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Tunable multispectral plasmon induced transparency based on graphene metamaterials.

Chen Sun, Jiangnan Si, Zhewei Dong

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    |July 14, 2016
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    This study introduces a tunable terahertz device using graphene metamaterials to create plasmon induced transparency (PIT). The device offers dynamic control over multiple transparency windows for advanced optical applications.

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    Area of Science:

    • Terahertz (THz) Photonics
    • Metamaterials Science
    • Graphene-based Optoelectronics

    Background:

    • Plasmon induced transparency (PIT) mimics electromagnetically induced transparency (EIT) in metamaterials.
    • Graphene's tunable electronic properties make it suitable for dynamic optical devices.

    Purpose of the Study:

    • To theoretically and numerically propose a tunable multispectral PIT device in the terahertz range.
    • To investigate the physical mechanism of multispectral PIT using a coupled Lorentz oscillator model.
    • To demonstrate active control over PIT resonances via graphene's Fermi energy.

    Main Methods:

    • Theoretical modeling using a coupled Lorentz oscillator model.
    • Numerical simulations employing the finite-difference time-domain (FDTD) method.
    • Design and analysis of a graphene metamaterial structure with double layers and a dielectric spacer.

    Main Results:

    • Achieved dynamically wavelength tunable multispectral PIT in the terahertz frequency range.
    • Demonstrated control over PIT resonance shifting and depth through geometrical parameters and Fermi energy.
    • Showcased independent tuning of resonance frequencies by electrostatic control of graphene Fermi energies.

    Conclusions:

    • The proposed graphene metamaterial device enables active control of multispectral PIT.
    • The device holds potential for applications in optical information processing, including tunable sensors, switches, and filters in the terahertz spectrum.