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Localization-induced coherent backscattering effect in wave dynamics.

H Schomerus1, K J van Bemmel, C W Beenakker

  • 1Instituut-Lorentz, Universiteit Leiden, P.O. Box 9506, 2300 RA Leiden, The Netherlands.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|April 20, 2001
PubMed
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We studied wave reflection in disordered waveguides, finding that wave localization significantly alters delay time statistics. Coherent backscattering enhances short delay times near normal incidence, an effect absent in diffusive systems.

Area of Science:

  • Physics
  • Wave Phenomena
  • Condensed Matter Physics

Background:

  • Wave propagation in disordered systems is complex.
  • Wave localization can alter wave transport properties.
  • Diffusive and localized regimes exhibit distinct wave dynamics.

Purpose of the Study:

  • Investigate single-mode delay time statistics in disordered waveguides.
  • Analyze the impact of wave localization on wave reflection.
  • Compare delay time distributions in localized versus diffusive regimes.

Main Methods:

  • Theoretical analysis of wave reflection.
  • Statistical analysis of single-mode delay times.
  • Examination of coherent backscattering effects.

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Main Results:

  • Delay time distributions differ qualitatively between localized and diffusive regimes.
  • Coherent backscattering enhances the probability of small delay times by approximately sqrt[2] near normal incidence.
  • This dynamic effect is absent in the diffusive regime.

Conclusions:

  • Wave localization fundamentally changes wave reflection delay time statistics.
  • Coherent backscattering is a key factor influencing delay times in localized systems.
  • Understanding these statistics is crucial for controlling wave transport in disordered media.