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Combination Law for Drude–Sommerfeld's Electron Damping in Multilayer Thin Metal Films

Mezzasalma, Stefano / A.; Janicki, Vesna; Salamon, Krešimir; Parramon, Jordi Sancho (2018) Combination Law for Drude–Sommerfeld's Electron Damping in Multilayer Thin Metal Films. physica status solidi (RRL) - Rapid Research Letters, 12 . p. 1800149. ISSN 1862-6254

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Abstract

A combination rule for electron damping in multilayer thin metal films is derived from a mean‐field picture and is applied to optical experimental data. The overall coefficient obeys a parallel law of pure materials damping, chemical specificity being involved by averaging over densities of low energy states in the free electron model. Geometric and static electromagnetic features of single layers couple via small Fermi's energy fractions (αi). An application is developed for thin Cu/Au and Au/Ag films, showing an apparently irregular damping trend in the film thickness (di = 2.5–7.5 nm). The inferred ⟨γ⟩'s agree in both cases with our data when |αi| = 10−2 ÷ 10−3 linearly increases with decreasing di, suggesting a coupling phenomenology that can bring new insights in the optics and plasmonics of nanostructures.

Item Type: Article
Additional Information: This work was supported by the Ministry of Environment and Energy of Croatia, the Ministry of Science and Education of Croatia, 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. One of the authors (S.A.M.) wishes to remember Giampiero Bof (1934-2017).
Uncontrolled Keywords: Au/Ag multilayers; Cu/Au multilayers; Drude–Sommerfeld model; electron damping; optical response; thin metal films
Subjects: NATURAL SCIENCES
NATURAL SCIENCES > Physics
NATURAL SCIENCES > Physics > Condensed Matter Physics
Divisions: Division of Materials Physics
Projects:
Project titleProject leaderProject codeProject type
Plazmonički alternativni materijali za konverziju solarne energije-PAMSECJordi Sancho-ParramonPKP-2016-06-4469HRZZ
Depositing User: Stefano Mezzasalma
Date Deposited: 29 Apr 2020 10:46
Last Modified: 29 Apr 2020 10:46
URI: http://fulir.irb.hr/id/eprint/5437
DOI: 10.1002/pssr.201800149

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