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Waveguide-coupled hybrid plasmonic modulator based on graphene.

Bao-Hu Huang, Wei-Bing Lu, Xiao-Bing Li

    Applied Optics
    |July 28, 2016
    PubMed
    Summary
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    This study introduces a novel graphene electro-absorption modulator for high-speed optical communication. The device achieves low loss and high efficiency using a hybrid plasmonic waveguide, enabling faster data transmission.

    Area of Science:

    • Photonics
    • Materials Science
    • Electrical Engineering

    Background:

    • Electro-absorption modulators (EAMs) are crucial for high-speed optical communication.
    • Graphene offers unique optoelectronic properties for advanced modulator designs.
    • Hybrid plasmonic waveguides enhance light-matter interaction for compact devices.

    Purpose of the Study:

    • To propose and analyze a novel graphene-based electro-absorption modulator.
    • To achieve low transmission loss and high-speed modulation at 1.55 μm.
    • To demonstrate a compact modulator footprint with efficient waveguide coupling.

    Main Methods:

    • Utilizing double-layer graphene integrated with a horizontal hybrid plasmonic waveguide.
    • Leveraging the anisotropic in-plane permittivity of graphene for absorption modulation.

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  • Employing a taper silicon coupler for efficient optical coupling.

    • Main Results:

    • Significant modulation of absorption achieved over a 0.4 THz bandwidth.
    • Demonstrated a short modulation length of 8.5 μm.
    • Achieved 80% coupling efficiency with a taper silicon coupler.
    • Showcased modulation potential on a compact 1.6 μm² footprint.

    Conclusions:

    • The proposed graphene-based modulator offers a promising solution for next-generation optical communication systems.
    • The hybrid plasmonic waveguide design enhances light-graphene interaction for efficient modulation.
    • The compact footprint and high performance pave the way for integrated photonic circuits.