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Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities
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Full-color diffractive optical waveguide with low color dispersion for augmented reality.

Yongqi Sun, Kang Guo, Mengya Song

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    A novel diffractive optical waveguide system enhances augmented reality (AR) near-eye displays (NED) by using color filters and distributed Bragg reflectors to ensure color purity and uniformity across the field of view.

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    Area of Science:

    • Optics
    • Display Technology
    • Materials Science

    Background:

    • Augmented reality (AR) near-eye displays (NED) require high color fidelity.
    • Color dispersion and shift are significant challenges in achieving full-color displays.
    • Existing waveguide technologies struggle with maintaining color uniformity across the field of view.

    Purpose of the Study:

    • To develop a full-color diffractive optical waveguide scheme for AR NED.
    • To address and mitigate color dispersion issues within the waveguide.
    • To achieve excellent color uniformity and minimal color shift for an immersive visual experience.

    Main Methods:

    • Integration of a color filter (CF) to selectively filter heterochromatic light.
    • Utilization of a distributed Bragg reflector (DBR) to reflect undesired light rays.
    • Synergistic application of CF and DBR (CF/DBR) filters within the optical waveguide.

    Main Results:

    • Effective filtering of heterochromatic light, ensuring single primary color per waveguide.
    • Selective reflection of unwanted light by the DBR, guiding essential light.
    • Achieved color shift Δu'Δv' < 0.064 around the D65 white point.
    • Demonstrated excellent color uniformity across the entire field of view (FoV).

    Conclusions:

    • The developed CF/DBR integrated diffractive optical waveguide scheme effectively solves color dispersion issues in AR NED.
    • This innovative approach guarantees high color uniformity and minimal color shift, crucial for advanced AR applications.
    • The system provides a robust solution for next-generation full-color AR near-eye displays.