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Nonlinear frequency conversion using high-quality modes in GaAs nanobeam cavities.

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    We designed novel nanobeam photonic crystal cavities in (111)-GaAs. These cavities enable efficient nonlinear frequency conversion, demonstrating sum-frequency generation for quantum applications.

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    Area of Science:

    • Optics and photonics
    • Materials science
    • Quantum information science

    Background:

    • Photonic crystal cavities are essential for light manipulation.
    • Efficient nonlinear frequency conversion is key for quantum technologies.
    • Gallium arsenide (GaAs) is a versatile semiconductor material.

    Purpose of the Study:

    • To design and fabricate high-quality factor (high-Q) nanobeam photonic crystal cavities in (111)-GaAs.
    • To demonstrate multiple high-Q modes with large frequency separations for nonlinear optics.
    • To showcase sum-frequency generation for quantum networking applications.

    Main Methods:

    • Design and simulation of nanobeam photonic crystal structures.
    • Fabrication of (111)-oriented GaAs cavities using nanofabrication techniques.
    • Characterization of optical modes and nonlinear frequency conversion efficiency.

    Main Results:

    • Achieved nanobeam photonic crystal cavities with multiple high-Q modes.
    • Observed large frequency separations (up to 740 nm experimentally, octave theoretically).
    • Demonstrated sum-frequency generation from 1300/1950 nm to 780 nm.

    Conclusions:

    • The developed (111)-GaAs cavities are suitable for efficient nonlinear frequency conversion.
    • The demonstrated wavelengths are relevant for interfacing with Si vacancy centers in diamond and fiber-optic networks.
    • These cavities offer a promising platform for quantum frequency conversion and quantum information processing.