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Thickness optimization algorithm to improve multilayer diffractive optical elements performance.

Victor Laborde, Jérôme Loicq, Juriy Hastanin

    Applied Optics
    |February 23, 2023
    PubMed
    Summary
    This summary is machine-generated.

    This study introduces an algorithm to optimize multilayer diffractive optical element (MLDOE) zone thicknesses, overcoming limitations of the thin element approximation (TEA) for improved optical performance.

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    Area of Science:

    • Optics and Photonics
    • Optical Engineering
    • Materials Science

    Background:

    • Conventional diffractive optical elements (DOEs) often use the thin element approximation (TEA) for zone thickness calculations.
    • The TEA provides inaccurate results for thick multilayer DOEs (MLDOEs), limiting their design precision.

    Purpose of the Study:

    • To develop a novel algorithm for optimizing MLDOE zone thicknesses.
    • To address the inaccuracies of the TEA for thick MLDOEs by utilizing the extended scalar theory (EST).

    Main Methods:

    • Developed an algorithm combining ray-tracing and Fourier optics to evaluate EST parameters.
    • Researched suitable input parameters for the extended scalar theory (EST).
    • Analyzed MLDOE designs using rigorous finite-difference time-domain (FDTD) methods.

    Main Results:

    • The proposed algorithm successfully identified optimal EST parameters for MLDOE design.
    • The algorithm-derived zone thicknesses showed improved performance compared to TEA-based methods.
    • Finite-difference time-domain (FDTD) analysis confirmed the effectiveness of the optimized MLDOE designs.

    Conclusions:

    • The developed algorithm offers a more accurate method for determining MLDOE zone thicknesses than the conventional TEA.
    • This approach enhances the design and performance of multilayer diffractive optical elements.