Plasmonic resonances in copper island films

Sancho-Parramon, Jordi; Okorn, Boris; Salamon, Krešimir; Janicki, Vesna (2019) Plasmonic resonances in copper island films. Applied Surface Science, 467 . pp. 847-853. ISSN 0169-4332

Preview

PDF - Accepted Version - article
Download (3MB) | Preview

Official URL: https://www.sciencedirect.com/science/article/abs/...

Abstract

The optical properties of Cu island films, in particular their plasmonic behaviour, are investigated. The films are fabricated by electron beam evaporation using different deposition parameters (deposited mass thickness and substrate temperature). The optical response can be tuned from a metal-like behaviour to well-defined localized surface plasmon resonances and is well correlated with the structural and morphological properties of the samples. Significant changes of optical properties take place with sample aging, including quenching and non-monotonic frequency shift of the plasmon resonance. These changes are interpreted in terms of Cu oxidization process, that appears to strongly depend on the initial morphology of samples. Theoretical calculations in the framework of effective medium theories qualitatively explain the experimental observations. Overall, the results give a detailed insight on the morphology dependence and time evolution of the optical response of Cu island films that may provide useful guidelines for applying these nanostructures in plasmonic applications.

Item Type:

Article

Additional Information:

This work was supported by the Ministry of Environment and Energy, the Ministry of Science and Education, the Environmental Protection and Energy Efficiency Fund and the Croatian Science Foundation under the project Plasmonic Alternative Materials for Solar Energy Conversion" (PKP-2016-06-4469) in the total amount of 1 074 000 HRK.

Uncontrolled Keywords:

copper metal island films ; localized surface plasmon resonance ; optical characterization ; ellipsometry ; copper oxide ; effective medium theory

Subjects:

NATURAL SCIENCES > Physics

Divisions:

Division of Materials Physics

Projects: