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Enhanced all-optical cavity-tuning using graphene.

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    We demonstrate a novel graphene-oxide-silicon waveguide system for efficient all-optical tuning of optical resonance. This system achieves superior tuning efficiency and dynamic range for optical signal processing applications.

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    Area of Science:

    • Photonics and optical engineering
    • Materials science
    • Nanotechnology

    Background:

    • All-optical tuning of optical cavity resonance is crucial for optical signal processing, including modulation, switching, and routing.
    • In conventional silicon-on-insulator (SOI) and graphene-on-SOI systems, optical absorption induces charge-carrier generation and heat generation, which shift resonance in opposite directions, limiting tuning efficiency and dynamic range.

    Purpose of the Study:

    • To investigate an all-optical resonance-tuning system using a graphene-oxide-silicon waveguide.
    • To overcome the limitations of existing systems by suppressing competing effects and enhancing the thermo-optic effect.

    Main Methods:

    • Fabrication of a graphene-oxide-silicon waveguide system.
    • Characterization of all-optical resonance tuning efficiency and dynamic range.
    • Analysis of the underlying physical mechanisms, including thermo-optic effects and free-carrier dispersion.

    Main Results:

    • Demonstrated exceptional resonance-tuning efficiency of 300 pm/mW (0.055 π/mW).
    • Achieved a large dynamic range of 1.2 nm (0.22 π), extending from linear resonance to optical bistability.
    • Identified the dominant role of linear-absorption-induced thermo-optic effect and suppressed free-carrier dispersion due to structural design.

    Conclusions:

    • The graphene-oxide-silicon waveguide system offers significantly improved performance for all-optical cavity tuning.
    • This approach provides new avenues for enhancing graphene-on-waveguide devices for low-frequency all-optical modulation and switching applications.