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Proceedings Paper

Implementing optical tweezers at high pressure in a diamond anvil cell
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Paper Abstract

Diamond anvil cells allow us to study the behaviour of materials at pressures up to hundreds of gigaPascals in a small and convenient instrument, however physical access to the sample is impossible once it is pressurised. Optical tweezers use tightly focussed lasers to trap and hold microscopic objects, and their ability to measure nanometric displacements and femtonewton forces makes them ubiquitous across the nano and bio sciences. We show that optical tweezers can be used to hold and manipulate particles in such a cell, in the ``macro tweezers'' geometry allowing us to use objective lenses with a higher working distance. Traps are structured to overcome the limitations imposed by the sample cell. Wedemonstrate the effectiveness of the technique by measuring water's viscosity up to 1.2 GPa. The maximum pressure reached was limited by the water crystallising under pressure.

Paper Details

Date Published: 5 March 2013
PDF: 8 pages
Proc. SPIE 8637, Complex Light and Optical Forces VII, 863718 (5 March 2013); doi: 10.1117/12.2015003
Show Author Affiliations
Richard W. Bowman, Univ. of Glasgow (United Kingdom)
Univ. of Cambridge (United Kingdom)
Filippo Saglimbeni, Univ. degli Studi di Roma La Sapienza (Italy)
Graham M. Gibson, Univ. of Glasgow (United Kingdom)
Roberto Di Leonardo, Univ. degli Studi di Roma La Sapienza (Italy)
Miles J. Padgett, Univ. of Glasgow (United Kingdom)

Published in SPIE Proceedings Vol. 8637:
Complex Light and Optical Forces VII
Jesper Glückstad; David L. Andrews; Enrique J. Galvez, Editor(s)

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