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Spatial coherence in strongly scattering media.

Romain Pierrat1, Jean-Jacques Greffet, Rémi Carminati

  • 1Laboratoire d'Energétique Moléculaire et Macroscopique, Combustion, Ecole Centrale Paris, Centre National de la Recherche Scientifique, 92295 Châtenay-Malabry cedex, France.

Journal of the Optical Society of America. A, Optics, Image Science, and Vision
|November 24, 2005
PubMed
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We investigated optical beam coherence in scattering media. The study identified transitions between ballistic and diffusive transport regimes using numerical simulations.

Area of Science:

  • Optics and Photonics
  • Wave Propagation in Disordered Media

Background:

  • Understanding light behavior in scattering media is crucial for applications like optical imaging and sensing.
  • Spatial coherence describes the correlation of light waves across space, impacting beam quality and focusing.

Purpose of the Study:

  • To investigate the spatial coherence of an optical beam within a strongly scattering medium.
  • To analyze the transverse spatial coherence length across different transport regimes (ballistic to diffusive).
  • To identify and characterize the transitions between these regimes in a slab geometry.

Main Methods:

  • Numerical solutions of the radiative transfer equation were employed.
  • The study focused on a slab geometry for confinement of the scattering medium.

Related Experiment Videos

  • Analysis centered on the behavior of the transverse spatial coherence length.

    • Main Results:

    • The study successfully modeled the spatial coherence evolution in a strongly scattering slab.
    • Distinct transitions from ballistic to diffusive transport regimes were numerically identified.
    • The behavior of the transverse spatial coherence length was characterized in each regime.

    Conclusions:

    • The radiative transfer equation provides a robust framework for studying light coherence in scattering media.
    • The identified transitions offer insights into light transport phenomena in disordered materials.
    • This research contributes to a fundamental understanding of wave propagation in complex optical environments.