’s Seventh Framework Programme (FP7/2007-2013)/ERC grant agreement no. 307940. R.W.B. acknowledges financial support from Queens’ College, Cambridge and the Royal Commission for the Exhibition of 1851.
Glasgow Author(s) Enlighten ID:Gibson, Dr Graham and Padgett, Professor Miles and Bowman, Mr Richard
Authors: Saglimbeni, F., Bianchi, S., Gibson, G., Bowman, R., Padgett, M., and Di Leonardo, R.
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:Optics Express
Publisher:Optical Society of America
ISSN (Online):1094-4087
Published Online:11 November 2016
Copyright Holders:Copyright © 2016 Optical Society of America
First Published:First published in Optics Express 24(23):27009-27015
Publisher Policy:Reproduced in accordance with the copyright policy of the publisher

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