Observation of flux reversal in a symmetric optical thermal ratchet

Sang Hyuk Lee, Kosta Ladavac, Marco Polin, David G. Grier

    Research output: Contribution to journalArticlepeer-review


    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 intertrap 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.

    Original languageEnglish (US)
    Article number110601
    JournalPhysical Review Letters
    Issue number11
    StatePublished - Mar 25 2005

    ASJC Scopus subject areas

    • General Physics and Astronomy


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