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Scattering And Absorption of Light in Planetary Regoliths
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Multiple scattering by random particulate media: exact 3D results.

Michael I Mishchenko, Li Liu, Daniel W Mackowski

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    This study uses the superposition T-matrix method to simulate electromagnetic scattering in random media. Exact results validate radiative transfer and coherent backscattering theories, even in dense particle distributions.

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    Area of Science:

    • Electromagnetism
    • Wave Propagation
    • Computational Physics

    Background:

    • Understanding electromagnetic scattering in random media is crucial for various applications.
    • Existing theories like radiative transfer and coherent backscattering provide frameworks for analyzing light propagation through complex media.
    • Numerical simulations are essential for validating these theories and exploring scattering phenomena in detail.

    Purpose of the Study:

    • To perform numerically exact computations of electromagnetic scattering by randomly distributed particles.
    • To analyze the impact of particle position randomness and increasing particle density on scattering effects.
    • To validate and substantiate microphysical theories of radiative transfer and coherent backscattering.

    Main Methods:

    • Numerically exact superposition T-matrix method.
    • Extensive computations of electromagnetic scattering.
    • Simulation of 3D volumes with randomly distributed wavelength-sized particles.
    • Analysis of statistically homogeneous discrete random media.

    Main Results:

    • Demonstrated the effect of particle position randomness on scattering.
    • Observed the onset and evolution of multiple-scattering effects with increasing particle number.
    • Substantiated the underlying methodology of radiative transfer and coherent backscattering theories.
    • Showcased significant contributions of multiply scattered light along particle strings, even in dense media.

    Conclusions:

    • The superposition T-matrix method provides accurate simulations for electromagnetic scattering in random media.
    • Results confirm the validity of radiative transfer and coherent backscattering theories.
    • Multiple scattering along particle strings plays a significant role in the total scattered signal, enhancing classical effects.