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Integrated ray-wave optics modeling for macroscopic diffractive lighting devices.

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    We developed a hybrid optics model for advanced lighting devices with diffractive elements. This method enhances light extraction and directional beaming in GaN-based LEDs, crucial for future displays.

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    Area of Science:

    • Optics and Photonics
    • Materials Science
    • Semiconductor Devices

    Background:

    • Macroscopic lighting devices often use diffractive elements to control light.
    • Accurate modeling of light interaction with highly diffractive structures is challenging.
    • Gallium Nitride (GaN)-based light-emitting diodes (LEDs) are key components in modern illumination and displays.

    Purpose of the Study:

    • To develop a high-accuracy hybrid optics modeling approach for lighting devices with diffractive elements.
    • To simulate and analyze light extraction efficiency and far-field patterns in GaN-based LEDs with embedded 2D gratings.
    • To understand the relationship between grating index contrast and light outcoupling mechanisms.

    Main Methods:

    • Rigorous coupled-wave analysis (RCWA) was used to determine diffraction distributions for 2D gratings.
    • A hybrid ray-wave optics model integrated diffuse scattering information onto a virtual surface.
    • Fourier analysis was employed to understand grating-induced mode conversion and light outcoupling.

    Main Results:

    • The hybrid model accurately predicted extraction efficiencies and far-field distributions for millimeter-scale GaN-based LEDs.
    • Increased index contrast in 2D gratings significantly improved light extraction through the substrate's top face.
    • A vertical beaming effect was observed and validated by experimental data, linked to high-order diffraction modes.

    Conclusions:

    • The developed hybrid optics simulation strategy is effective for designing directional lighting and micro-LED displays.
    • High-index-contrast gratings are crucial for efficient conversion of waveguide modes into extractable light.
    • This modeling approach provides essential insights for optimizing light extraction in advanced LED technologies.