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. 2019 Jul 19;10:3242. doi: 10.1038/s41467-019-11143-7

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© The Author(s) 2019

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. 3 — Leakage of the waveguiding HPhP mode below the Au rod into the HPhP M0 mode in the h-BN flake. a, b Spatial distribution of the z-component of the electric field in the z–x (a) and x–y (at the top surface of the h-BN slab) (b) planes, calculated at ω = 1520 cm⁻¹. The cross-section of the waveguide is that of the rod antennas. Scale bars, 0.5 μm in a and 1 μm in b