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Graphene-based multifunctional three-port THz and long-wave infrared components.

Victor Dmitriev, Geraldo Melo, Wagner Castro

    Applied Optics
    |June 17, 2020
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    Summary

    Two novel graphene T-shaped components function as versatile THz and long-wave infrared devices. These components act as dividers and switches, with one offering dynamic filtering capabilities controlled electrostatically.

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    Area of Science:

    • Optoelectronics
    • Materials Science
    • Nanotechnology

    Background:

    • Graphene's unique electronic and optical properties enable novel device functionalities.
    • Terahertz (THz) and long-wave infrared (LWIR) technologies require efficient and controllable components.

    Purpose of the Study:

    • To propose and analyze two graphene-based T-shaped multifunctional components.
    • To demonstrate their capabilities as dividers, switches, and filters in the THz and LWIR regions.

    Main Methods:

    • Utilizing numerical simulations to analyze surface plasmon-polariton wave propagation in graphene waveguides and resonators.
    • Designing T-junctions with circular graphene resonators and waveguides on a SiO2/Si substrate.
    • Investigating electrostatic field control of graphene Fermi energy for dynamic switching.

    Main Results:

    • The first component, featuring a circular resonator, acts as a switchable divider with -4.3 dB transmission and 9.5% FWHM in the ON state.
    • High isolation of -30 dB is achieved in the OFF state for the first component.
    • The second component, a resonator-less T-junction, functions as a broadband divider-switch over an octave frequency band.

    Conclusions:

    • Graphene T-shaped components offer promising solutions for THz and LWIR applications.
    • Dynamic control via electrostatic gating enables versatile device operation.
    • The proposed designs pave the way for advanced optoelectronic integrated circuits.