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Graphene-based tunable plasmonic Bragg reflector with a broad bandwidth.

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    We developed a tunable graphene plasmonic Bragg reflector for broadband filters and modulators. Introducing a defect creates a microcavity for graphene-based resonators, offering tunable optical properties.

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    Area of Science:

    • Photonics and Nanotechnology
    • Materials Science

    Background:

    • Graphene's unique electronic properties enable novel plasmonic devices.
    • Plasmonic Bragg reflectors offer potential for compact optical components.

    Purpose of the Study:

    • To propose and analyze a tunable plasmonic Bragg reflector in a graphene waveguide.
    • To investigate the formation of a defect-induced microcavity within the reflector.

    Main Methods:

    • Numerical analysis of graphene plasmonic Bragg reflector.
    • Simulation of tunable stopband characteristics based on Fermi energy.
    • Modeling of defect-induced Fabry-Perot-like microcavity.

    Main Results:

    • Achieved a broadband stopband tunable via graphene's Fermi energy.
    • Demonstrated a defect microcavity with a quality factor of 50.
    • Identified potential for broadband ultrafast tunable integrated filters and modulators.

    Conclusions:

    • The proposed graphene plasmonic Bragg reflector offers broadband tunability.
    • The defect microcavity shows promise for graphene-based resonators and integrated photonic devices.