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Light scattering by randomly oriented bispheres.

M I Mishchenko, D W Mackowski

    Optics Letters
    |October 27, 2009
    PubMed
    Summary

    We used the T-matrix method to calculate light scattering by randomly oriented bispheres. Bispheres showed enhanced depolarization compared to spheroids due to cooperative scattering effects.

    Area of Science:

    • Electromagnetic scattering
    • Optical properties of particles
    • Computational physics

    Background:

    • Understanding light scattering by non-spherical particles is crucial in various fields.
    • Previous studies often simplified particle shapes, limiting accuracy.
    • Bispheres offer a more complex yet realistic model for certain particle aggregates.

    Purpose of the Study:

    • To analytically compute the Stokes scattering matrix for randomly oriented bispheres using the T-matrix approach.
    • To compare the scattering properties of bispheres with those of spheroids and spheres.
    • To investigate the role of cooperative scattering in the depolarization capabilities of bispheres.

    Main Methods:

    • Analytical computation of the Stokes scattering matrix.

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  • Application of the T-matrix method.
  • Modeling randomly oriented bispheres (touching and separated components).
  • Comparison with volume-equivalent prolate spheroids and spheres.

    • Main Results:

    • The T-matrix approach successfully computed the Stokes scattering matrix for bispheres.
    • Bispheres with touching components exhibited more efficient depolarization than spheroids in the back-scattering direction.
    • Cooperative (multiple-scattering) effects were identified as the cause for enhanced depolarization in bispheres.

    Conclusions:

    • The T-matrix method is effective for studying light scattering by complex particle shapes like bispheres.
    • Bispheres can be more significant depolarizers than simpler shapes under certain conditions.
    • Cooperative scattering plays a key role in the optical properties of particle aggregates.