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. 2020 Jul 19;10(7):1411. doi: 10.3390/nano10071411

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© 2020 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Confinement (localization) lengths $δ_{m}$ and $δ_{d}$ of SPP wave in the (a) metal and (b) dielectric in the direction perpendicular to the interface. Dashed blue lines in figs (a) illustrate the optical skin depth $δ_{α}$ .