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All-optical logic gates based on nonlinear plasmonic ring resonators.

Najmeh Nozhat, Nosrat Granpayeh

    Applied Optics
    |September 15, 2015
    PubMed
    Summary

    This study introduces a novel nonlinear plasmonic T-shaped switch for optical computing. The proposed device enables the creation of efficient AND, NOR, and NOT logic gates with high transmission values.

    Area of Science:

    • Photonics and optical engineering
    • Plasmonics
    • Nanotechnology

    Background:

    • Nonlinear optical devices are crucial for advanced optical information processing.
    • Plasmonic devices offer miniaturization and enhanced light-matter interactions.
    • T-shaped resonators provide a unique platform for optical switching applications.

    Purpose of the Study:

    • To design and simulate a nonlinear plasmonic T-shaped switch.
    • To propose and analyze optical logic gates (NOT, AND, NOR) based on this switch.
    • To demonstrate the performance of these logic gates using the nonlinear Kerr effect.

    Main Methods:

    • Finite-difference time-domain (FDTD) numerical simulation method.
    • Utilizing the nonlinear Kerr effect for optical switching.

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  • Designing a square-shaped ring resonator for the T-shaped switch.

    • Main Results:

    • Achieved high transmission values for the ON states of the logic gates (up to 90% for AND).
    • Demonstrated low transmission values for the OFF states (less than 0.6% for NOT/NOR).
    • Successfully proposed and simulated NOT, AND, and NOR optical logic gates.

    Conclusions:

    • The proposed nonlinear plasmonic T-shaped switch is a viable component for optical logic gates.
    • The device exhibits efficient switching characteristics suitable for optical computing.
    • This work contributes to the development of integrated photonic circuits for information processing.