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. 2021 Jun 18;12:3733. doi: 10.1038/s41467-021-23436-x

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© The Author(s) 2021

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 — a Microscope image of hBN/SLG/hBN on ring resonator. The black dashed line indicates the area over which the Raman map in d is measured. Scale bar, 10 μm. b Raman spectrum measured at the position of the final device. c AFM image of LMH. The yellow dashed line indicates the area of top and bottom hBN. The blue line indicates the SLG area. Scale bar, 10 μm. d Raman map of FWHM(2D). The red box marks the position of the final device in a, c, d.