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. 2019 Apr 2;9:5463. doi: 10.1038/s41598-019-41806-w

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© The Author(s) 2019

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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Sketch of the Salisbury screen realized by sandwiching the glass spacer between the electrochemical capacitor and the (a) graphene-based and (b) metallic mirrors, respectively. In both configurations the spacer thickness d is equal to 3.8 mm in analogy to what has been done in ref.¹³. (c,d) Theoretical and (e,f) experimental absorption maps for (c–e) G-mirror and (d–f) M-mirror. (g,h) Absorption versus gate voltage V_g for three maxima (I - first at 7.84 GHz, II - second at 7.97 GHz and III -third at 8.11 GHz). The blue line corresponds to the numerical absorption at 7.97 GHz. Inset (g) picture of the transparent absorber based on the Salisbury screen configuration.