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    Area of Science:

    • Optoelectronics
    • Metamaterials
    • Nanotechnology

    Background:

    • Electromagnetically-induced-transparency (EIT) is a quantum interference phenomenon.
    • Graphene's unique properties make it suitable for tunable optical devices.
    • Metasurfaces offer subwavelength control over electromagnetic waves.

    Purpose of the Study:

    • To propose and analyze a graphene-based metasurface exhibiting tunable EIT-like spectral response.
    • To investigate the potential of this metasurface for refractive index sensing.
    • To explore the slow light characteristics of the proposed device.

    Main Methods:

    • Numerical simulations of a metasurface composed of graphene nano-disks and a nano-strip.
    • Analysis of resonance coupling and EIT-like window formation.
    • Investigation of frequency tunability via Fermi-level adjustment using external voltage.

    Main Results:

    • Demonstrated tunable EIT-like spectral response in the mid-infrared range.
    • Achieved a sensitivity of 3016.7 nm/(RIU) for refractive index sensing with a FOM > 12.0.
    • Observed slow light effects with a group index up to 200.

    Conclusions:

    • The proposed graphene metasurface offers a novel, tunable platform for EIT-like phenomena.
    • The device shows significant potential for high-performance sensing applications, including biochemical testing.
    • The design provides a miniaturized solution with post-fabrication tunability.