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  • Title: Flux reversal in a two-state symmetric optical thermal ratchet.
    Author: Lee SH, Grier DG.
    Journal: Phys Rev E Stat Nonlin Soft Matter Phys; 2005 Jun; 71(6 Pt 1):060102. PubMed ID: 16089710.
    Abstract:
    A Brownian particle's random motions can be rectified by a periodic potential-energy landscape that alternates between two states, even if both states are spatially symmetric. If the two states differ only by a discrete translation, the direction of the ratchet-driven current can be reversed by changing their relative durations. We experimentally demonstrate flux reversal in a symmetric two-state ratchet by tracking the motions of colloidal spheres moving through large arrays of discrete potential-energy wells created with dynamic holographic optical tweezers. The model's simplicity and high degree of symmetry suggest possible applications in molecular-scale motors.
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