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Plasmonic structure: toward multifunctional optical device with controllability.

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    A novel compact photonic device with a rotatable core enables multiple functions like filtering and switching. This plasmonic component offers tunable wavelengths and signal control for advanced optical networks-on-chips.

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    Area of Science:

    • Photonics
    • Plasmonics
    • Optical Engineering

    Background:

    • Multifunctional plasmonic components are crucial for flexible photonic integrated circuits.
    • Achieving versatile optical devices with tunable functionalities is a key challenge in integrated photonics.

    Purpose of the Study:

    • To present a compact, multifunctional photonic device capable of transforming between various optical functions.
    • To demonstrate signal controllability through the rotation of an embedded elliptical core within a resonator.

    Main Methods:

    • Utilized temporal coupled-mode theory and the finite-difference time-domain (FDTD) method for analysis.
    • Designed a resonator structure with a rotatable elliptical core coupled to three waveguides.

    Main Results:

    • The rotation of the elliptical core effectively manipulates field distribution and alters resonance modes.
    • Achieved switchable operating wavelengths tunable by adjusting structural parameters.
    • Demonstrated multifunctional capabilities including power splitting, filtering, demultiplexing, and switching with controllable parameters.

    Conclusions:

    • The proposed rotatable elliptical core device offers significant signal controllability for photonic integrated circuits.
    • This multifunctional plasmonic device is highly relevant for the development of optical networks-on-chips.
    • Investigated fabrication tolerances, indicating practical feasibility for waveguide width and coupling distance.