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. 2017 Jun 28;7:4326. doi: 10.1038/s41598-017-04692-8

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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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VO₂ based tunable THz metamaterial absorber. Simulated (a) absorption spectra of the hybrid metamaterial and (b) the absorption in the VO₂ and gold material. (c) Transmittance (T) and reflectance (R) of the hybrid metamaterial and a bare 3-μm-thick VO₂ film on a substrate at the resonance frequency (0.82 THz) and two more frequencies far from the resonance (0.40 and 1.20 THz). (d) Schematic of the metamaterial absorber unit cell. A vector plot of electric current density on the surface of (e) the gold cross and (f) the VO₂ film. (g) Distribution of the x-component of the normalized magnetic field (|H_x|) in the spacer.