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Graphene plasmons isolator based on non-reciprocal coupling.

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    Summary
    This summary is machine-generated.

    This study introduces a novel graphene plasmons isolator using a double graphene layer waveguide. This device achieves magnetic control for non-reciprocal coupling, enabling applications in graphene plasmons circuits.

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    Area of Science:

    • Photonics and Plasmonics
    • Condensed Matter Physics
    • Materials Science

    Background:

    • Graphene plasmonics offers unique light-matter interaction properties.
    • Non-reciprocal devices are crucial for integrated photonic circuits.
    • Magneto-optical substrates are key for breaking time-reversal symmetry.

    Purpose of the Study:

    • To propose and theoretically investigate a graphene plasmons isolator.
    • To demonstrate magnetic control over non-reciprocal coupling in a double graphene layer waveguide.
    • To explore the performance of the proposed device concerning various parameters.

    Main Methods:

    • Theoretical investigation using coupled mode theory (CMT).
    • Numerical simulations using finite element methods (FEM).
    • Systematic analysis of insertion losses and isolation ratios.

    Main Results:

    • Achieved non-reciprocal coupling in a double graphene layer waveguide on a magneto-optical substrate.
    • Demonstrated magnetic control for plasmons circulator and isolator functionalities.
    • Theoretical isolation ratio of 42 dB was predicted, with analysis of influencing factors.

    Conclusions:

    • The proposed graphene plasmons isolator and circulator show promising performance.
    • The device can serve as a fundamental building block for future graphene plasmons circuits.
    • Further research can optimize device parameters for practical applications.