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Determination of the diffusion constant using phase-sensitive measurements.

I M Vellekoop1, P Lodahl, A Lagendijk

  • 1Complex Photonic Systems, Faculty of Science and Technology, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|August 11, 2005
PubMed
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Researchers used a pulsed-light interferometer to study light diffusion through disordered materials. This method simultaneously measures intensity and phase, confirming the consistency of light diffusion models and phase statistics theory.

Area of Science:

  • Optics and Photonics
  • Condensed Matter Physics
  • Materials Science

Background:

  • Understanding light propagation in disordered media is crucial for applications like optical imaging and sensing.
  • Characterizing the diffusion of light through strongly scattering materials presents significant experimental challenges.
  • Previous studies often focused on intensity measurements, with limited simultaneous phase information.

Purpose of the Study:

  • To simultaneously measure the intensity and phase of light transmitted through a strongly scattering disordered material.
  • To compare independent techniques for measuring the diffusion constant of light.
  • To provide experimental validation for the diffusion model and phase statistics theory in disordered systems.

Main Methods:

Related Experiment Videos

  • Utilized a pulsed-light interferometer for precise measurement of light intensity and phase.
  • Acquired time-resolved intensity, frequency correlations, and statistical phase information from single measurements.
  • Employed and compared multiple independent methods to determine the diffusion constant.

    • Main Results:

    • Successfully obtained simultaneous time-resolved intensity, frequency correlations, and phase statistics.
    • Demonstrated consistency across several independent measurements of the diffusion constant.
    • Provided experimental evidence supporting the validity of the diffusion model for light propagation.

    Conclusions:

    • The pulsed-light interferometer is an effective tool for comprehensive characterization of light transport in disordered materials.
    • Experimental results corroborate the theoretical predictions of phase statistics in diffuse light propagation.
    • The study offers robust experimental validation for the diffusion model in strongly scattering media.