Tailoring plasmonic resonances in Cu-Ag metal islands films
(2021) In Applied Surface Science 564.- Abstract
The plasmonic response of Cu-Ag metal islands films is investigated. Films are obtained by subsequent electron beam deposition of Ag and Cu using different fabrication conditions: deposited mass thickness, substrate temperature and post-deposition annealing in vacuum. Optical properties of films are investigated by spectroscopic ellipsometry and correlated with the structural characterization results obtained by electron microscopy. It is observed that Ag enhances island growth and increases the percolation threshold of Cu films. The localized surface plasmon resonance of isolated particles shows signatures of both Cu and Ag. Moderate thermal annealing enhances island growth and favours Janus-like morphology, increasing the Ag... (More)
The plasmonic response of Cu-Ag metal islands films is investigated. Films are obtained by subsequent electron beam deposition of Ag and Cu using different fabrication conditions: deposited mass thickness, substrate temperature and post-deposition annealing in vacuum. Optical properties of films are investigated by spectroscopic ellipsometry and correlated with the structural characterization results obtained by electron microscopy. It is observed that Ag enhances island growth and increases the percolation threshold of Cu films. The localized surface plasmon resonance of isolated particles shows signatures of both Cu and Ag. Moderate thermal annealing enhances island growth and favours Janus-like morphology, increasing the Ag contribution to the surface plasmon resonance. In case of percolated films, annealing-induced dewetting can lead to the appearance of large and irregular particles with a remarkable absorption peak in the near-infrared range. Composition and optical properties of the films can be further modified by Ag partial evaporation upon annealing at high temperatures. The variation of optical properties with aging is related to Cu oxidization and follows different trends depending on the sample morphology. Overall, it is shown that Cu-Ag island films are compelling systems for plasmonic applications, as their optical response can be widely and easily tuned by adjusting fabrication conditions.
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- author
- Bubaš, Matej ; Janicki, Vesna ; Mezzasalma, Stefano A. ; Spadaro, Maria Chiara ; Arbiol, Jordi and Sancho-Parramon, Jordi
- publishing date
- 2021-10-30
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- Dewetting, Electron microscopy, Ellipsometry, Janus nanoparticles, Metal islands films, Optical properties, Surface plasmon resonance
- in
- Applied Surface Science
- volume
- 564
- article number
- 150260
- publisher
- Elsevier
- external identifiers
-
- scopus:85108810522
- ISSN
- 0169-4332
- DOI
- 10.1016/j.apsusc.2021.150260
- language
- English
- LU publication?
- no
- id
- 5ec823bd-2a4a-401a-a874-859682e66472
- date added to LUP
- 2021-08-16 10:31:30
- date last changed
- 2022-04-27 03:09:32
@article{5ec823bd-2a4a-401a-a874-859682e66472,
abstract = {{<p>The plasmonic response of Cu-Ag metal islands films is investigated. Films are obtained by subsequent electron beam deposition of Ag and Cu using different fabrication conditions: deposited mass thickness, substrate temperature and post-deposition annealing in vacuum. Optical properties of films are investigated by spectroscopic ellipsometry and correlated with the structural characterization results obtained by electron microscopy. It is observed that Ag enhances island growth and increases the percolation threshold of Cu films. The localized surface plasmon resonance of isolated particles shows signatures of both Cu and Ag. Moderate thermal annealing enhances island growth and favours Janus-like morphology, increasing the Ag contribution to the surface plasmon resonance. In case of percolated films, annealing-induced dewetting can lead to the appearance of large and irregular particles with a remarkable absorption peak in the near-infrared range. Composition and optical properties of the films can be further modified by Ag partial evaporation upon annealing at high temperatures. The variation of optical properties with aging is related to Cu oxidization and follows different trends depending on the sample morphology. Overall, it is shown that Cu-Ag island films are compelling systems for plasmonic applications, as their optical response can be widely and easily tuned by adjusting fabrication conditions.</p>}},
author = {{Bubaš, Matej and Janicki, Vesna and Mezzasalma, Stefano A. and Spadaro, Maria Chiara and Arbiol, Jordi and Sancho-Parramon, Jordi}},
issn = {{0169-4332}},
keywords = {{Dewetting; Electron microscopy; Ellipsometry; Janus nanoparticles; Metal islands films; Optical properties; Surface plasmon resonance}},
language = {{eng}},
month = {{10}},
publisher = {{Elsevier}},
series = {{Applied Surface Science}},
title = {{Tailoring plasmonic resonances in Cu-Ag metal islands films}},
url = {{http://dx.doi.org/10.1016/j.apsusc.2021.150260}},
doi = {{10.1016/j.apsusc.2021.150260}},
volume = {{564}},
year = {{2021}},
}