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. 2020 Dec 3;15:223. doi: 10.1186/s11671-020-03454-2

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© The Author(s) 2020

Open AccessThis 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 licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence 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 licence, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 2 — a THz wave absorption of periodic split-ring structures with different opening widths (s). The split-rings have an outer radius of 15 μm, an inner radius of 10 μm and a thickness of 10 nm. b THz wave absorption of periodic split-ring structures with different ring widths (d). The split-rings have an outer radius of 15 μm, an opening width of 2 μm and a thickness of 10 nm