Transient radiative transfer in a scattering slab considering polarization

Area of Science:

• Optics
• Photonics
• Computational Physics

Background:

• Accurate simulation of short-pulse laser propagation in scattering media requires considering both transient and polarization characteristics.
• Existing models often simplify these complex interactions, limiting their applicability in scenarios demanding high fidelity.

Purpose of the Study:

• To develop a robust Monte Carlo (MC) model for simulating transient vector radiative transfer of short-pulse lasers in scattering media.
• To define a transient vector radiative transfer matrix (TVRTM) for characterizing polarization behavior.
• To introduce a new reflection criterion for Fresnel surfaces.

Main Methods:

• A Monte Carlo method was enhanced with a time shift and superposition principle to simulate transient vector radiative transfer.
• The transient vector radiative transfer matrix (TVRTM) was defined to describe polarization dynamics.
• A novel reflection criterion for Fresnel surfaces was developed based on reflectivity definitions.

Main Results:

• The model's accuracy was validated by comparing results for transient scalar and steady-state vector radiative transfer with existing literature, showing excellent agreement.
• The simulation successfully incorporated polarization effects, providing distributions of the Stokes vector in angular and temporal domains.
• A new criterion for Fresnel surface reflection was presented.

Conclusions:

• The developed MC model accurately simulates transient vector radiative transfer of short-pulse lasers in scattering media, including polarization effects.
• The TVRTM provides a valuable tool for analyzing transient polarization behavior.
• The study enhances the understanding and simulation capabilities for light propagation in complex media.