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

Résultats de recherche: Contribution à un journal/une revueArticle

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Résumé

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.
langue originaleAnglais
Pages (de - à)1288-1294
Nombre de pages7
journalNano Letters
Volume12
Numéro de publication3
Les DOIs
étatPublié - 14 mars 2012

Empreinte digitale

Plasmons
plasmons
Silver
silver
Nanoparticles
nanoparticles
Electron energy loss spectroscopy
energy
Electron microscopes
electron microscopes
spatial resolution
energy dissipation
electron energy
dipoles
Scanning
scanning
Computer simulation
Substrates
approximation
spectroscopy

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Mazzucco, S. ; Stéphan, O. ; Kociak, M. ; Geuquet, N. ; Henrard, L. ; Ye, J. ; Van Roy, W. ; Van Dorpe, P. / Ultralocal modification of surface plasmons properties in silver nanocubes. Dans: Nano Letters. 2012 ; Vol 12, Numéro 3. p. 1288-1294.
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abstract = "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.",
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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, VOL. 12, Numéro 3, p. 1288-1294. https://doi.org/10.1021/nl2037672

Ultralocal modification of surface plasmons properties in silver nanocubes. / Mazzucco, S.; Stéphan, O.; Kociak, M.; Geuquet, N.; Henrard, L.; Ye, J.; Van Roy, W.; Van Dorpe, P.

Dans: Nano Letters, Vol 12, Numéro 3, 14.03.2012, p. 1288-1294.

Résultats de recherche: Contribution à un journal/une revueArticle

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AU - Mazzucco, S.

AU - Stéphan, O.

AU - Kociak, M.

AU - Geuquet, N.

AU - Henrard, L.

AU - Ye, J.

AU - Van Roy, W.

AU - Van Dorpe, P.

N1 - Copyright 2012 Elsevier B.V., All rights reserved.

PY - 2012/3/14

Y1 - 2012/3/14

N2 - 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.

AB - 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.

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