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Double anisotropic coherent backscattering of light.

Philipp Krauter, Christian Zoller, Alwin Kienle

    Optics Letters
    |April 14, 2018
    PubMed
    Summary

    Researchers discovered a double anisotropic coherent backscattering cone in elongated structures. This phenomenon, unlike single anisotropic backscattering in liquid crystals, shows changing orientation with angular distance, validated by Fourier transforms and Monte Carlo modeling.

    Area of Science:

    • Optics and Photonics
    • Condensed Matter Physics
    • Materials Science

    Background:

    • Coherent backscattering (CBS) is a well-known optical phenomenon.
    • Anisotropic CBS has been observed in liquid crystals, where elongated structures influence light scattering.
    • Understanding complex scattering phenomena in anisotropic media is crucial for optical applications.

    Purpose of the Study:

    • To investigate and characterize a novel double anisotropic coherent backscattering cone.
    • To explore the behavior of elongated structures in anisotropic media under light scattering.
    • To compare experimental findings with theoretical predictions and computational models.

    Main Methods:

    • Experimental observation of double anisotropic coherent backscattering.

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  • Analysis using two-dimensional Fourier transform of spatially resolved reflectance measurements.
  • Validation through Monte Carlo simulations and comparison with diffusion models.

    • Main Results:

    • Observation of a double anisotropic coherent backscattering cone.
    • Demonstration that the long axis of elongated structures changes orientation with angular distance.
    • Experimental results show good agreement with the reciprocity thesis.
    • Monte Carlo model successfully reproduces experimental findings.

    Conclusions:

    • The study identifies and describes a new optical phenomenon: double anisotropic coherent backscattering.
    • The observed phenomenon differs significantly from single anisotropic CBS in liquid crystals.
    • The findings are consistent with the reciprocity thesis and can be modeled using Monte Carlo simulations, but not diffusion models.