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Nanocrystalline silicon optomechanical cavities.

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    Nanocrystalline silicon optomechanical devices offer a cost-effective alternative to silicon-on-insulator, enabling complex nonlinear dynamics like self-pulsing and phonon lasing at low laser power.

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    Area of Science:

    • Optoelectronics
    • Nanotechnology
    • Materials Science

    Background:

    • Silicon-on-insulator (SOI) photonics is a key platform for integrated optomechanical circuits.
    • SOI technology faces challenges including high wafer costs and single-device limitations.

    Purpose of the Study:

    • To explore nanocrystalline silicon (nc-Si) as a viable alternative material for optomechanical devices.
    • To investigate the nonlinear dynamical behaviors of optomechanical cavities fabricated from nc-Si.

    Main Methods:

    • Fabrication of optomechanical crystal cavities using nanocrystalline silicon.
    • Characterization of optical and mechanical properties of the nc-Si cavities.
    • Analysis of nonlinear dynamical effects at low input laser power.

    Main Results:

    • Demonstrated that nc-Si optomechanical crystal cavities exhibit enabling optical and mechanical properties.
    • Observed nonlinear dynamical behaviors including thermo-optic/free-carrier-dispersion self-pulsing, phonon lasing, and chaos.
    • Achieved these effects at low input laser power with typical frequencies up to 0.3 GHz.

    Conclusions:

    • Nanocrystalline silicon is a promising material for advanced optomechanical devices.
    • nc-Si enables complex nonlinear phenomena at low power, overcoming SOI limitations.
    • This research opens avenues for cost-effective, high-frequency optomechanical systems.