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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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Active performance of the THz metamaterial consisting of an array of SRRs with VO₂ loaded in their gaps. (a) Simulated transmission spectra for a series of VO₂ conductivity (σ₁) values. (b) A semi-log two-dimensional plot of the transmission spectra. (c) The electric field distribution for the first resonance at 0.74 THz when σ₁ = 10 Ω⁻¹ cm⁻¹ and the second resonance at 1.74 THz when σ₁ = 2000 Ω⁻¹ cm⁻¹. (d) The in-gap electric field enhancement as a function of σ₁ at 0.74 THz. The field enhancement at 1.74 THz is shown in the inset. All data for |E| was normalized to the electric field magnitude of the incident wave.