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MOSFET: Enhancement Mode01:22

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    Area of Science:

    • Photonics and Optoelectronics
    • Materials Science (Graphene)
    • Nanotechnology

    Background:

    • All-optical graphene modulators offer ultrafast ( > 100 GHz) and broadband responses.
    • Silicon photonics provides cost-effectiveness and CMOS compatibility.
    • Graphene possesses a large nonlinear Kerr coefficient crucial for optical modulation.

    Purpose of the Study:

    • To develop a CMOS-compatible, all-optical modulator leveraging graphene's nonlinear properties and silicon photonics integration.
    • To design and analyze a novel graphene-on-silicon slot (GOSS) waveguide modulator for enhanced performance.

    Main Methods:

    • Theoretical calculation of graphene's nonlinear Kerr coefficient using the tight-binding model and semiconductor Bloch equations.
    • Design of a two-stage graphene-on-silicon double-slot (GOSDS) waveguide modulator to increase light-graphene interaction.
    • Simulation and analysis of modulation efficiency (ME), insertion loss (IL), and modulation depth (MD).

    Main Results:

    • The GOSDS waveguide modulator demonstrates a modulation efficiency of 0.241 dB/µm and a modulation depth of 77% at optical pump intensities of 9 MW/cm².
    • Achieved significantly shorter waveguide lengths and lower optical intensities compared to previous all-optical modulators.
    • The design shows a 17.6x reduction in waveguide length versus ribbon waveguide modulators and ≈0.043x optical intensity for phase shift compared to Mach-Zehnder modulators.

    Conclusions:

    • The proposed GOSDS waveguide modulator offers a high-performance, compact, and efficient solution for all-optical control on a chip.
    • This design integrates the benefits of graphene's nonlinearities with silicon photonics for advanced photonic integrated circuits.
    • The study paves the way for realizing wideband, all-optical communication systems with reasonable contrast levels.