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Using dynamic low-coherence interferometry to image Brownian motion within highly scattering media.

D A Boas, K K Bizheva, A M Siegel

    Optics Letters
    |December 18, 2007
    PubMed
    Summary
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    Dynamic low-coherence interferometry accurately measures Brownian motion in highly scattering media. This technique enables particle characterization in concentrated suspensions, revealing spatial diffusion variations.

    Area of Science:

    • Biophysics
    • Optical Physics
    • Materials Science

    Background:

    • Measuring Brownian motion in highly scattering media is challenging due to light multiple scattering.
    • Traditional particle characterization methods are limited to optically dilute suspensions.
    • Understanding particle dynamics in concentrated suspensions is crucial for various applications.

    Purpose of the Study:

    • To develop and validate a method for measuring Brownian motion in highly scattering media.
    • To apply particle characterization techniques to optically concentrated suspensions.
    • To image spatial variations of the Brownian diffusion coefficient.

    Main Methods:

    • Dynamic low-coherence interferometry combined with a confocal microscope.
    • Utilized a coherence gate for strong rejection of multiply scattered light.

    Related Experiment Videos

  • Measured Brownian diffusion coefficient and power spectrum broadening.

    • Main Results:

    • Successfully measured Brownian motion of submicrometer particles in highly scattering media.
    • Determined the Brownian diffusion coefficient with accuracy better than 5%.
    • Imaged spatial variations in the Brownian diffusion coefficient with ~30 mum axial resolution.
    • Observed power spectrum broadening with increasing sample depth.

    Conclusions:

    • Dynamic low-coherence interferometry is effective for studying particle dynamics in concentrated suspensions.
    • The technique allows particle characterization previously limited to dilute systems.
    • Spatial mapping of diffusion coefficients provides new insights into complex media.