Torque detection using brownian fluctuations

Date
2006-11-24
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Source Title
Physical Review Letters
Print ISSN
0031-9007
Electronic ISSN
1079-7114
Publisher
The American Physical Society
Volume
97
Issue
21
Pages
1 - 4
Language
English
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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.

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