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. 2018 May 22;9:2019. doi: 10.1038/s41467-018-04429-9

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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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Fig. 3 — Determination of the refractive index for N = 6. a Angular and b side-view of the examined flake taken under SEM. c Reflection spectrum and d several possible n′(λ) curves obtained using different m₀ values, with the correct n′(λ) curve shown in red. The cyan dot denotes the refractive index at the absorption onset wavelength determined from a separate step