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Torque detection using Brownian fluctuations

Journal article
Authors Giovanni Volpe
Dmitri Petrov
Published in Physical Review Letters
Volume 97
ISSN 00319007
Publication year 2006
Published at
Language en
Subject categories Physical Sciences

Abstract

We report the statistical analysis of the movement of a submicron particle confined in a harmonic potential in the presence of a torque. The absolute value of the torque can be found from the auto- and cross-correlation functions of the particle’s coordinates. We experimentally prove this analysis by detecting the torque produced onto an optically trapped particle by an optical beam with orbital angular momentum. © 2006 The American Physical Society.

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