title: Torque detection using Brownian fluctuations.
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.
authors.affiliation: ICFO-Institut de Ciencies Fotoniques, Mediterranean Technology Park, 08860, Castelldefels (Barcelona), Spain.
authors.forename: Giovanni
authors.initials: G
authors.lastname: Volpe
authors.forename: Dmitri
authors.initials: D
authors.lastname: Petrov