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Related Experiment Videos

Single-layer model for surface roughness.

C K Carniglia1, D G Jensen

  • 1Thin Film Products Group, JDS Uniphase, Santa Rosa, California 95407-7397, USA. ccarniglia@ocli.com

Applied Optics
|June 18, 2002
PubMed
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Optical surface roughness reduces light reflectance and transmittance. Adding absorption to a modeled layer accurately predicts these reductions, aligning with scattering theories.

Area of Science:

  • Optics
  • Surface Science
  • Materials Science

Background:

  • Random surface roughness in optical components causes light scattering.
  • This scattering reduces specular reflectance and transmittance.
  • Existing models struggle to accurately predict transmittance changes due to scatter.

Purpose of the Study:

  • To develop a valid physical model for the effects of surface roughness on optical properties.
  • To investigate the role of absorption in modeling scatter-induced transmittance reduction.
  • To compare model predictions with established scalar scattering theories.

Main Methods:

  • Modeling surface roughness effects using a homogeneous layer with intermediate refractive index.
  • Incorporating a small amount of absorption into the homogeneous layer model.

Related Experiment Videos

  • Comparing the absorbing layer model with scalar scattering theory predictions.

    • Main Results:

    • A homogeneous layer model with intermediate refractive index fails to predict transmittance reduction.
    • Adding absorption to the layer model successfully predicts reductions in both reflectance and transmittance.
    • The absorbing layer model's thickness correlates with the surface's root-mean-square (rms) roughness.

    Conclusions:

    • An absorbing homogeneous layer provides a valid model for scatter effects on optical surface reflectance and transmittance.
    • The model's accuracy is supported by scalar scattering theory.
    • The extinction coefficient (k) of the modeled layer is directly proportional to its thickness.