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    This study introduces a novel plasmonic disk resonator with a nanoslot for enhanced light-matter interactions. This design creates accessible external hotspots, significantly boosting biosensing and spontaneous emission control applications.

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    Area of Science:

    • Plasmonics
    • Nanophotonics
    • Electromagnetics

    Background:

    • Film-coupled plasmonic resonators utilize gap surface plasmons (GSPs) at metal-insulator-metal interfaces for light enhancement.
    • Spatial overlap of target molecules with plasmonic hotspots is crucial for biosensing and spontaneous emission control.

    Purpose of the Study:

    • To propose and investigate a GSP disk resonator with a nanoslot for controllable external light enhancement.
    • To enable efficient biosensing and spontaneous emission control through accessible plasmonic hotspots.

    Main Methods:

    • Utilizing finite element method (FEM) simulations to model the plasmonic resonator.
    • Designing a GSP disk resonator with a nanoslot oriented perpendicular to the incident field polarization.
    • Tailoring resonant modes of GSP and nanoslot for optimized field distribution.

    Main Results:

    • Simultaneous excitation of electric-dipole modes (nanoslot) and GSP modes.
    • Over two orders of magnitude increase in total electromagnetic energy.
    • Nearly three orders of magnitude enhancement in radiative decay rate due to external hotspot interaction.

    Conclusions:

    • The proposed GSP disk resonator with a nanoslot offers controllable external electromagnetic hotspots.
    • This configuration provides enhanced light-matter interaction for biosensing and spontaneous emission control.
    • The design expands design freedom for creating external electromagnetic hotspots.