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Tunable multilayer-graphene-based broadband metamaterial selective absorber.

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    Area of Science:

    • Materials Science
    • Optics and Photonics
    • Nanotechnology

    Background:

    • Metamaterials offer unique electromagnetic properties.
    • Graphene's tunable electronic characteristics are valuable for optical applications.
    • Efficient solar energy harvesting and reduced thermal loss are critical for energy technologies.

    Purpose of the Study:

    • To design and simulate a tunable, broadband metamaterial selective absorber based on multilayer graphene.
    • To achieve high absorption across the entire solar spectrum.
    • To minimize thermal radiative heat loss in the mid-infrared region.

    Main Methods:

    • Utilized the finite-difference time-domain (FDTD) method for electromagnetic simulations.
    • Designed a multilayer-graphene-based metamaterial structure incorporating nano-cylinders.
    • Investigated the effect of graphene's Fermi level on absorption properties.

    Main Results:

    • Achieved high absorption (88.3%) in the 250-2300 nm range, covering the full solar spectrum.
    • Demonstrated low thermal emittance (3.3%) in the 4-13 µm mid-infrared range, reducing heat loss.
    • Confirmed tunability of the cutoff wavelength by adjusting the graphene Fermi level.
    • Showcased angle-insensitive absorption characteristics.

    Conclusions:

    • The proposed graphene-based metamaterial acts as an efficient broadband selective absorber.
    • The device effectively minimizes thermal radiative losses, enhancing its applicability in energy systems.
    • Tunability and angle independence make this metamaterial suitable for advanced solar cells and thermal detectors.