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Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping
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Wavefront shaping through a free-form scattering object.

Alfredo Rates, Ad Lagendijk, Aurèle J L Adam

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    Wavefront shaping controls light in scattering materials. This study shows it works well for free-form shapes, not just slabs, with potential for industrial applications.

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    Area of Science:

    • Optics and Photonics
    • Materials Science

    Background:

    • Wavefront shaping (WFS) is a powerful technique for controlling light propagation in scattering media.
    • Previous studies primarily focused on simple geometries like slabs and waveguides, limiting understanding of WFS applicability to complex shapes.

    Purpose of the Study:

    • To investigate the impact of macroscopic sample shape on light scattering control using WFS.
    • To assess the performance of WFS across different sample geometries, including free-form shapes.

    Main Methods:

    • Utilized a flexible scattering material and WFS to optimize light intensity at a focal spot.
    • Recorded optimized patterns and compared light enhancement across varying sample curvatures and beam radii.
    • Developed a novel figure of merit to quantitatively evaluate WFS performance for diverse shapes.

    Main Results:

    • WFS demonstrated effective light focusing and enhancement across different macroscopic sample shapes.
    • The enhancement achieved by WFS was found to be largely independent of the sample's geometric complexity.
    • Surprisingly, the free-form shape exhibited slightly superior WFS performance compared to the slab geometry for the tested material.

    Conclusions:

    • WFS is a versatile technique applicable to complex, non-planar scattering media.
    • The findings suggest broad potential for WFS in industrial applications involving intricate material geometries.
    • The study introduces a new metric for evaluating WFS performance and highlights the unexpected efficacy of WFS in free-form scattering samples.