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All-type optical logic gates using plasmonic coding metamaterials and multi-objective optimization.

Yihang Dan, Zeyang Fan, Xiaojuan Sun

    Optics Express
    |April 27, 2022
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    Summary

    We developed a compact multiport plasmonic system (MPS) using coding metamaterials to create all logic gates. This nanophotonic device enables efficient optical computing and signal processing applications.

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    Area of Science:

    • Nanophotonics
    • Metamaterials
    • Optical Computing

    Background:

    • Traditional plasmonic logic gates face limitations in programmability and footprint.
    • Metal-dielectric-metal (MDM) structures offer advanced electromagnetic wave manipulation.
    • Compact device integration is crucial for scalable optical processing.

    Purpose of the Study:

    • To propose a multiport plasmonic system (MPS) for implementing all types of logic gates.
    • To leverage coding metamaterials and inverse design for enhanced performance.
    • To demonstrate wavelength-tunable logic operations within a broad spectrum.

    Main Methods:

    • Utilized coding metamaterials based on MDM structures for programmability.
    • Employed the nondominated sorting genetic algorithm II (NSGA-II) for optimizing metamaterial distributions.
    • Conducted simulations to validate the functionality of all logic gates at 1.31 µm.

    Main Results:

    • Achieved all fundamental logic gate operations (AND, OR, NOT, NAND, NOR, XNOR, XOR) in a compact footprint (0.8 µm × 1.1 µm).
    • Demonstrated high extinction ratios, with the OR gate reaching 57.54 dB.
    • Confirmed wavelength-tunable logic operations across a wide spectral range.

    Conclusions:

    • The proposed MPS offers a universal scheme for compact, all-type logic gates for optical processing.
    • This work highlights the effective application of inverse design in nanophotonic device development.
    • The system paves the way for advanced integrated photonic circuits and optical computing.