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. 2017 Jul 3;7:4506. doi: 10.1038/s41598-017-04881-5

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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–c) SF nanofiber configurations for the FEM quasi-mode analysis. Histograms of the angular distribution of the SF nanofibers are presented in the insets of (a–c). (d–f) Quality factors as a function of wavelengths for the three cases. Solid lines denote the Q _AVE. (g–i) Amplitudes and spatial distributions of the electric fields corresponding to the three modes with the highest Q factors. These modes are indicated by the red, green and blue dots in (d–f), respectively.