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

Autori
Mezzasalma, Stefano A. ; Janicki, Vesna ; Salamon, Krešimir ; Sancho-Parramon, Jordi ;

Izvornik
Physica status solidi-rapid research letters (1862-6254) 12 (2018), 9; 1800149, 6

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
electron damping ; multilayer ; Drude-Sommerfeld model ; ellipsometry ; dielectric function

Sažetak
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 (α). An application is developed for thin Cu/Au and Au/Ag films, showing an apparently irregular damping trend in the film thickness (d = 2.5–7.5 nm). The inferred ⟨γ⟩'s agree in both cases with our data when |α| = 0.01 ÷ 0.001 linearly increases with decreasing d, suggesting a coupling phenomenology that can bring new insights in the optics and plasmonics of nanostructures.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

POVEZANOST RADA