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Coherent backscattering spectroscopy.

Young L Kim1, Yang Liu, Vladimir M Turzhitsky

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

Optics Letters
|September 11, 2004
PubMed
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This study introduces a new method for measuring coherent backscattering (CBS) using low coherence light, enabling observations in biological tissues. This technique also allows for the first spectroscopic analysis of CBS, crucial for depth-selective measurements.

Area of Science:

  • Optics and Photonics
  • Biomedical Optics
  • Condensed Matter Physics

Background:

  • Coherent backscattering (CBS) is typically studied using coherent light sources.
  • Conventional CBS measurements are limited in complex media like biological tissues.
  • Previous methods lacked the ability for spectroscopic analysis of CBS.

Purpose of the Study:

  • To develop a novel method for CBS measurement applicable to a wider range of media.
  • To demonstrate the feasibility of spectroscopic analysis of CBS.
  • To overcome limitations of conventional CBS techniques in scattering media.

Main Methods:

  • Utilized low spatial coherence, broadband illumination, and spectrally resolved detection for CBS measurement.
  • Employed low temporal coherence detection to further reduce speckle.

Related Experiment Videos

  • Applied the novel method to biological tissue and other scattering media.

    • Main Results:

    • Achieved an anomalously broad CBS peak with low spatial coherence illumination.
    • Demonstrated dramatic speckle reduction, facilitated by low temporal coherence detection.
    • Successfully performed the first spectroscopic analysis of CBS.

    Conclusions:

    • The novel CBS measurement technique expands the applicability of CBS to biological tissues.
    • Spectroscopic analysis of CBS offers new possibilities for probing random media.
    • This method is crucial for depth-selective measurements in complex scattering environments.