Light scattering by a core-mantle spheroidal particle

Area of Science:

• Electromagnetic theory
• Computational physics
• Optics

Background:

• Electromagnetic scattering from complex particles is crucial in various scientific fields.
• Spheroidal particles are common in atmospheric and biological systems.
• Existing models often simplify particle composition or geometry.

Purpose of the Study:

• To develop a robust analytical solution for electromagnetic scattering by confocal coated spheroids.
• To investigate the influence of core properties and particle shape on scattering efficiency.
• To provide a versatile method applicable to diverse material compositions and sizes.

Main Methods:

• Utilized the method of separation of variables in a spheroidal coordinate system.
• Decomposed radiation fields into axisymmetric and non-axisymmetric components for separate analysis.
• Employed Abraham's potentials and a superposition of sphere/cylinder potentials for scalar potentials.

Main Results:

• Developed a general solution for light scattering from confocal coated spheroids with arbitrary parameters.
• Calculated efficiency factors for prolate and oblate spheroids with varying refractive indices and absorption.
• Observed similarities between coated and homogeneous spheroids' efficiency factors when volume-averaged.

Conclusions:

• The proposed method effectively solves the electromagnetic scattering problem for complex coated spheroids.
• Particle shape, core size, and absorption significantly alter scattering characteristics.
• The findings contribute to a better understanding of light-matter interactions in complex systems.