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    Area of Science:

    • Optics and Photonics
    • Metamaterials
    • Terahertz Technology

    Background:

    • Metasurfaces offer unique electromagnetic properties.
    • Achieving ultra-broadband absorption in terahertz frequencies is challenging.
    • Existing absorbers often have limited bandwidth or efficiency.

    Purpose of the Study:

    • To design and demonstrate an ultra-broadband terahertz absorber.
    • To achieve high absorption over a wide frequency range.
    • To explore the potential of bi-metasurfaces for terahertz detection.

    Main Methods:

    • Fabrication of a bi-metasurface absorber with two stacked metasurfaces.
    • Utilizing multiplexed cross resonators with varying geometries and sizes.
    • Employing a metallic ground plane and parylene dielectric layers.
    • Experimental characterization of the absorption spectrum.

    Main Results:

    • Demonstrated an ultra-broadband terahertz absorber with absorption >50% over a 4.46 THz bandwidth.
    • The bottom metasurface achieved 3.80 THz bandwidth at high frequencies.
    • The top metasurface and Salisbury screen provided low-frequency absorption, bridging the bands.
    • Achieved a full width at half maxima (FWHM) of 97.7%.

    Conclusions:

    • The proposed bi-metasurface absorber enables ultra-broadband absorption in the terahertz regime.
    • The design effectively combines multiple absorption mechanisms for wideband performance.
    • This absorber is a promising candidate for terahertz broadband detection applications.