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Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities
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Enhanced anti-crossing in resonant reflection via structured waveguide gratings.

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    Structured waveguide gratings enable controlled optical coupling ratios. This allows for strong coupling, creating a new platform for studying coupled systems, verified experimentally in the mid-IR.

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    Area of Science:

    • Optics and Photonics
    • Materials Science
    • Condensed Matter Physics

    Background:

    • Waveguide gratings are crucial optical components.
    • Controlling optical coupling strength in different diffraction orders is challenging.
    • Structured gratings offer a novel approach to manipulate light-matter interactions.

    Purpose of the Study:

    • To introduce the concept of structured period gratings.
    • To demonstrate their capability for achieving strong optical coupling.
    • To provide experimental validation of structured gratings for studying coupled systems.

    Main Methods:

    • Theoretical description of structured period gratings.
    • Numerical simulations of resonant reflection spectra.
    • Experimental verification using Gallium Nitride (GaN) on sapphire in the mid-infrared (mid-IR) spectral range.

    Main Results:

    • Structured gratings exhibit a controlled ratio of optical coupling strengths between diffraction orders.
    • Weak first-order coupling leads to sharp mode excitation resonances.
    • Strong second-order coupling results in large anti-crossing phenomena, significantly exceeding resonance spectral widths.

    Conclusions:

    • Structured waveguide gratings provide a versatile platform for studying strongly coupled systems.
    • The demonstrated control over coupling ratios opens new avenues in optical device design.
    • Experimental results confirm the theoretical predictions for mid-IR applications.