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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. 6 — THz wave absorption of periodic structures of a combination of two split-rings and an Al disk with different incident angles. The two split-rings have a ring width of 2 μm, an opening width of 2 μm and an outer radius of 17 μm and 13 μm, respectively. The Al disk has a radius of 9 μm and a thickness of 10 nm