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Related Experiment Video

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Characterization of SiN Integrated Optical Phased Arrays on a Wafer-Scale Test Station
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On-chip silicon optical phased array for two-dimensional beam steering.

David Kwong, Amir Hosseini, John Covey

    Optics Letters
    |February 25, 2014
    PubMed
    Summary

    This study presents a 16-element optical phased array for two-dimensional beam steering. The chip-based device achieves a wide field of view using silicon photonics and thermo-optic control.

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    Area of Science:

    • Photonics and Optical Engineering
    • Integrated Optics
    • Silicon Photonics

    Background:

    • Optical phased arrays are crucial for beam steering applications.
    • Existing methods face challenges in miniaturization and efficiency.
    • Silicon photonics offers a scalable platform for integrated optical devices.

    Purpose of the Study:

    • To demonstrate a compact, on-chip 16-element optical phased array for 2D beam steering.
    • To investigate the use of wavelength tuning and thermo-optic phase shifting for beam control.
    • To evaluate the performance of a silicon waveguide grating with a polycrystalline silicon overlay.

    Main Methods:

    • Fabrication of a 16-element optical phased array on a silicon-on-insulator platform.
    • Implementation of a hybrid steering mechanism combining wavelength tuning and thermo-optic phase shifting.
    • Utilizing a silicon waveguide grating with a polycrystalline silicon overlay for beam shaping.

    Main Results:

    • Achieved two-dimensional optical beam steering over a 20°×15° field of view.
    • Demonstrated narrow far-field beam widths of 1.2°×0.5°.
    • Reported a sidelobe level better than 10 dB with a switching power of 20 mW per channel.

    Conclusions:

    • The integrated optical phased array enables efficient and precise 2D beam steering.
    • The proposed grating structure simplifies fabrication while maintaining performance.
    • This technology holds promise for applications requiring compact and steerable optical beams.