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Related Experiment Videos

Origin of low-coherence enhanced backscattering.

Young L Kim1, Prabhakar Pradhan, Hariharan Subramanian

  • 1Biomedical Engineering Department, Northwestern University, Evanston, Illinois 60208, USA. younglae@northwestern.edu

Optics Letters
|April 28, 2006
PubMed
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Low-coherence enhanced backscattering (EBS) in random media originates from double scattering events. This study reveals that low spatial coherence light isolates these crucial double scattering paths, providing experimental evidence for a long-standing hypothesis in EBS research.

Area of Science:

  • Optics and Photonics
  • Condensed Matter Physics
  • Wave Phenomena

Background:

  • Enhanced backscattering (EBS) of light in random media is a well-known phenomenon.
  • The origin of low-coherence EBS, where illumination coherence is less than the transport mean free path, remained poorly understood.
  • Previous hypotheses suggested a minimal number of scattering events contribute to EBS.

Purpose of the Study:

  • To elucidate the origin of low-coherence enhanced backscattering (EBS) in random media.
  • To investigate the role of spatial coherence in EBS.
  • To provide experimental evidence for the minimal number of scattering events in EBS.

Main Methods:

  • Utilized weakly scattering discrete random media.
  • Employed low-coherence illumination.

Related Experiment Videos

  • Analyzed time-reversed paths of light scattering.
  • Performed experimental measurements to validate theoretical predictions.

    • Main Results:

    • Demonstrated that low-coherence EBS originates from time-reversed paths of double scattering.
    • Showed that low spatial coherence dephases waves outside the coherence area, isolating double scattering.
    • Presented the first experimental evidence confirming double scattering as the minimal event in EBS.

    Conclusions:

    • The study clarifies the fundamental mechanism behind low-coherence EBS.
    • Confirms that double scattering is the minimal scattering event responsible for EBS.
    • Highlights the critical role of spatial coherence in controlling and understanding EBS phenomena.