Sorting colloidal particles into multiple channels with optical forces: Prismatic optical fractionation

Ke Xiao, David G. Grier

    Research output: Contribution to journalArticle

    Abstract

    Brownian particles drifting through a periodically structured force landscape can become entrained by the landscape's symmetries. What direction a particular particle takes can depend strongly on subtle variations in its physical properties. Consequently, a homogeneously structured force field can sort a mixture of particles into spatially separated fractions, much as an optical prism refracts light into its component wavelengths. When the force landscape is implemented with structured light fields, such continuous multichannel sorting may be termed prismatic optical fractionation. We describe experimental and numerical studies of colloidal spheres' transport through periodic arrays of optical tweezers, which reveal an important role for three-dimensional motion in determining a drifting particle's fate. These studies also demonstrate sorting on the basis of statistically locked-in transport, in which Brownian fluctuations contribute to direction selection.

    Original languageEnglish (US)
    Article number051407
    JournalPhysical Review E
    Volume82
    Issue number5
    DOIs
    StatePublished - Nov 30 2010

    Fingerprint

    Optical Forces
    classifying
    Sorting
    fractionation
    three dimensional motion
    Structured Light
    Optical Tweezers
    Prism
    Force Field
    Physical property
    Sort
    field theory (physics)
    prisms
    Numerical Study
    Experimental Study
    physical properties
    Wavelength
    Fluctuations
    Symmetry
    Three-dimensional

    ASJC Scopus subject areas

    • Condensed Matter Physics
    • Statistical and Nonlinear Physics
    • Statistics and Probability

    Cite this

    Sorting colloidal particles into multiple channels with optical forces : Prismatic optical fractionation. / Xiao, Ke; Grier, David G.

    In: Physical Review E, Vol. 82, No. 5, 051407, 30.11.2010.

    Research output: Contribution to journalArticle

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