Dresden 2003 – wissenschaftliches Programm
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DY: Dynamik und Statistische Physik
DY 46: Poster
DY 46.10: Poster
Donnerstag, 27. März 2003, 15:30–18:00, P1
Stochastic Resonance in a Colloidal System — •Dusan Babic1,2, Carmen Schmitt1, and Clemens Bechinger1 — 1Fachbereich Physik, Universität Konstanz, 78457 Konstanz — 2Physics Department, University of Ljubljana
In recent years the phenomenon of stochastic resonance, i. e. noise-enhanced synchronization driven by weak periodic signals, has attracted considerable attention. However, even though there has been much effort on the theoretical side, only a few experiments have been done so far.
Colloids as Brownian particles are a system very much suitable for stochastic resonance experiments because of the No-dqbuilt inNo-dq noise and our ability to precisely control its behaviour. A tool of choice for this kind of experiments is optical tweezers. Such an experiment has already been done in 1992 [1] but it didn’t show the characteristics of stochastic resonance correctly. In our experiment we propose to use fast optical tweezers based on an acousto-optic deflection system. This should enable us to reproduce and improve previous experiments as well as to perform new ones involving more complexly shaped potentials, modulation patterns, and many particles.
[1] A. Simon and A. Liebchaber, Escape and Synchronization of a Brownian Particle, PRL 68, 3375 (1992)