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Low-coherence enhanced backscattering beyond diffusion.

Min Xu1

  • 1Department of Physics, Fairfield University, Fairfield, CT 06824, USA. mxu@mail.fairfield.edu

Optics Letters
|June 3, 2008
PubMed
Summary
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This study presents a new theory for coherent backscattering (CBS) of low-coherence light. The theory links CBS profiles to light scattering properties and is validated by simulations for enhanced backscattered light.

Area of Science:

  • Optics
  • Condensed Matter Physics
  • Photonics

Background:

  • Coherent backscattering (CBS) is a wave phenomenon observed in disordered media.
  • Understanding CBS is crucial for applications in light scattering and imaging.
  • Previous theories often simplified incident light properties, limiting applicability.

Purpose of the Study:

  • To develop an analytical theory for coherent backscattering (CBS) of low-coherence light.
  • To establish a link between the CBS profile and the radial distribution of incoherent backscattered light.
  • To analyze the influence of partial spatial coherence on CBS.

Main Methods:

  • Derivation of an analytical expression for the CBS profile.
  • Inclusion of 'snake light' (light undergoing exactly two large-angle scatterings) in the analysis.

Related Experiment Videos

  • Validation using Monte Carlo simulations.

    • Main Results:

    • The model accurately describes the CBS profile when incident beam coherence length exceeds the scattering mean free path.
    • Intensity of enhanced backscattered light is proportional to spatial coherence length (L(c)) for small L(c).
    • Width of the CBS cone is inversely proportional to spatial coherence length (L(c)) for small L(c).

    Conclusions:

    • The developed analytical theory provides a robust framework for understanding CBS with low-coherence and partially coherent light.
    • The findings offer insights into the relationship between light coherence and scattering phenomena.
    • This work has implications for optical sensing and characterization of scattering media.