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    Area of Science:

    • Optics and Photonics
    • Integrated Photonics
    • Semiconductor Devices

    Background:

    • Cylindrical vector (CV) beams possess unique polarization singularities, driving interest in applications like optical manipulation and high-speed optical communication.
    • Existing methods for generating CV beams often lack the speed and integration required for advanced systems.
    • The demand for efficient and compact sources of CV beams is growing across various scientific and technological fields.

    Purpose of the Study:

    • To propose and demonstrate a novel high-speed integrated device for emitting fundamental cylindrical vector (CV) beams.
    • To enable the simultaneous generation of both radially and azimuthally polarized beams using a single platform.
    • To lay the groundwork for CV beam integration with multiplexing techniques for enhanced communication capacities.

    Main Methods:

    • Design and fabrication of two distinct grating-assisted concentric microcavities on an Indium Phosphide (InP) platform.
    • Optimization of a microcavity featuring a second-order grating for efficient azimuthally polarized CV beam emission.
    • Integration of triangular-shaped side and rectangular-shaped top gratings in another microcavity for radially polarized CV beam lasing.

    Main Results:

    • Successful demonstration of a high-speed integrated device capable of emitting fundamental CV beams.
    • Achieved distinct microcavity designs optimized for either radially or azimuthally polarized beam generation.
    • The proposed device architecture shows potential for integration with wavelength-division and mode-division multiplexing.

    Conclusions:

    • The developed InP-based device offers a high-speed and integrated solution for generating fundamental CV beams.
    • The distinct microcavity designs provide tailored emission of radially and azimuthally polarized light.
    • This technology holds significant promise for advancing CV beam-based classical and quantum communication systems.