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Characterization of SiN Integrated Optical Phased Arrays on a Wafer-Scale Test Station
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Two-dimensional apodized silicon photonic phased arrays.

Jie Sun, Ehsan shah Hosseini, Ami Yaacobi

    Optics Letters
    |February 25, 2014
    PubMed
    Summary
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    Researchers created an 8x8 silicon photonic phased array with 64 nanoantennas. This design suppresses far-field optical beam sidelobes by tailoring near-field emission to Gaussian profiles, enabling dynamic beam shaping.

    Area of Science:

    • Photonics
    • Optical Engineering
    • Nanotechnology

    Background:

    • Phased arrays are crucial for beam steering and shaping in optical systems.
    • Traditional uniform phased arrays often suffer from significant sidelobe levels in the far-field.
    • Tailoring antenna emission profiles offers a potential method for sidelobe suppression.

    Purpose of the Study:

    • To demonstrate an 8x8 apodized silicon photonic phased array for enhanced optical beam control.
    • To investigate the suppression of far-field sidelobes using tailored nanoantenna emission.
    • To showcase dynamic optical beam shaping capabilities through integrated phase tuners.

    Main Methods:

    • Fabrication of an 8x8 silicon photonic phased array comprising 64 nanoantennas.
    • Tailoring the near-field emission of each nanoantenna to a Gaussian intensity distribution.

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  • Integration of 72 thermo-optic phase tuners for precise phase control.
  • Characterization of far-field optical beam patterns and sidelobe levels.

    • Main Results:

    • Successful demonstration of an 8x8 apodized silicon photonic phased array.
    • Achieved suppression of far-field optical beam sidelobes compared to uniform arrays.
    • Gaussian-shaped near-field intensity distributions resulted in reduced sidelobes.
    • Dynamic and versatile shaping of the optical beam in the far field was achieved.

    Conclusions:

    • Apodized silicon photonic phased arrays with Gaussian-shaped nanoantenna emission effectively suppress far-field sidelobes.
    • The integrated thermo-optic phase tuners provide dynamic control over optical beam shaping.
    • This technology holds promise for advanced optical beam manipulation applications.