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Characterization of SiN Integrated Optical Phased Arrays on a Wafer-Scale Test Station
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    Optics Letters
    |June 1, 2023
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    Summary

    This study presents a novel 128-channel 2-D optical phased array (OPA) using an aperiodic grid and sparse antenna distribution. This design significantly enhances beam steering range and field of view for optical phased arrays.

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    Area of Science:

    • Photonics and Optical Engineering
    • Antenna Array Design
    • Metamaterials and Nanophotonics

    Background:

    • Two-dimensional optical phased arrays (2-D OPAs) typically face limitations in beam scanning range and aperture size.
    • Existing OPA designs often require a large number of elements, increasing complexity and cost.

    Purpose of the Study:

    • To overcome the limitations of conventional 2-D OPAs by enhancing scan range and reducing element count.
    • To develop a sparse 2-D OPA with improved performance metrics.

    Main Methods:

    • Utilized an aperiodic 32x32 grid to expand the beam scanning capability.
    • Implemented a sparse distribution of 128 grating antennas across 1024 grid points to reduce array size.
    • Employed a genetic algorithm for optimizing grid spacings and antenna distribution.

    Main Results:

    • Achieved a grating-lobe-free steering range of 53°x16° at 1550 nm.
    • Demonstrated a field of view of 24°x16°.
    • Reported a beam divergence of 0.31°x0.49° and a sidelobe suppression ratio of 9 dB.

    Conclusions:

    • The proposed aperiodic and sparse antenna distribution effectively enhances the performance of 2-D OPAs.
    • This approach offers a promising solution for applications requiring wide-angle beam steering with reduced complexity.