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    We developed a novel multilogic gate (MLG) using dielectric-loaded graphene-based plasmonic waveguides (DLGPW) for mid-infrared applications. This compact, CMOS-compatible device performs AND, XNOR, and NOR logic operations with high extinction ratios.

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    Area of Science:

    • Photonics and Optoelectronics
    • Nanotechnology
    • Integrated Optics

    Background:

    • Graphene-based plasmonic waveguides offer unique optical properties for advanced photonic devices.
    • Existing electro-optical logic gates often face limitations in terms of integration and performance.
    • Mid-infrared (MIR) spectral region presents opportunities for novel applications in sensing and communication.

    Purpose of the Study:

    • To propose and investigate a novel multilogic gate (MLG) utilizing dielectric-loaded graphene-based plasmonic waveguides (DLGPW).
    • To demonstrate simultaneous AND, XNOR, and NOR logic operations within a single device.
    • To explore the potential of DLGPWs for compact and efficient electro-optical logic in the MIR region.

    Main Methods:

    • Design and simulation of a graphene plasmonic on-off switch by controlling graphene surface conductivity.
    • Development of a 3 dB multimode interference (MMI) splitter based on DLGPW at a wavelength of 7.8 μm.
    • Integration of switches and MMI splitters to form the proposed MLG structure.

    Main Results:

    • The proposed MLG successfully supports simultaneous AND, XNOR, and NOR logic operations.
    • Calculated minimum extinction ratios (ER) achieved: 17.53 dB (AND), 53.43 dB (XNOR), and 17.53 dB (NOR).
    • The structure can be modified to function as a NAND gate with an ER of 55.22 dB.

    Conclusions:

    • The developed DLGPW-based MLG is a novel electro-optical logic gate for the MIR spectral region.
    • The device exhibits a compact footprint, high extinction ratios, and CMOS compatibility, facilitating on-chip implementation.
    • This work opens new avenues for integrated photonic circuits utilizing graphene in the mid-infrared spectrum.