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The Diffusion of Passive Tracers in Laminar Shear Flow
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Detection of a diffusive cloak via second-order statistics.

Milan Koirala, Alexey Yamilov

    Optics Letters
    |August 13, 2016
    PubMed
    Summary

    We developed a method to detect diffusive cloaks by analyzing light intensity correlations, revealing their size, position, and depth. This technique leverages wave interference effects missed by diffusion approximations.

    Area of Science:

    • Optics
    • Wave Phenomena
    • Materials Science

    Background:

    • Diffusive cloaks, proposed by Schittny et al., aim to control light diffusion.
    • Standard diffusion approximations for light propagation in turbid media neglect wave interference.
    • Detecting such cloaks requires methods sensitive to interference effects.

    Purpose of the Study:

    • To propose and validate a scheme for detecting diffusive cloaks.
    • To exploit wave interference phenomena for cloak characterization.
    • To demonstrate manipulation of wave propagation statistics in turbid media.

    Main Methods:

    • Analysis of long-range contributions to intensity correlations.
    • Exploiting sensitivity to path crossings and intra-medium interference.

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  • Investigating separate manipulation of first- and second-order statistics.

    • Main Results:

    • Successfully demonstrated a method to detect diffusive cloaks.
    • Determined the size, position, and depth of the diffusive cloak.
    • Showed the potential to independently control different statistical orders of wave propagation.

    Conclusions:

    • Wave interference is crucial for detecting diffusive cloaks.
    • Intensity correlation analysis provides a viable detection mechanism.
    • Advanced control over wave propagation statistics in turbid media is achievable.