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Updated: Apr 28, 2026

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Plasmon modes in single gold nanodiscs.

K Imura, K Ueno, H Misawa

    Optics Express
    |June 13, 2014
    PubMed
    Summary

    Researchers studied gold nanodiscs using scanning near-field optical microscopy. They found multiple plasmon resonances and complex spatial patterns, explained by fundamental plasmon modes within the nanodiscs.

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    Area of Science:

    • Plasmonics
    • Nanophotonics
    • Optical properties of nanomaterials

    Background:

    • Gold nanodiscs exhibit unique optical properties due to surface plasmon resonances.
    • Understanding the spatial distribution of these resonances is crucial for nanophotonic applications.

    Purpose of the Study:

    • To investigate the optical properties and spatial features of single gold nanodiscs.
    • To correlate observed near-field optical microscopy data with theoretical models of plasmon modes.

    Main Methods:

    • Scanning near-field optical microscopy (SNOM) was employed to measure transmission spectra and images.
    • Theoretical simulations were performed to model electromagnetic fundamental modes within the nanodiscs.
    • Spatial correlation analysis was used to link simulation results with experimental observations.

    Main Results:

    • Single gold nanodiscs showed multiple plasmon resonances across the visible to near-infrared spectrum.
    • Near-field transmission images displayed wavelength-dependent wavy spatial features.
    • Simulations successfully reproduced the observed spatial structures and attributed them to fundamental plasmon modes.

    Conclusions:

    • The study clarifies the origin of spatial features in near-field optical images of gold nanodiscs.
    • Fundamental plasmon modes are key to understanding the complex optical behavior of these nanostructures.
    • This work provides insights for designing nanophotonic devices utilizing tailored plasmon resonances.

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