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. 2017 Oct 26;7:14147. doi: 10.1038/s41598-017-14493-8

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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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Geometry and working mechanism of the anomalous reflection metasurface. (a) Schematics of the designed unit cell. (b) The reflection phase at 1 THz as a function of b for terahertz wave incidence. (c) A super cell in the sample (region surrounded by dashed line) consists of 8 unit structures with top Au square patch-loop-structure. (d) Reflection phase of each unit structure within a super cell, with solid line representing relationship between phase and position. The dimension b of eight particular meta-particles are 10 μm, 25 μm, 31 μm, 35 μm, 38 μm, 43 μm, 49 μm, 56 μm, respectively.