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Loading-effect-based three-dimensional microfabrication empowers on-chip Brillouin optomechanics.

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    Optics Letters
    |March 15, 2024
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    Researchers developed a novel suspended nanowire structure for integrated photonics, enabling strong confinement of optical and acoustic waves. This breakthrough advances on-chip stimulated Brillouin scattering (SBS) devices for scalable photonic integration.

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    Area of Science:

    • Integrated photonics
    • Acousto-optic interactions
    • Nanophotonics

    Background:

    • Stimulated Brillouin scattering (SBS) is key for integrated photonic devices.
    • Confining optical and acoustic waves is a major challenge for Brillouin devices.
    • Streamlined, scalable fabrication compatible with existing platforms is needed.

    Purpose of the Study:

    • To demonstrate a novel suspended nanowire structure for enhanced optical and acoustic wave confinement.
    • To introduce a CMOS-compatible, single-step microfabrication technique for Brillouin devices.
    • To advance the development of on-chip stimulated Brillouin scattering (SBS).

    Main Methods:

    • Fabrication of a suspended nanowire structure using a loading-effect-based 3D microfabrication technique.
    • Single-step lithography exposure compatible with CMOS technology.
    • Characterization of Brillouin gain and net gain on a silicon-on-insulator platform.

    Main Results:

    • Achieved a high Brillouin gain coefficient of 1100 W⁻¹m⁻¹.
    • Demonstrated a Brillouin net gain exceeding 4.1 dB with modest pump powers.
    • Successfully confined both photons and phonons within the novel nanowire structure.

    Conclusions:

    • The suspended nanowire structure effectively confines optical and acoustic waves.
    • The developed microfabrication technique streamlines production for large-scale integration.
    • This work significantly advances on-chip SBS, paving the way for integrated Brillouin photonic devices.