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Studying Soft-matter and Biological Systems over a Wide Length-scale from Nanometer and Micrometer Sizes at the Small-angle Neutron Diffractometer KWS-2
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Coherent backscattering cone shape depends on the beam size.

Renzhe Bi1, Jing Dong, Kijoon Lee

  • 1Division of Bioengineering, School of Chemical and Biomedical Engineering, Nanyang Technological University, Singapore.

Applied Optics
|September 13, 2012
PubMed
Summary

Finite beam size distorts coherent backscattering (CBS) cone shape, impacting optical property measurements. This study quantifies the effect, revealing submillimeter beam sizes cause significant distortion, crucial for biological tissue characterization.

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Area of Science:

  • Optics and Photonics
  • Biomedical Optics
  • Condensed Matter Physics

Background:

  • Coherent backscattering (CBS) is a wave phenomenon in disordered media with applications in optical property measurement.
  • Existing models for the CBS cone shape assume an infinitely large incident light beam, which is often not practical.
  • Understanding deviations from ideal models is crucial for accurate interpretation of experimental CBS data.

Purpose of the Study:

  • To investigate the theoretical and experimental effects of finite laser beam diameter on the coherent backscattering (CBS) cone shape.
  • To establish a quantitative relationship between incident beam size and CBS cone distortion.
  • To assess the implications of these findings for optical property measurements, particularly in biological tissues.

Main Methods:

  • Developed two theoretical models (uniform top hat and Gaussian distribution) to describe CBS with finite beam illumination.
  • Conducted experiments varying the incident laser beam diameter to collect CBS data.
  • Compared experimental results with theoretical predictions to validate the models.

Main Results:

  • Established a quantitative relationship between finite laser beam size and CBS cone shape.
  • Observed significant distortion of the CBS cone when the beam diameter becomes submillimeter.
  • Demonstrated that the assumption of an infinitely large beam is invalid for smaller beam sizes.

Conclusions:

  • The finite size of the incident light beam significantly affects the coherent backscattering cone shape.
  • Submillimeter beam sizes introduce distortions that must be accounted for in optical measurements.
  • Small beam CBS may offer advantages for high-resolution characterization of biological tissues where conventional CBS cones are too narrow.