Multiple scattering of light in discrete random media using incoherent interactions

Area of Science:

• Optics and Photonics
• Computational Physics
• Materials Science

Background:

• Light scattering in discrete random media is crucial for understanding phenomena like atmospheric optics and material properties.
• Accurate modeling of densely packed particles presents significant computational challenges.

Purpose of the Study:

• To introduce and validate a novel numerical method, radiative transfer with reciprocal transactions (R2T2), for light scattering in discrete random media.
• To accurately compute scattering and absorption characteristics of densely packed spherical particles.

Main Methods:

• Developed the radiative transfer with reciprocal transactions (R2T2) framework.
• Utilized the superposition T-Matrix method (STMM) to derive volume element scattering properties.
• Employed an order-of-scattering Monte Carlo approach to simulate interactions between volume elements.
• Computed direct and reciprocal contributions to analyze coherent backscattering effects.

Main Results:

• The R2T2 method successfully computes frequency-domain incoherent volume-element scattering characteristics.
• Numerical simulations demonstrated agreement between R2T2 and exact STMM solutions for large, densely packed particle systems.
• Coherent backscattering effects were accurately evaluated through the analysis of reciprocal contributions.

Conclusions:

• The R2T2 method provides a computationally viable and accurate approach for simulating light scattering in dense random media.
• This method is suitable for modeling asymptotically infinite systems of particles, advancing the field of radiative transfer.
• The findings validate R2T2 as a powerful tool for scientific research and applications involving light-matter interactions in complex media.