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. 2017 Dec 1;7:16805. doi: 10.1038/s41598-017-17156-w

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© The Author(s) 2017

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Effective medium dielectric function for metal/dielectric interfaces composed by Al:ZnO/ZB-ZnS at different thickness ratios x = d _m/d _d between the two constituents (panel a), and for different doped dielectrics interfaced to ZB-ZnS at x = d _m/d _d = 1 (panel c); in (a) the curves for pure ZnS (x = 0) are included for comparison. Panel b highlights the different regions of the spectrum, and the corresponding average behavior of an Al:ZnO/ZB-ZnS bilayer with equal thicknesses (x = 1); a sketch of the structure is depicted in the lowest right part of the panel. The strong oscillations in ε _|| correspond to the onset of the surface plasmon polariton of the metallic layer and show marked dependence on the d _m/d _d ratio.