SCHMIDT, Franz-Philipp; LOSQUIN, Arthur; HOFER, Ferdinand; HOHENAU, Andreas; KRENN, Joachim; KOCIAK, Mathieu

doi:10.1021/acsphotonics.7b01060

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SCHMIDT, Franz-Philipp
Institute of Physics [Graz]
Institute for Electron Microscopy and Nanoanalysis [Graz] [IEMN]

LOSQUIN, Arthur
Laboratoire Ondes et Matière d'Aquitaine [LOMA]
Skane University Hospital [Lund]

HOFER, Ferdinand
Institute for Electron Microscopy and Nanoanalysis [Graz] [IEMN]

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Article de revue

Ce document a été publié dans

ACS photonics. 2018, vol. 5, n° 3, p. 861-866

American Chemical Society

Résumé en anglais

Due to a vanishing dipole moment, radial breathing modes in small flat plasmonic nanoparticles do not couple to light and have to be probed with a near field source, as in electron energy loss spectroscopy (EELS). With increasing particle size, retardation gives rise to light coupling, enabling probing breathing modes optically or by cathodoluminescence (CL). Here, we investigate single silver nanodisks with diameters of 150−500 nm by EELS and CL in an electron microscope and quantify the EELS/CL ratio, which corre sponds to the ratio of full to radiative damping of the breathing mode. For the investigated diameter range, we find the CL signal to increase by about 1 order of magnitude, in agreement with numerical simulations. Due to reciprocity, our findings corroborate former optical experiments and enable a quantitative understanding of the light coupling of dark plasmonic modes.< Réduire

Mots clés en anglais

plasmonics

electron energy loss spectroscopy

cathodoluminescence

transmission electron microscopy

nanoparticles

DOI

http://dx.doi.org/10.1021/acsphotonics.7b01060

Projet Européen

Enabling Science and Technology through European Electron Microscopy

Origine

Importé de hal

Unités de recherche

Laboratoire Ondes et Matière d'Aquitaine (LOMA) - UMR 5798