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    Area of Science:

    • Integrated Optics
    • Materials Science
    • Photonics

    Background:

    • Lithium niobate on insulator (LNOI) offers strong optical confinement and versatile electro-optic properties.
    • Vertically asymmetric waveguides exhibit mode hybridization.
    • Existing methods for polarization control can be complex.

    Purpose of the Study:

    • To demonstrate an efficient polarization mode converter using LNOI ridge waveguides.
    • To leverage mode hybridization for polarization control.
    • To simplify fabrication and enable active switching in photonic circuits.

    Main Methods:

    • Utilizing the electro-optic effect to modulate mode hybridization in LNOI ridge waveguides.
    • Designing a device that avoids tapering and periodic poling.
    • Implementing active switching capabilities via external fields.

    Main Results:

    • Achieved a polarization mode converter with 97% efficiency.
    • Demonstrated efficient modulation of mode hybridization.
    • Showcased a simplified fabrication process compared to traditional methods.

    Conclusions:

    • LNOI ridge waveguides provide a promising platform for efficient polarization control.
    • The proposed device simplifies fabrication and allows for active switching.
    • This technology can advance integrated photonics circuits and sensors.