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    Area of Science:

    • Optics
    • Materials Science
    • Electromagnetism

    Background:

    • Ideal diffusive-light invisibility cloaks render objects indistinguishable from surroundings for visible light across all colors, polarizations, and directions.
    • The diffusion equation for light is an approximation valid for small coherence lengths.

    Purpose of the Study:

    • To investigate the robustness of diffusive-light invisibility cloaks under varying light coherence.
    • To determine if cloaks can be revealed by coherent or partially coherent light.

    Main Methods:

    • Experimental analysis of cylindrical core-shell cloaks.
    • Theoretical modeling based on the diffusion equation for light.
    • Illumination with partially coherent light to observe speckle patterns.

    Main Results:

    • Diffusive-light invisibility cloaks demonstrate robustness in the limit of large coherence length.
    • Analysis of speckle patterns under partially coherent light reveals the cloaked objects.
    • Experimental findings align well with theoretical predictions.

    Conclusions:

    • While effective for incoherent light, diffusive-light invisibility cloaks are not universally effective against all light conditions.
    • Speckle pattern analysis under partially coherent light provides a method to detect objects within these cloaks.
    • The limitations of the diffusion equation approximation highlight the importance of light coherence in cloaking effectiveness.