Tailoring plasmonic resonances in Cu-Ag metal islands films
| Autor: | Stefano A. Mezzasalma, Vesna Janicki, Matej Bubaš, Maria Chiara Spadaro, Jordi Sancho-Parramon, Jordi Arbiol |
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| Přispěvatelé: | Croatian Science Foundation, Generalitat de Catalunya, Ministerio de Economía y Competitividad (España), European Commission |
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Surface plasmon resonance
Metal islands films Ellipsometry Optical properties Dewetting Electron microscopy Janus nanoparticles Materials science Annealing (metallurgy) General Physics and Astronomy Physics::Optics 02 engineering and technology Island growth 010402 general chemistry 01 natural sciences Condensed Matter::Materials Science Atomic and Molecular Physics Plasmon Percolation threshold Surfaces and Interfaces General Chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics Evaporation (deposition) 0104 chemical sciences Surfaces Coatings and Films Chemical physics 0210 nano-technology |
| Zdroj: | Applied Surface Science Digital.CSIC. Repositorio Institucional del CSIC instname |
| DOI: | 10.1016/j.apsusc.2021.150260 |
| Popis: | 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. The authors thank the financial support of the Croatian Science Foundation through the Grant No. IP-2019-04-5424. M. C. Spadaro and J. Arbiol acknowledge funding from Generalitat de Catalunya 2017 SGR 327. ICN2 is supported by the Severo Ochoa program from Spanish MINECO (Grant No. SEV-2017-0706) and is funded by the CERCA Programme/ Generalitat de Catalunya. M.C.S. has received funding from the European Union’s Horizon 2020 research and innovation programme under the Marie Skłodowska-Curie grant agreement No. 754510 (PROBIST) and the Severo Ochoa programme. Authors acknowledge F.J. Belarre for the TEM sample preparation. |
| Databáze: | OpenAIRE |
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