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. 2017 Aug 25;8:356. doi: 10.1038/s41467-017-00391-0

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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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Fig. 6 — A right-angle dielectric rod waveguide bend with a single-layer metasurface coating. a Configuration of the right-angle Teflon rod waveguide bend coated by the metasurface guiding layer with an inhomogeneous distribution of unit cells in the bending section. The inset shows the enlarged view of the bending section, with the 5 types of unit cells labeled out. b Simulated dispersion curves for the five types of unit cells before and after “dispersion matching”. The dimensions for unit cells in progressive order from type “1” to type “5” are: p = 14, 14.3, 15, 15.7, 16 mm, q = 7.05, 6.75, 6.5, 6.2, 6 mm, and s = 0.35, 0.37, 0.5, 0.7, 0.75 mm. Snapshots of the electric field distribution of a bare and the coated Teflon rod waveguide bending in the c electric and d magnetic field plane. The simulated transmission between the transmitting and receiving probes for the bare and coated Teflon rod waveguide bending in the e electric and f magnetic field plane, as well as for the straight coated Teflon rod waveguide