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Plasmonic spectral splitting in multi-resonator-coupled waveguide systems.

Chao Zeng

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    Summary
    This summary is machine-generated.

    This study numerically investigates spectral splitting in plasmonic waveguides with disk cavities. Cascading multiple cavities splits resonance spectra, enhancing quality factors for optical circuit applications.

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    Area of Science:

    • Photonics
    • Plasmonics
    • Optical Engineering

    Background:

    • Metal-insulator-metal (MIM) plasmonic waveguides offer unique light-matter interaction properties.
    • Electromagnetically induced transparency (EIT) is a quantum interference phenomenon with optical applications.
    • Spectral splitting is crucial for advanced optical signal processing.

    Purpose of the Study:

    • To numerically investigate spectral splitting in a novel MIM plasmonic waveguide system.
    • To explore the effect of coupled disk cavities on spectral properties.
    • To assess the potential of this system for integrated optical devices.

    Main Methods:

    • Numerical simulations using the finite-difference time-domain (FDTD) method.
    • Modeling of a MIM plasmonic waveguide coupled with a series of disk cavities.
    • Analysis of reflection spectra and quality factors.

    Main Results:

    • A resonance peak in the reflection dip, analogous to EIT, was observed in single-cavity coupled structures.
    • Cascading multiple disk cavities led to gradual splitting of resonance spectra due to phase-coupled effects.
    • Increasing the number of coupled cavities significantly improved the quality factors of the splitting spectra.

    Conclusions:

    • The proposed plasmonic waveguide system demonstrates effective spectral splitting.
    • The system shows potential for applications in multichannel filtering, all-optical switching, and slow-light devices.
    • This work advances the design of compact and efficient integrated optical circuits.