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Multiple-scattering suppression by cross correlation.

W V Meyer, D S Cannell, A E Smart

    Applied Optics
    |February 12, 2008
    PubMed
    Summary
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    This study introduces a novel method for particle characterization in turbid media using cross-correlation of scattered light. This technique extends dynamic light scattering to opaque samples by distinguishing single from multiple scattering.

    Area of Science:

    • Physics
    • Optical Science
    • Materials Science

    Background:

    • Characterizing particles in turbid media is challenging due to excessive light scattering.
    • Traditional dynamic light scattering (DLS) is limited to optically transparent samples.
    • Multiple scattering obscures single-scattering information, hindering accurate particle size analysis.

    Purpose of the Study:

    • To develop a new method for particle characterization in highly turbid media.
    • To extend the capabilities of dynamic light scattering to visually opaque samples.
    • To differentiate between single and multiple scattering events for improved analysis.

    Main Methods:

    • Utilizing cross-correlation of scattered intensity fluctuations at two nearby points in the far field.

    Related Experiment Videos

  • Exploiting the physical size difference between single-scattering and multiple-scattering speckle patterns.
  • Optimizing optical geometry to select specific scattering wave vectors and minimize multiple scattering contributions.

    • Main Results:

    • The developed cross-correlation method effectively emphasizes single scattering.
    • The technique successfully extends particle size characterization to turbid and opaque samples.
    • Experimental validation demonstrates the feasibility and efficacy of the proposed approach.

    Conclusions:

    • The novel cross-correlation method provides a robust way to characterize particles in turbid media.
    • This technique overcomes limitations of traditional DLS for opaque samples.
    • The findings open new avenues for analyzing complex scattering systems.