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    Area of Science:

    • Optics and Photonics
    • Materials Science

    Background:

    • Efficient light beam redirection is crucial for various optical systems.
    • Traditional coupling gratings often face limitations in achieving high diffraction efficiencies.

    Purpose of the Study:

    • To describe a novel class of coupling gratings for efficient light beam redirection.
    • To investigate the performance of symmetric binary gratings with asymmetric high refractive index coatings.

    Main Methods:

    • Fabrication of coupling gratings using UV casting and oblique ZnS evaporation.
    • Characterization of grating diffraction efficiencies via experimental measurements.

    Main Results:

    • The novel grating structures exhibit a blaze effect, leading to high diffraction efficiencies.
    • Measured diffraction efficiencies of approximately 70% for unpolarized light at 510 nm.
    • Simulations predict potential efficiencies of up to 90% for polarized light.

    Conclusions:

    • The developed coupling gratings represent an innovative approach to efficient light beam manipulation.
    • The asymmetric coating on symmetric gratings effectively enhances diffraction performance.
    • These gratings hold promise for applications requiring high-efficiency light redirection.