How Dark Are Radial Breathing Modes in Plasmonic Nanodisks?
(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.
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- author
- Schmidt, Franz Philipp ; Losquin, Arthur LU ; Hofer, Ferdinand ; Hohenau, Andreas ; Krenn, Joachim R. and Kociak, Mathieu
- organization
- publishing date
- 2018-03-21
- 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
- 2024-08-19 15:56:09
@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}}, }