How Dark Are Radial Breathing Modes in Plasmonic Nanodisks?
SCHMIDT, Franz-Philipp
Institute of Physics [Graz]
Institute for Electron Microscopy and Nanoanalysis [Graz] [IEMN]
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Institute of Physics [Graz]
Institute for Electron Microscopy and Nanoanalysis [Graz] [IEMN]
SCHMIDT, Franz-Philipp
Institute of Physics [Graz]
Institute for Electron Microscopy and Nanoanalysis [Graz] [IEMN]
< Reduce
Institute of Physics [Graz]
Institute for Electron Microscopy and Nanoanalysis [Graz] [IEMN]
Language
en
Article de revue
This item was published in
ACS photonics. 2018, vol. 5, n° 3, p. 861-866
American Chemical Society
English Abstract
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 ...Read more >
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.Read less <
English Keywords
plasmonics
electron energy loss spectroscopy
cathodoluminescence
transmission electron microscopy
nanoparticles
European Project
Enabling Science and Technology through European Electron Microscopy
Origin
Hal imported