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Scattering from rough thin films: discrete-dipole-approximation simulations.

Hannu Parviainen1, Kari Lumme

  • 1Observatory, Tähtitorninmäki, 00014 University of Helsinki, Finland. hannu@astro.helsinki.fi

Journal of the Optical Society of America. A, Optics, Image Science, and Vision
|December 25, 2007
PubMed
Summary

We studied light scattering from rough thin films using the discrete-dipole approximation. Results show this method accurately models scattering from inhomogeneous materials, matching analytical approximations.

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Area of Science:

  • Optics and Photonics
  • Materials Science

Background:

  • Thin films are crucial in optical devices.
  • Understanding light scattering from their surfaces is essential for performance.
  • Surface roughness and internal inhomogeneity significantly impact optical properties.

Purpose of the Study:

  • To investigate the wave-optical light scattering properties of deformed thin circular films.
  • To evaluate the discrete-dipole approximation (DDA) for modeling scattering from rough surfaces.
  • To analyze the influence of statistical roughness and material inhomogeneity on scattered light intensity.

Main Methods:

  • Utilized the discrete-dipole approximation (DDA) for wave-optical light scattering calculations.
  • Modeled thin films as computationally feasible rough-surface analogs.
  • Investigated various statistical roughness models and parameters.
  • Studied the effects of random, small-scale porosity in the film medium.

Main Results:

  • The DDA is suitable for analyzing scattering from rough thin films.
  • Different roughness models and parameters significantly alter scattered light intensity distributions.
  • Small-scale porosity within the film affects light scattering patterns.
  • DDA results for inhomogeneous media align well with the Maxwell Garnett approximation.

Conclusions:

  • The discrete-dipole approximation is a viable computational tool for studying light scattering from rough and inhomogeneous thin films.
  • Accurate modeling requires careful consideration of surface roughness statistics and material inhomogeneity.
  • The findings validate DDA's utility in predicting optical behavior of complex thin film structures.