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Ultracompact temporal integrator using graphene-based long-range hybrid plasmonic waveguides.

Azadeh Karimi, Abbas Zarifkar, Mehdi Miri

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    Researchers developed a novel graphene-based temporal integrator for ultrafast signal processing. This compact device offers an 11x longer integration time than previous designs, enabling advanced photonic applications.

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    Area of Science:

    • Photonics and Plasmonics
    • Materials Science (Graphene)
    • Optical Signal Processing

    Background:

    • Temporal integration is crucial for optical signal processing.
    • Existing microring-based integrators are limited by their footprint and integration time.
    • Graphene's unique properties offer potential for miniaturized photonic devices.

    Purpose of the Study:

    • To propose and investigate a novel microdisk-resonator add-drop temporal integrator.
    • To leverage a long-range hybrid plasmonic waveguide with graphene as the central layer.
    • To evaluate the device's integration time, footprint, and bandwidth.

    Main Methods:

    • Device fabrication concept: Microdisk-resonator structure with a graphene-central-layer hybrid plasmonic waveguide.
    • Simulation technique: Three-dimensional finite-difference time-domain (3D-FDTD) simulations.
    • Performance metrics: Integration time, footprint size, and full width at half maximum (FWHM).

    Main Results:

    • Achieved a significant integration time of approximately 5.55 picoseconds (ps).
    • Demonstrated a highly compact footprint of approximately 4 µm x 3 µm.
    • Obtained a full width at half maximum (FWHM) of 53 GHz.

    Conclusions:

    • The proposed graphene-based temporal integrator offers a substantial improvement in integration time (11x longer) compared to previous plasmonic designs.
    • The device exhibits a highly miniaturized footprint, making it suitable for integration into compact systems.
    • This technology holds promise for advancing ultrafast plasmonic-based signal processing systems.