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    Area of Science:

    • Materials Science
    • Photonics
    • Nonlinear Optics

    Background:

    • III-nitrides, such as gallium nitride (GaN) and aluminum nitride (AlN), are promising materials for nonlinear photonics.
    • Existing nonlinear optical devices face limitations due to mode overlap issues in waveguide configurations.

    Purpose of the Study:

    • To explore a novel composite waveguide design using GaN and AlN layers with inverted polarity.
    • To enhance the efficiency of nonlinear optical interactions by improving mode overlap.

    Main Methods:

    • Theoretical modeling of composite waveguides with inverted polarity.
    • Experimental fabrication and characterization of GaN/AlN ridge waveguides.
    • Measurement of second harmonic generation (SHG) conversion efficiency.

    Main Results:

    • The composite waveguide design with inverted polarity effectively addresses mode overlap limitations.
    • Experimental demonstration of SHG with a conversion efficiency of 4%W⁻¹cm⁻².
    • Achieved efficiency is an order of magnitude higher than previous III-nitride waveguides.

    Conclusions:

    • Composite III-nitride waveguides with inverted polarity offer a significant advancement for nonlinear photonics.
    • The demonstrated efficiency highlights the potential for further improvements by reducing propagation losses.
    • This approach paves the way for highly efficient nonlinear optical devices based on III-nitrides.