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    Polarization patterns in spherical particle clusters depend on refractive index and size. Near-field effects significantly influence backscattering polarization, which can be modeled using bisphere scattering.

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    Area of Science:

    • Light scattering and polarization phenomena.
    • Optical properties of particle clusters.
    • Computational electromagnetics and wave propagation.

    Background:

    • Understanding light interaction with particulate matter is crucial in various fields, including atmospheric optics and material science.
    • Previous studies have explored scattering by individual particles and simple aggregates, but complex cluster behavior remains challenging.
    • Polarization characteristics offer sensitive probes into particle size, shape, and arrangement.

    Purpose of the Study:

    • To investigate the systematic patterns in linear and circular polarization ratios for orientation-averaged clusters of spherical particles.
    • To explore the relationship between these polarization patterns and the particles' refractive index and size parameter.
    • To approximate the depolarizing behavior of clusters at backscattering using simplified models and assess the role of near-field effects.

    Main Methods:

    • Calculation of polarization ratios (linear and circular) for clusters of spherical particles.
    • Averaging over multiple orientations to simulate random particle arrangements.
    • Approximation of cluster scattering using second-order scattering of bispheres for backscattering analysis.
    • Analysis of near-field effects on polarization at backscattering.

    Main Results:

    • Systematic patterns were observed in polarization ratios as a function of refractive index and size parameter for particle clusters.
    • The depolarizing behavior of orientation-averaged clusters at backscattering can be effectively approximated by the second-order scattering of bispheres.
    • These observed patterns showed relative invariance with respect to the number of particles in the cluster.
    • The significance of near-field effects for polarization phenomena at backscattering was demonstrated.

    Conclusions:

    • The refractive index and size parameter are key determinants of polarization ratios in spherical particle clusters.
    • A simplified bisphere scattering model accurately captures the backscattering depolarization of orientation-averaged clusters, irrespective of particle count.
    • Near-field interactions play a critical role in shaping polarization characteristics during backscattering from particle clusters.