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    Area of Science:

    • Optics and Photonics
    • Soft Matter Physics
    • Colloid Science

    Background:

    • Diffusing wave spectroscopy (DWS) is a powerful technique for studying colloidal dynamics.
    • Accurate analysis of DWS data relies on precise modeling of light propagation.
    • Light absorption in turbid media can introduce errors in DWS measurements.

    Purpose of the Study:

    • To develop a theoretical framework for DWS that incorporates the effects of light absorption.
    • To derive an accurate expression for the light intensity autocorrelation function in the presence of absorption.
    • To enable reliable microrheology measurements in absorbing colloidal systems.

    Main Methods:

    • Utilized an absorption-dependent diffusive equation to model light propagation in turbid liquids with embedded microspheres.
    • Derived a corrected time-averaged light intensity autocorrelation function.
    • Validated the theoretical model with experimental data.

    Main Results:

    • The derived autocorrelation function accurately describes time fluctuations of scattered light in the diffusion approximation regime.
    • Demonstrated that neglecting absorption can lead to misinterpretation of colloidal dynamics.
    • Experimental results confirm the validity of the new formulation.

    Conclusions:

    • The proposed method corrects for light absorption effects in DWS.
    • This advancement extends the applicability of DWS to systems previously limited by absorption.
    • Opens new possibilities for microrheology in complex, absorbing media.