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Path sampling and integration method to calculate speckle patterns.

Chunyuan Song, Jingjing Gao, Yu Gan

    Optics Express
    |May 9, 2023
    PubMed
    Summary

    Researchers developed a novel simulation method for calculating optical speckle patterns in scattering media. This path sampling technique accurately predicts complex light interactions for advanced material analysis and non-invasive diagnostics.

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    Area of Science:

    • Optics
    • Condensed Matter Physics
    • Computational Physics

    Background:

    • Stable optical speckle patterns arise from coherent light interacting with stationary scattering media.
    • Existing methods are insufficient for calculating speckle patterns in macro media with numerous scatterers.

    Purpose of the Study:

    • To present a new simulation method for calculating optical field propagation and speckle patterns in scattering media.
    • To enable accurate simulation of light interaction with complex scattering environments.

    Main Methods:

    • A novel method based on possible path sampling with weights and coherent superposition.
    • Simulating photon propagation through a medium with fixed scatterers, updating direction upon collision.
    • Forming speckle patterns via coherent superposition of sampled photon path lengths.

    Main Results:

    • The method successfully simulates optical field propagation and generates output speckle patterns.
    • Demonstrates the feasibility of calculating speckle patterns for macro media with many scatterers.

    Conclusions:

    • The presented path sampling method offers a valid approach for simulating speckle patterns in scattering media.
    • This technique can advance studies on medium parameters, scatterer motion, and sample distortions.
    • It holds potential for micro-examination of optical fields and inspires new non-invasive diagnostic techniques.