Anomalous vibrational dispersion in holographically trapped colloidal arrays

Marco Polin, David G. Grier, Stephen R. Quake

    Research output: Contribution to journalArticlepeer-review


    Colloidal spheres localized in an array of harmonic wells form a thermally excited, viscously damped dynamical system capable of supporting propagating elastic waves. Experimentally realized with micrometer-scale polystyrene spheres localized in a line of holographic optical traps, the hydrodynamically coupled array's behavior is quantitatively explained by a model based on the Oseen superposition approximation. The spheres' purely dissipative coupling is predicted to mediate a crossover to a regime of underdamped propagating elastic waves with uniformly negative group velocities that has yet to be verified experimentally.

    Original languageEnglish (US)
    Article number088101
    JournalPhysical Review Letters
    Issue number8
    StatePublished - 2006

    ASJC Scopus subject areas

    • General Physics and Astronomy


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