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Modal analysis in 2D media with variable disorder.

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    Optics Express
    |April 4, 2015
    PubMed
    Summary

    This study numerically analyzed 2D disordered optical structures in the Mid-IR region. Results highlight localized regime transitions and light diffusion, proposing a new measure for randomness.

    Area of Science:

    • Optics and Photonics
    • Condensed Matter Physics
    • Computational Materials Science

    Background:

    • Understanding modal properties of disordered optical structures is crucial for developing advanced photonic devices.
    • Mid-infrared (Mid-IR) applications require precise control over light propagation in complex media.
    • Previous studies often lacked detailed statistical analysis of disorder effects on optical modes.

    Purpose of the Study:

    • To numerically analyze the modal properties of 2D disordered optical structures in the Mid-IR.
    • To investigate the transition to the localized regime and its impact on the quality factor.
    • To explore light diffusion mechanisms and propose a novel measure for randomness.

    Main Methods:

    • Finite Element Method (FEM) for detailed modal property analysis.

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  • Monte Carlo Method for simulating light diffusion and statistical interpretation.
  • Development and application of an alternative measure for quantifying randomness weight.

    • Main Results:

    • Identified key parameters influencing modal properties, including scattering amount and disorder level.
    • Demonstrated a clear transition to the localized regime and its correlation with the quality factor.
    • Statistical analysis revealed insights into light diffusion dynamics within disordered structures.

    Conclusions:

    • Numerical simulations provide a robust framework for understanding optical behavior in disordered systems.
    • The proposed randomness measure effectively supports the interpretation of numerical results.
    • Findings contribute to the design of Mid-IR optical devices with tailored light-matter interactions.