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Tunable slow light device based on a graphene metasurface.

Yumin Gong, Baogang Quan, Fangrong Hu

    Optics Letters
    |September 14, 2023
    PubMed
    Summary

    This study introduces a novel graphene-based device for electrically controlling terahertz (THz) slow light. The device achieves significant group delay modulation, paving the way for advanced nanophotonic applications.

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    Area of Science:

    • Photonics
    • Materials Science
    • Electrical Engineering

    Background:

    • Slow light devices are crucial for optical memory, switching, and quantum optics.
    • Developing slow light devices with tunable group delay remains a significant challenge.

    Purpose of the Study:

    • To propose and experimentally demonstrate a graphene-based slow light device capable of electrically modulating terahertz (THz) wave group delay.
    • To achieve large tunable group delay variations for advanced nanophotonic applications.

    Main Methods:

    • Fabrication of a unit cell comprising U-shaped and Ω-shaped metal resonators with embedded graphene ribbons.
    • Electrical modulation of graphene properties to control THz wave propagation.
    • Experimental characterization and simulation of device performance, including modulation depth and group delay.

    Main Results:

    • Achieved a high amplitude modulation depth of 74% under electrical stimuli.
    • Observed a maximum transmission amplitude of 0.7 at 0.6 THz.
    • Demonstrated a maximum group delay variation of 5 ps at 0.76 THz, with a maximum group delay amplitude of 8.8 ps.

    Conclusions:

    • The proposed graphene-based device effectively modulates THz slow light via electrical control.
    • The experimental results align well with simulations, validating the device design.
    • This work offers a new pathway for developing novel switchable nanophotonic and slow light devices.