Skip to main content

Lund University Publications

LUND UNIVERSITY LIBRARIES

How Dark Are Radial Breathing Modes in Plasmonic Nanodisks?

Schmidt, Franz Philipp ; Losquin, Arthur LU ; Hofer, Ferdinand ; Hohenau, Andreas ; Krenn, Joachim R. and Kociak, Mathieu (2018) In ACS Photonics 5(3). p.861-866
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 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 corresponds 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... (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 corresponds 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.

(Less)
Please use this url to cite or link to this publication:
author
; ; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
cathodoluminescence, electron energy loss spectroscopy, nanoparticles, Plasmonics, transmission electron microscopy
in
ACS Photonics
volume
5
issue
3
pages
6 pages
publisher
The American Chemical Society (ACS)
external identifiers
  • scopus:85044333404
  • pmid:29607350
ISSN
2330-4022
DOI
10.1021/acsphotonics.7b01060
language
English
LU publication?
yes
id
c1e12df0-146c-449d-a1aa-6f245239a676
date added to LUP
2018-04-03 15:10:46
date last changed
2024-04-15 04:40:57
@article{c1e12df0-146c-449d-a1aa-6f245239a676,
  abstract     = {{<p>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 corresponds 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.</p>}},
  author       = {{Schmidt, Franz Philipp and Losquin, Arthur and Hofer, Ferdinand and Hohenau, Andreas and Krenn, Joachim R. and Kociak, Mathieu}},
  issn         = {{2330-4022}},
  keywords     = {{cathodoluminescence; electron energy loss spectroscopy; nanoparticles; Plasmonics; transmission electron microscopy}},
  language     = {{eng}},
  month        = {{03}},
  number       = {{3}},
  pages        = {{861--866}},
  publisher    = {{The American Chemical Society (ACS)}},
  series       = {{ACS Photonics}},
  title        = {{How Dark Are Radial Breathing Modes in Plasmonic Nanodisks?}},
  url          = {{http://dx.doi.org/10.1021/acsphotonics.7b01060}},
  doi          = {{10.1021/acsphotonics.7b01060}},
  volume       = {{5}},
  year         = {{2018}},
}