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Coherence of light scattered from a randomly rough surface.

T A Leskova1, A A Maradudin, J Munõz-Lopez

  • 1Department of Physics and Astronomy, University of California, Irvine, 92697, USA.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|May 21, 2005
PubMed
Summary

We investigated light coherence scattered from rough metal surfaces. Spatial coherence depends on distance, mimicking surface properties and showing oscillations due to lateral waves and enhanced backscattering.

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Area of Science:

  • Optics and Photonics
  • Condensed Matter Physics
  • Surface Science

Background:

  • Understanding light scattering from surfaces is crucial for optical applications.
  • The coherence properties of scattered light reveal information about surface characteristics and electromagnetic phenomena.

Purpose of the Study:

  • To analyze the spatial coherence of p-polarized light scattered from a 1D weakly rough random metal surface.
  • To investigate the influence of distance from the surface and scattering processes on coherence.

Main Methods:

  • Calculation of the mutual coherence function for the scattered magnetic field.
  • Analysis in planes parallel to the mean scattering surface at varying distances.
  • Examination of spatial coherence in both near-field and far-field regions.

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Main Results:

  • Coherence function comprises distance-independent and distance-dependent terms.
  • Far-field spatial coherence mimics surface autocorrelation and exhibits oscillations related to lateral waves and enhanced backscattering.
  • Near-field coherence shows oscillations due to surface plasmon polaritons.

Conclusions:

  • The study elucidates the complex nature of light coherence scattered from rough metal surfaces.
  • Observed phenomena like lateral waves, enhanced backscattering, and surface plasmon polaritons significantly impact coherence.
  • Findings contribute to the understanding of light-surface interactions and nanoscale optical phenomena.