Dynamic light scattering in subdiffusive regimes

    Authors

    G. Popescu;A. Dogariu

    Abbreviated Journal Title

    Appl. Optics

    Keywords

    DIFFUSING-WAVE-SPECTROSCOPY; RANDOM-MEDIA; PHOTON TRANSPORT; REFLECTION; LIMIT; Optics

    Abstract

    For describing the fluctuating signal scattered from a multiple-scattering system, diffusive-wave spectroscopy makes use of a diffusion model that provides the path-length distribution of scattered waves for a specific geometry. Using the recently introduced optical path-length spectroscopy, we show that the diffusion model fails to describe wave propagation in the low-order multiple-scattering regime. We propose a new methodology with which to obtain information about the dynamic properties of nondiffusive scattering systems. We use optical path-length spectroscopy to obtain experimentally the pathlength distribution of optical waves scattered from dynamic colloids, which are multiply scattering but not in the diffusion limit. The experimental results show that, with this new technique, the accuracy of dynamic measurements is significantly improved in subdiffusive scattering regimes. (C) 2001 Optical Society of America.

    Journal Title

    Applied Optics

    Volume

    40

    Issue/Number

    24

    Publication Date

    1-1-2001

    Document Type

    Article

    Language

    English

    First Page

    4215

    Last Page

    4221

    WOS Identifier

    WOS:000170543300029

    ISSN

    1559-128X

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