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Influence of non-conservative optical forces on the dynamics of optically trapped colloidal spheres: The fountain of probability by Roichman, Yohai; Sun, Bo; Stolarski, Allan; Grier, David G. is a scholarly article available to read on EtoBox.

What is Influence of non-conservative optical forces on the dynamics of optically trapped colloidal spheres: The fountain of probability about?

We demonstrate both experimentally and theoretically that a colloidal sphere trapped in a static optical tweezer does not come to equilibrium, but rather reaches a steady state in which its probability flux traces out a toroidal vortex. This non-equilibrium behavior can be ascribed to a subtle bias of thermal fluctuations by non-conservative optical forces. The circulating sphere therefore acts as a Brownian motor. We briefly discuss ramifications of this effect for studies in which optical tweezers have been treated as potential energy wells.

Author

Roichman, Yohai; Sun, Bo; Stolarski, Allan; Grier, David G.

Published

2008

Language

EN