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Frequency-tunable terahertz angular selectivity based on a dielectric-graphene multilayer structure.

Feng Wu, Yang Long, Hongju Li

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    This study presents a tunable metamaterial for terahertz frequencies. The epsilon-near-zero (ENZ) device offers frequency-tunable angular selectivity, useful for advanced antenna applications.

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    Area of Science:

    • Metamaterials
    • Terahertz Technology
    • Optoelectronics

    Background:

    • Terahertz (THz) frequencies present unique challenges for signal manipulation.
    • Achieving tunable angular selectivity is crucial for applications like directive antennas.
    • Epsilon-near-zero (ENZ) materials offer unique electromagnetic properties.

    Purpose of the Study:

    • To design and demonstrate a frequency-tunable ENZ metamaterial for THz applications.
    • To achieve angular selectivity that can be controlled by an external parameter.
    • To explore the potential of graphene-based metamaterials for advanced THz devices.

    Main Methods:

    • A subwavelength dielectric-graphene multilayer structure was designed.
    • The ENZ frequency was dynamically tuned using gate voltage applied to graphene.
    • Transmittance angular spectra were analyzed to evaluate angular selectivity.

    Main Results:

    • The designed structure exhibits frequency-tunable angular selectivity at THz frequencies.
    • Optimal directivity (D) reached 183, with transmittance at normal incidence of 0.462.
    • The ENZ frequency was successfully tuned via gate voltage control of graphene.

    Conclusions:

    • The developed multilayer tunable THz ENZ metamaterial demonstrates effective frequency-tunable angular selection.
    • This technology holds promise for applications in tunable, highly directive antennas.
    • Graphene's tunability is key to advancing metamaterial functionalities in the THz regime.