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. 2019 May 30;9:8058. doi: 10.1038/s41598-019-44644-y

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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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Sketch and numerical analysis of the fiber tip sensor. (a) Rendered image of the PCS attached to the fiber extremity (top) Geometry of the photonic crystal (bottom). (b) Transmission and reflection spectra for both 1SBM and 2SBM operating structures. (c,d) Computed reflection spectra in function of the air/gap length between the fiber section and the PCS for both (c) 2SBM and (d) 1SBM. In the inset, its respective electric field distributions. (e,f) Tolerance analysis to (e) the unacuraccy on the parallelism between the fiber section and the PCS and (f) the miss-centering error.