Colloidal hydrodynamic coupling in concentric optical vortices

K. Ladavac, D. G. Grier

    Research output: Contribution to journalArticlepeer-review


    Optical vortex traps created from helical modes of light can drive fluid-borne colloidal particles in circular trajectories. Concentric circulating rings of particles formed by coaxial optical vortices form a microscopic Couette cell, in which the amount of hydrodynamic drag experienced by the spheres depends on the relative sense of the rings' circulation. Tracking the particles' motions makes possible measurements of the hydrodynamic coupling between the circular particle trains and addresses recently proposed hydrodynamic instabilities for collective colloidal motions on optical vortices.

    Original languageEnglish (US)
    Pages (from-to)548-554
    Number of pages7
    JournalEurophysics Letters
    Issue number4
    StatePublished - May 2005

    ASJC Scopus subject areas

    • General Physics and Astronomy


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