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. 2017 Aug 10;7:7742. doi: 10.1038/s41598-017-08171-y

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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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A circularly polarized source will excite one guided mode with a specific propagating direction. (a) The sample is similar to that in Fig. 4. However, the source is equivalent to a circularly polarized one which is constituted by four linearly polarized sources (marked by the four red points) with 90 degree phase difference. (b,c) The simulated and the measured normalized |H_z| patterns for the clockwise-rotating source, respectively. (d,e) The source is changed to the anticlockwise-rotating source. (f) The normalized simulated values of |H_z| (the solid lines) along the x direction of ENG/MNG interface. The clockwise-rotating source (CRS) only excites the guided mode propagating from right to left. On the contrary, the anticlockwise-rotating source (ACRS) only excites the guided mode propagating from left to right. (g) The normalized measured values of |H_z| in the same region which are shown by the dashed lines.