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    Area of Science:

    • Terahertz (THz) technology
    • Metamaterials and Nanophotonics

    Background:

    • Metasurfaces offer precise control over electromagnetic waves.
    • Tunable terahertz devices are crucial for advanced wave manipulation.

    Purpose of the Study:

    • To design and demonstrate a tunable terahertz metasurface for spectrum splitting.
    • To achieve independent control over terahertz wave reflection directions based on frequency.

    Main Methods:

    • Designing a metasurface with two types of trapezoid graphene ribbons on a gold film, separated by a dielectric spacer.
    • Utilizing the tunable electronic properties of graphene by adjusting its Fermi level.
    • Investigating the phase shift and reflection efficiency across different terahertz frequencies.

    Main Results:

    • Achieved a nearly 2π phase shift with high reflection efficiency using graphene ribbons.
    • Demonstrated independent reflection of different terahertz frequencies in distinct directions.
    • Confirmed the tunability of the metasurface's frequency response by altering the graphene Fermi level.

    Conclusions:

    • The proposed metasurface enables tunable spectrum splitting in the terahertz domain.
    • This technology provides a powerful platform for controlling terahertz waves.
    • Potential applications include wide-angle beam splitters and advanced terahertz optical systems.