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Nonstationary Intensity Statistics in Diffusive Waves.

Ruitao Wu1, Aristide Dogariu1

  • 1CREOL, The College of Optics and Photonics, University of Central Florida, Orlando, Florida 32816, USA.

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|August 16, 2020
PubMed
Summary
This summary is machine-generated.

Intensity statistics in disordered media are not always stationary, contrary to long-standing beliefs. This study reveals evolving stages in diffusion, challenging previous models of light scattering.

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Area of Science:

  • * Physics, Optics, and Statistical Mechanics.
  • * Focuses on light propagation and scattering in disordered materials.

Background:

  • * Conventional understanding posits stationary intensity statistics with negative exponential decay in the diffusion regime.
  • * This belief is challenged by phenomena in strongly disordered media.

Purpose of the Study:

  • * To demonstrate and model the nonstationary nature of intensity statistics during diffusion in strongly disordered media.
  • * To investigate the interplay between recurrent scattering and near-field coupling.

Main Methods:

  • * Development of a novel statistical model to describe nonstationary intensity statistics.
  • * Experimental verification using systematic studies in the optical regime.

Main Results:

  • * Intensity statistics evolve through distinct stages during diffusion, deviating from stationary assumptions.
  • * The proposed model accurately captures these nonstationary properties.
  • * Experimental results confirm the theoretical predictions.

Conclusions:

  • * Intensity statistics in strongly disordered media are nonstationary, reflecting different diffusion stages.
  • * This phenomenon is analogous to nonequilibrium steady-state diffusion in particulate systems.
  • * The findings necessitate a revision of existing models for light transport in disordered materials.