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Characterization of SiN Integrated Optical Phased Arrays on a Wafer-Scale Test Station
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Aliasing-free optical phased array beam-steering with a plateau envelope.

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    Summary
    This summary is machine-generated.

    This study demonstrates a novel optical phased array (OPA) capable of generating a uniform beam intensity for optical beam-forming. The fabricated silicon-on-insulator device achieves aliasing-free beam-steering across a wide field-of-view.

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    Area of Science:

    • Photonics and Optical Engineering
    • Integrated Optics
    • Nanophotonics

    Background:

    • Optical phased arrays (OPAs) are crucial for beam-forming applications.
    • Achieving a uniform beam intensity and wide steering range in OPAs remains a challenge.

    Purpose of the Study:

    • To investigate the feasibility of generating a plateau envelope for beam-steering using OPAs.
    • To develop design guidelines for integrated OPAs with enhanced beam characteristics.

    Main Methods:

    • Numerical simulations were performed to establish design guidelines.
    • A silicon-on-insulator (SOI) chip was fabricated, featuring a coupling-suppressed curved waveguide array and a silica cavity.
    • Experimental verification of the fabricated device was conducted.

    Main Results:

    • The fabricated OPA achieved aliasing-free beam-steering over a field-of-view from -32° to 32° with 6.71° addressability.
    • A plateau beam envelope was demonstrated with peak intensity fluctuation below 0.45 dB within the -30° to 30° range.
    • The device utilized a 0.8 μm pitch waveguide array and a 1 μm silica cavity for envelope tailoring.

    Conclusions:

    • The study confirms the feasibility of generating a plateau envelope for beam-steering with OPAs.
    • The results represent a significant advancement towards integrated OPAs for optical beam-forming.
    • The demonstrated device offers a large aliasing-free steering range and uniform beam intensity.