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Ultraviolet–visible (UV–visible or UV–Vis) spectroscopy is an analytical technique that investigates the interaction between matter and UV–Vis light within the electromagnetic spectrum. This method is widely used for its versatility, simplicity, and relatively quick data acquisition, making it valuable for both qualitative and quantitative analysis. When UV–Vis radiation passes through a material,  molecules absorb light depending on the energy required for...
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Determination of the Excitation and Coupling Rates Between Light Emitters and Surface Plasmon Polaritons
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Critically coupled high-Q plasmonic guided mode resonances in the visible.

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    This study introduces a novel plasmonic metasurface using silver nanoparticles and long-range surface-plasmon polaritons (LRSPPs) to achieve high-quality factor resonances. This breakthrough enhances light-matter interactions for applications like sensing and enhanced light emission.

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    Area of Science:

    • Plasmonics and Nanophotonics
    • Materials Science and Engineering

    Background:

    • High-quality factor (Q factor) plasmonic resonances are crucial for light-matter interactions but are often limited by metal absorptive losses.
    • Achieving narrow linewidths and high coupling efficiency simultaneously in plasmonic metasurfaces remains a significant challenge.

    Purpose of the Study:

    • To demonstrate a novel plasmonic metasurface design that overcomes intrinsic loss limitations in the visible spectrum.
    • To achieve critical coupling between long-range surface-plasmon polaritons (LRSPPs) and guided-mode resonances (GMRs) for enhanced light-matter interactions.

    Main Methods:

    • Fabrication of an ultrathin silver film supporting LRSPPs coupled to a square lattice of Ag nanoparticles.
    • Utilized coupled-mode theory and coupled-dipole simulations to analyze resonance behavior and loss mechanisms.
    • Investigated the suppression of radiative leakage and resistive dissipation.

    Main Results:

    • Achieved a collective LRSPP-GMR with a Q factor of 361 and 99.8% coupling efficiency at 633 nm.
    • Demonstrated tunable resonances with Q factors >100 across the visible spectrum (down to 558 nm).
    • Obtained an optimized Purcell factor of ~5x10^21 m^-3, twice that of uncoupled SPP GMRs, indicating superior light-matter interaction enhancement.

    Conclusions:

    • The developed LRSPP-GMR metasurface reconciles loss channels, enabling ultranarrow and efficiently excited plasmonic resonances.
    • This platform offers a straightforward route for applications requiring enhanced light-matter interactions, such as SERS, nonlinear optics, and sensing.
    • The findings provide a new paradigm for designing high-performance plasmonic devices.