Numerical study of optical and EELS response of coupled metallic nanoparticles

Résultats de recherche: Contribution dans un livre/un catalogue/un rapport/dans les actes d'une conférenceContribution à un catalogue

Résumé

Localized surface plasmon resonances (LSPR) govern the optical properties of metallic nanoparticles at the nanoscale level and depend strongly on their shape, size and environment. When particles are a few nanometers apart, new plasmon modes, that can be either bright or dark, arise from the electromagnetic coupling of the plasmon modes of the individual nanoparticles. In the case of 3 gold nanorods assembled in a dolmen-like structure, a transmission window has been observed experimentally from 0.9 and 1.3 eV. It has been attributed to Fano interferences between a broad bright mode coming from the monomer and a narrow dark mode coming from the dimer. Because it is optically inactive, the latter has to be probed locally with an electron beam. This is why we investigate numerically the energy electron loss (EEL) response of coupled metallic nanorods together with their optical properties to get insight into the origin of these Fano resonances. To achieve this, calculations are performed in the frame of the discrete dipole approximation both for optical and EEL excitations.
langue originaleAnglais
titreProceedings of SPIE - The International Society for Optical Engineering
Volume8096
Les DOIs
étatPublié - 1 janv. 2011

Empreinte digitale

nanoparticles
nanorods
electron energy
optical properties
electromagnetic coupling
surface plasmon resonance
monomers
dimers
electron beams
gold
dipoles
interference
approximation
excitation

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Guillaume, Stéphane-Olivier ; Geuquet, N. ; Henrard, L. / Numerical study of optical and EELS response of coupled metallic nanoparticles. Proceedings of SPIE - The International Society for Optical Engineering. Vol 8096 2011.
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Numerical study of optical and EELS response of coupled metallic nanoparticles. / Guillaume, Stéphane-Olivier; Geuquet, N.; Henrard, L.

Proceedings of SPIE - The International Society for Optical Engineering. Vol 8096 2011.

Résultats de recherche: Contribution dans un livre/un catalogue/un rapport/dans les actes d'une conférenceContribution à un catalogue

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AU - Guillaume, Stéphane-Olivier

AU - Geuquet, N.

AU - Henrard, L.

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AB - Localized surface plasmon resonances (LSPR) govern the optical properties of metallic nanoparticles at the nanoscale level and depend strongly on their shape, size and environment. When particles are a few nanometers apart, new plasmon modes, that can be either bright or dark, arise from the electromagnetic coupling of the plasmon modes of the individual nanoparticles. In the case of 3 gold nanorods assembled in a dolmen-like structure, a transmission window has been observed experimentally from 0.9 and 1.3 eV. It has been attributed to Fano interferences between a broad bright mode coming from the monomer and a narrow dark mode coming from the dimer. Because it is optically inactive, the latter has to be probed locally with an electron beam. This is why we investigate numerically the energy electron loss (EEL) response of coupled metallic nanorods together with their optical properties to get insight into the origin of these Fano resonances. To achieve this, calculations are performed in the frame of the discrete dipole approximation both for optical and EEL excitations.

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