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Tunable circular polarization selective surfaces for low-THz applications using patterned graphene.

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    Area of Science:

    • Electromagnetics
    • Materials Science
    • Nanotechnology

    Background:

    • Polarization selective surfaces are crucial for controlling electromagnetic wave polarization.
    • Conventional designs often suffer from large physical dimensions and limited tunability.
    • Graphene's unique electromagnetic properties offer potential for miniaturized and reconfigurable devices.

    Purpose of the Study:

    • To demonstrate a frequency-tunable polarization selective surface using graphene.
    • To achieve selective reflection and transmission of circularly polarized waves.
    • To investigate the device's performance under oblique incidence and its tunability.

    Main Methods:

    • Design of a three-layer unit cell incorporating graphene dipoles.
    • Excitation of localized surface plasmonic resonance for miniaturization.
    • Full-wave analysis to evaluate performance metrics like isolation and transmission loss.
    • Investigation of frequency tuning by varying graphene's chemical potential.

    Main Results:

    • The proposed graphene-based surface exhibits 21 dB isolation for Left-Hand-Circular-Polarization (LHCP) waves.
    • Transmission loss is approximately 5.1 dB for Right-Hand-Circular-Polarization (RHCP) waves.
    • The device maintains functionality for incident angles up to 40°.
    • Significant frequency reconfiguration is achieved by tuning graphene's chemical potential.

    Conclusions:

    • The developed graphene polarization selective surface offers a compact and tunable solution for THz applications.
    • The design successfully separates LHCP and RHCP waves with high performance.
    • The tunability via graphene's chemical potential enables frequency reconfiguration capabilities.