Ultralocal modification of surface plasmons properties in silver nanocubes

S. Mazzucco, O. Stéphan, M. Kociak, N. Geuquet, L. Henrard, J. Ye, W. Van Roy, P. Van Dorpe

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    The plasmonic properties of individual subwavelength-sized silver nanocubes are mapped with nanometric spatial resolution by means of electron energy-loss spectroscopy in a scanning transmission electron microscope. Three main features with different energies and spatial behavior (two peaked at the corners, one on the edges) are identified and related to previous measurements on ensemble or individual nanoparticles. The highly subwavelength mapping of the energy position and intensity of the excitations shows that the surface plasmon modes, localized at specific areas of the particles, for example, the corners or the edges, are modified by their size, the presence of a substrate, and the very local environment. Helped by discrete dipole approximation numerical simulations, we discuss how local modifications of the environment affect the global modes of the particles. In particular, we show both experimentally and theoretically that absorption resonances at different corners of the same nanocube are largely independent of each other in energy and intensity. Our findings provide a better understanding of the spatial coherence of the surface plasmons in nanoparticles but also give useful insights about their roles in the nanoparticle sensing properties.
    Original languageEnglish
    Pages (from-to)1288-1294
    Number of pages7
    JournalNano Letters
    Issue number3
    Publication statusPublished - 14 Mar 2012

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    Cite this

    Mazzucco, S., Stéphan, O., Kociak, M., Geuquet, N., Henrard, L., Ye, J., Van Roy, W., & Van Dorpe, P. (2012). Ultralocal modification of surface plasmons properties in silver nanocubes. Nano Letters, 12(3), 1288-1294. https://doi.org/10.1021/nl2037672