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. 2016 Dec 12;6:38924. doi: 10.1038/srep38924

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Copyright © 2016, The Author(s)

This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

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Energy density distribution in (a) linear regime, P₀ = 0.01 mW. (b) Nonlinear regime, P₀ = 2.9 mW. The wave is launched in the left GNW. Bottom left corner of panel (a) shows cross-section of the pair of waveguides with dashed line indicating the plane on which we plot the spatial distribution of energy density.