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Updated: Jun 22, 2026

Fabrication of High Contrast Gratings for the Spectrum Splitting Dispersive Element in a Concentrated Photovoltaic System
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Diffractive elements with novel antireflection film stacks.

Henna Elfström, Tuomas Vallius, Markku Kuittinen

    Optics Express
    |June 3, 2009
    PubMed
    Summary
    This summary is machine-generated.

    Simultaneous design of antireflection coatings and diffractive structures effectively reduces Fresnel losses for high-index infrared substrates. Thicker antireflection films significantly minimize the Fabry-Perot effect, enhancing optical performance.

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    Area of Science:

    • Optics and Photonics
    • Materials Science

    Background:

    • Fresnel losses and the Fabry-Perot effect are significant challenges in optical systems, particularly with high-index substrates.
    • Optimizing antireflection coatings is crucial for infrared applications.

    Purpose of the Study:

    • To investigate the simultaneous design of antireflection coatings and diffractive microstructures.
    • To effectively reduce Fresnel losses and the Fabry-Perot effect in infrared optics.

    Main Methods:

    • Fabrication of antireflection coatings between the substrate and diffractive microstructure.
    • Simultaneous design of the diffractive structure and the antireflection stack.
    • Utilizing antireflection layers with films thicker than standard quarter-wave films.

    Main Results:

    • Demonstrated effective reduction of Fresnel losses, especially for high-index substrates in the infrared region.
    • Achieved substantial reduction of the Fabry-Perot effect.
    • Optimized performance through simultaneous design and use of thicker antireflection films.

    Conclusions:

    • Simultaneous design is key for effective antireflection in diffractive optics with high-index substrates.
    • Thicker antireflection films offer a viable method to suppress the Fabry-Perot effect.
    • The presented approach enhances optical efficiency in infrared applications.