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. 2018 Aug 23;8:12701. doi: 10.1038/s41598-018-31062-9

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© The Author(s) 2018

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) The variation of micro-tip coupled light at different offset positions for different distance between micro-tip and SMF end; (b) simulated output electric field at SMF end with distance from the center of the SMF core; and inset of (b) shows the simulated mode profile of the standard SMF.