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Blazed grating enables highly decoupled optically variable devices fabricated by vibration-assisted diamond

Jianjian Wang, Yaoke Wang, Jianfu Zhang

    Optics Express
    |March 18, 2022
    PubMed
    Summary

    New vibration-assisted diamond texturing creates highly decoupled optically variable devices (OVDs) with tunable light concentration. This method enables high-resolution, structurally colored graphics for anti-counterfeiting and decorative uses.

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    Area of Science:

    • Materials Science
    • Optics
    • Nanotechnology

    Background:

    • Optically variable devices (OVDs) are crucial for anti-counterfeiting and decorative applications.
    • Existing OVDs often lack sufficient decoupling and precise optical control.

    Purpose of the Study:

    • To develop novel, highly decoupled OVDs using vibration-assisted diamond texturing.
    • To explore a new surface generation mechanism for creating blazed gratings with controlled optical properties.

    Main Methods:

    • Utilized vibration-assisted diamond texturing for fast patterning of blazed gratings.
    • Investigated a combined cutting and forming surface generation mechanism.
    • Modulated cutting velocity to control grating distribution and generate structural color.
    • Designed and fabricated orthogonal-type and in-plane-type OVDs.

    Main Results:

    • Demonstrated a unique surface generation mechanism involving cutting and forming.
    • Achieved high-resolution, structurally colored graphics with tunable light concentration.
    • Successfully fabricated two types of highly decoupled OVDs (orthogonal and in-plane).
    • Optical simulations based on extended scalar diffraction theory validated experimental results.

    Conclusions:

    • Vibration-assisted diamond texturing offers a viable method for producing advanced OVDs.
    • The developed OVDs exhibit high decoupling and flexible control over diffracted light.
    • This technology has significant potential for enhanced anti-counterfeiting and novel decorative applications.