Anomalous vibrational dispersion in holographically trapped colloidal arrays

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

    Research output: Contribution to journalArticle

    Abstract

    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
    Volume96
    Issue number8
    DOIs
    StatePublished - 2006

    ASJC Scopus subject areas

    • Physics and Astronomy(all)

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