Resonances arising from hydrodynamic memory in Brownian motion

Thomas Franosch, Matthias Grimm, Maxim Belushkin, Flavio M. Mor, Giuseppe Foffi, László Forró and Sylvia Jeney ()
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Thomas Franosch: Institut für Theoretische Physik, Friedrich-Alexander-Universität Erlangen-Nürnberg, Staudtstraße 7
Matthias Grimm: M. E. Müller Institute for Structural Biology, Biozentrum, University of Basel, Klingelbergstrasse 70
Maxim Belushkin: Institute of Theoretical Physics, Ecole Polytechnique Fédérale de Lausanne (EPFL)
Flavio M. Mor: Laboratory of Physics of Complex Matter, Ecole Polytechnique Fédérale de Lausanne (EPFL)
Giuseppe Foffi: Institute of Theoretical Physics, Ecole Polytechnique Fédérale de Lausanne (EPFL)
László Forró: Laboratory of Physics of Complex Matter, Ecole Polytechnique Fédérale de Lausanne (EPFL)
Sylvia Jeney: M. E. Müller Institute for Structural Biology, Biozentrum, University of Basel, Klingelbergstrasse 70

Nature, 2011, vol. 478, issue 7367, 85-88

Abstract: Brownian motion — now in colour In Brownian motion, a particle's movement is driven by rapid collisions with the surrounding solvent molecules; this thermal force is assumed to be random and characterized by a Gaussian white noise spectrum. Friction between the particle and the viscous solvent damps its motion. However, the displaced fluid acts back on the particle, giving rise to a hydrodynamic 'memory' and thermal forces with a coloured noise spectrum. Direct experimental observation of a coloured spectrum has proved difficult. Sylvia Jeney and colleagues now report clear evidence for it in measurements of the Brownian fluctuations of a microsphere in a strong optical trap. They anticipate that such details in thermal noise could be exploited for the development of new types of sensors and particle-based assays in lab-on-a-chip applications.

Date: 2011
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DOI: 10.1038/nature10498

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