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Related Experiment Video

Updated: Jul 9, 2026

Fabrication of High Contrast Gratings for the Spectrum Splitting Dispersive Element in a Concentrated Photovoltaic System
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Published on: July 18, 2015

High-efficiency subwavelength diffractive element patterned in a high-refractive-index material for 633 nm.

S Astilean, P Lalanne, P Chavel

    Optics Letters
    |December 18, 2007
    PubMed
    Summary

    High-index materials enable efficient subwavelength diffractive components for visible light. Fabricated titanium dioxide blazed gratings show high diffraction efficiency, surpassing traditional designs.

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    Fabrication of Refractive-index-matched Devices for Biomedical Microfluidics
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    Fabrication of Refractive-index-matched Devices for Biomedical Microfluidics

    Published on: September 10, 2018

    Area of Science:

    • Optics and Photonics
    • Materials Science

    Background:

    • Subwavelength diffractive components are crucial for visible light applications.
    • Fabrication of high-performance diffractive optics often faces constraints.

    Purpose of the Study:

    • To explore the use of high-index materials for fabricating subwavelength diffractive components.
    • To reduce fabrication constraints and improve theoretical performance.

    Main Methods:

    • Design and fabrication of a blazed grating with subwavelength binary features.
    • Utilized a titanium dioxide (TiO2) layer on a glass substrate.
    • Period of the grating was 5.75 wavelengths.

    Main Results:

    • Achieved a first-order diffraction efficiency of 83% using a He-Ne laser.
    • The experimental efficiency slightly exceeded the theoretical performance of standard continuous-profile blazed gratings.

    Conclusions:

    • High-index materials offer a promising route for advanced diffractive optics.
    • Subwavelength binary features in TiO2 can lead to highly efficient visible-domain components.