Observation of Flux Reversal in a Symmetric Optical Thermal Ratchet

Details Observation of Flux Reversal in a Symmetric Optical Thermal Ratchet Observation of Flux Reversal in a Symmetric Optical Thermal Ratchet

2004-11-29

arxiv.org/abs/cond-mat/0411731v1

Physics

Condensed Matter

Soft Condensed Matter

4 pages, 2 figures, submitted for publication in Physical Review Letters

Scientific paper

10.1103/PhysRevLett.94.110601

We demonstrate that a cycle of three holographic optical trapping patterns can implement a thermal ratchet for diffusing colloidal spheres, and that the ratchet-driven transport displays flux reversal as a function of the cycle frequency and the inter-trap separation. Unlike previously described ratchet models, the approach we describe involves three equivalent states, each of which is locally and globally spatially symmetric, with spatiotemporal symmetry being broken by the sequence of states.

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