Gold Nanocylinders on Gold Film as a Multi-spectral SERS Substrate.
SERS
multi-spectral substrate
optimization
plasmon
Journal
Nanomaterials (Basel, Switzerland)
ISSN: 2079-4991
Titre abrégé: Nanomaterials (Basel)
Pays: Switzerland
ID NLM: 101610216
Informations de publication
Date de publication:
11 May 2020
11 May 2020
Historique:
received:
07
04
2020
revised:
22
04
2020
accepted:
24
04
2020
entrez:
15
5
2020
pubmed:
15
5
2020
medline:
15
5
2020
Statut:
epublish
Résumé
The surface enhanced Raman scattering (SERS) efficiency of gold nanocylinders deposited on gold thin film is studied. Exploiting the specific plasmonic properties of such substrates, we determine the influence of the nanocylinder diameter and the film thickness on the SERS signal at three different excitation wavelengths (532, 638 and 785 nm). We demonstrate that the highest signal is reached for the highest diameter of 250 nm due to coupling between the nanocylinders and for the lowest thickness (20 nm) as the excited plasmon is created at the interface between the gold and glass substrate. Moreover, even if we show that the highest SERS efficiency is obtained for an excitation wavelength of 638 nm, a large SERS signal can be obtained at all excitation wavelengths and on a wide spectral range. We demonstrate that it can be related with the nature of the plasmon (propagative plasmon excited through the nanocylinder grating) and with its angular dependence (tuning of the plasmon position with the excitation angle). Such an effect allows the excitation of plasmon on nearly the whole visible range, and paves the way to multispectral SERS substrates.
Identifiants
pubmed: 32403295
pii: nano10050927
doi: 10.3390/nano10050927
pmc: PMC7279415
pii:
doi:
Types de publication
Journal Article
Langues
eng
Subventions
Organisme : Agence Nationale de la Recherche
ID : ANR-15-CE29-0026
Déclaration de conflit d'intérêts
The authors declare no conflict of interest.
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