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    Area of Science:

    • Electromagnetics and Optics
    • Computational Physics

    Background:

    • Arbitrary geometric scatterers in natural environments significantly impact optical-band antenna systems when their dimensions approach the wavelength.
    • Distinct beam types (Gaussian, Bessel, Airy) interact uniquely with complex scatterer geometries, necessitating a versatile scattering analysis framework.

    Purpose of the Study:

    • To extend the DDSCAT code to support externally defined structured beams for scattering and absorption simulations.
    • To enable analysis of arbitrary beam-particle combinations in complex optical environments.

    Main Methods:

    • Extension of the DDSCAT (Discrete Dipole Approximation Code) to incorporate user-defined structured beams.
    • Simulation of scattering and absorption for arbitrary particles illuminated by various beam types.

    Main Results:

    • The extended DDSCAT model demonstrated good agreement with Generalized Lorenz-Mie theory for spherical particles.
    • Validation against COMSOL Multiphysics confirmed accuracy for irregular particle simulations.
    • Successful simulation of scattering and absorption for arbitrary beam-particle combinations.

    Conclusions:

    • The enhanced DDSCAT provides a general and flexible framework for analyzing light-matter interactions with complex scatterers and structured beams.
    • This tool is valuable for electromagnetic compatibility, channel characterization, and optical antenna design.