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. 2019 Mar 11;9:4097. doi: 10.1038/s41598-019-40791-4

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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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Metamaterial structure and simulated electromagnetic properties at room temperature. (a) Schematic of the unit cell exhibiting asymmetric transmission of linearly polarized waves, with parameters g = 5 μm, w = 8 μm, l = 49 μm, d = 11 μm, h = 500 μm and P = 82 μm. (b) Co- and cross-polarized spectral response |T_xx|, |T_yx|, |T_xy|, and |T_yy| of the metamaterial, where T_ij represents the transmission coefficient describing i-polarized transmitted waves resulting from j-polarized illumination of the metamaterial’s front. (c) Asymmetric transmission for linearly and circularly polarized incident waves, where ‘−’ and ‘+’ correspond to left- and right-handed circularly polarized waves. (d) Polarization ellipse of the transmitted wave at 1.1 THz for x-polarized illumination of the metamaterial’s front.