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    To accurately model particulate samples as discrete random media, particle arrangement is crucial. Simply averaging movements is insufficient; particles must be quasi-randomly arranged for realistic optical scattering simulations.

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    Area of Science:

    • Optics
    • Condensed Matter Physics
    • Computational Physics

    Background:

    • Particulate samples can exhibit complex optical behaviors.
    • Understanding these behaviors is key for applications in various scientific fields.
    • Simulating light scattering from multiparticle systems presents computational challenges.

    Purpose of the Study:

    • To analyze conditions under which rigid particulate samples behave as discrete random media.
    • To investigate the role of particle arrangement and movement on optical scattering.
    • To determine the necessary criteria for accurate simulation of scattering effects.

    Main Methods:

    • Employed the numerically exact superposition T-matrix method.
    • Modeled far-field scattering of rigid multiparticle groups.
    • Simulated both fully ordered and quasi-random particle arrangements.
    • Analyzed fixed and random orientations of particle groups.

    Main Results:

    • Averaging optical observables over the movement of a rigid sample alone is insufficient.
    • Quasi-random arrangement of constituent particles is essential for true discrete random medium behavior.
    • Inaccurate replication of scattering effects, including coherent backscattering, occurs without quasi-random arrangement.

    Conclusions:

    • The quasi-random arrangement of particles is a critical factor, not just sample movement, for simulating discrete random media.
    • Accurate modeling of optical scattering from particulate samples requires careful consideration of particle configuration.
    • This study provides insights into the conditions necessary for realistic simulations of light-matter interactions in disordered systems.