FDTD-based Monte Carlo method for the simulation of optical transport in complex scattering media

Area of Science:

• Optics and Photonics
• Computational Physics
• Materials Science

Background:

• Studying light transport in scattering media with complex particle shapes is challenging.
• Conventional Monte Carlo methods using Mie scattering are limited for anisotropic media and complex particle shapes, especially regarding depolarization.

Purpose of the Study:

• To propose a novel Monte Carlo simulation approach combined with finite-difference time-domain (FDTD) for modeling light transmission in complex scattering media.
• To accurately simulate light intensity and polarization, including depolarization characteristics, in media with asymmetric, polydisperse particles.

Main Methods:

• Developed a hybrid Monte Carlo and finite-difference time-domain (FDTD) simulation.
• Modeled light field transmission (intensity and polarization) through complex scattering media.
• Used an oil smoke scattering model for validation.

Main Results:

• The simulation accurately models light intensity and polarization transmission.
• The method effectively simulates depolarization characteristics in complex scattering media.
• Simulation results for oil smoke closely matched experimental measurements.

Conclusions:

• The proposed Monte Carlo-FDTD method is effective for simulating light field characteristics in complex scattering media.
• This approach overcomes limitations of conventional methods relying on spherical particle assumptions.
• The findings are crucial for understanding optical transport in diverse natural and engineered scattering environments.