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Backscattering measurements from double-scale randomly rough surfaces.

Víctor Ruiz-Cortés1, Christopher Dainty

  • 1Depto. de Óptica, División de Física Aplicada, Centro de Investigación Científica y de Educación Superior de Ensenada, Ensenada, B.C., Mexico. vruizc@cicese.mx

Journal of the Optical Society of America. A, Optics, Image Science, and Vision
|June 8, 2012
PubMed
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Light backscattered from oceanlike surfaces depolarizes significantly at small incidence angles. Shadowing effects become prominent for large incidence angles, impacting optical measurements.

Area of Science:

  • Optics and Photonics
  • Surface Science
  • Electromagnetism

Background:

  • Understanding light scattering from rough surfaces is crucial in optics.
  • Ocean surfaces exhibit complex roughness at multiple scales.

Purpose of the Study:

  • To experimentally measure light backscattered from double-scale rough surfaces.
  • To analyze the impact of surface statistical parameters and incidence angles on backscattered light polarization and shadowing.

Main Methods:

  • Fabrication of double-scale rough surfaces (sinusoidal or Stokes wave profiles) with superimposed small-scale roughness.
  • Gold coating of surfaces.
  • Experimental measurement of backscattered light from linearly polarized incident beams at various incidence angles.

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Main Results:

  • Strong depolarization of backscattered light observed, particularly at small incidence angles.
  • Significant shadowing effects noted for large incidence angles (greater than 60°).
  • Depolarization is dependent on the surface statistical parameters.

Conclusions:

  • Double-scale roughness significantly influences light backscattering properties.
  • Incidence angle is a critical factor determining depolarization and shadowing in light scattering from complex surfaces.