Effective optical constants of silver nanofilms calculated in wide frequency range

Kseniya M. Tsysar; Valery G. Andreev; Vladimir A. Vdovin

doi:10.1117/12.2267083

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30 December 2016 Effective optical constants of silver nanofilms calculated in wide frequency range

Kseniya M. Tsysar, Valery G. Andreev, Vladimir A. Vdovin

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Proceedings Volume 10224, International Conference on Micro- and Nano-Electronics 2016; 1022408 (2016) https://doi.org/10.1117/12.2267083
Event: The International Conference on Micro- and Nano-Electronics 2016, 2016, Zvenigorod, Russian Federation

Abstract

The optical properties of Ag ultrathin films in dependence of their thickness are studied theoretically in a wavelength range 0.3 - 10 μm. The extinction coefficient (k) and refractive index (n) for thin Ag films with smooth surface structure are calculated with software package VASP. It was found the effect of growth of extinction coefficient and shift of its peak into long wavelength range with the thickness increasing. The effect is explained by the significant increasing of the surface electron states. Refractive index n is increased with the wavelength growth and attains saturation value n_s at the wavelength λ_s. The thicker the films the higher the magnitude of n_s and the larger the wavelength λ_s. Our results of calculations of k(λ) are in a good agreement with experimental data from ref.[25]. The difference in magnitudes of n obtained experimentally and theoretically can be explained by the formation of Ag nanoclusters on the surface of sputtered film.

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Kseniya M. Tsysar, Valery G. Andreev, and Vladimir A. Vdovin "Effective optical constants of silver nanofilms calculated in wide frequency range", Proc. SPIE 10224, International Conference on Micro- and Nano-Electronics 2016, 1022408 (30 December 2016); https://doi.org/10.1117/12.2267083

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