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Compact and highly-efficient broadband surface grating antenna on a silicon platform.

Shahrzad Khajavi, Daniele Melati, Pavel Cheben

    Optics Express
    |March 17, 2021
    PubMed
    Summary

    We developed a compact silicon antenna using L-shaped elements. This surface grating antenna achieves 89% diffraction efficiency and operates across key optical communication bands.

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    Area of Science:

    • Photonics
    • Optical Engineering
    • Materials Science

    Background:

    • Surface grating antennas are crucial for optical communication systems.
    • Miniaturization and high efficiency are key challenges in antenna design.
    • Silicon photonics offers a platform for integrated optical devices.

    Purpose of the Study:

    • To design a compact silicon-based surface grating antenna.
    • To achieve high diffraction efficiency and broad operational bandwidth.
    • To ensure low reflectivity across standard optical communication bands.

    Main Methods:

    • Utilized subwavelength L-shaped radiating elements.
    • Fabricated the antenna using a 300-nm silicon core.
    • Simulated and characterized antenna performance, including diffraction efficiency, directionality, and reflectivity.

    Main Results:

    • Achieved a high diffraction efficiency of 89% (-0.5 dB).
    • Demonstrated a directionality of 0.94.
    • Maintained reflectivity below -10 dB across S, C, and L bands.
    • Obtained a broad 1-dB bandwidth of 230 nm centered at 1550 nm.
    • The antenna features a compact footprint of 7.6 µm × 4.5 µm.

    Conclusions:

    • The proposed silicon-based surface grating antenna offers a compact and efficient solution.
    • The design meets the demanding requirements for optical communication applications.
    • This work advances the development of integrated photonic components.