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Binary sinusoidal single-order multilayer gratings for tender x-ray region.

Jihui Chen, Lai Wei, Zuhua Yang

    Journal of the Optical Society of America. A, Optics, Image Science, and Vision
    |June 17, 2020
    PubMed
    Summary

    We developed a binary sinusoidal multilayer grating (BSMG) to suppress unwanted diffractions. This optical element achieves high first-order diffraction efficiency, crucial for tender X-ray spectroscopy applications.

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    Area of Science:

    • Optics
    • Materials Science
    • X-ray Spectroscopy

    Background:

    • Diffractive optical elements are essential for manipulating light.
    • High-order diffractions can reduce the efficiency and purity of desired optical signals.
    • Existing gratings often struggle to balance high efficiency with suppression of unwanted orders.

    Purpose of the Study:

    • To propose and theoretically analyze a novel diffractive optical element for suppressing high-order diffractions.
    • To achieve high first-order diffraction efficiency using a specific grating design.
    • To investigate the impact of microstructure shape and multilayer coatings on diffraction properties.

    Main Methods:

    • Theoretical analysis of a single-order diffractive optical element: binary sinusoidal multilayer grating (BSMG).
    • Integration of sinusoidal-shaped microstructures with high-reflectivity multilayer coatings.
    • Investigation of diffraction properties dependence on microstructure shape and multilayer coatings.

    Main Results:

    • Suppression of second-, third-, fourth-, and fifth-order diffraction efficiencies to as low as 0.01%.
    • Achieved a first-order relative diffraction efficiency of 97.7%.
    • Demonstrated the effectiveness of the BSMG design in controlling diffraction orders.

    Conclusions:

    • The proposed binary sinusoidal multilayer grating (BSMG) effectively suppresses high-order diffractions.
    • BSMG offers high first-order diffraction efficiency, making it suitable for advanced applications.
    • This technology holds significant promise for the development of tender X-ray spectroscopy.