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. 2019 Apr 8;9:5786. doi: 10.1038/s41598-019-42314-7

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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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(a) Schematic drawing of the diamond layers fabricated in this work. The arrows represent NV centres aligned along the [111] crystal axis. (b) Confocal image showing a cross section of a sample, where the fluorescence from the NVs in the diamond layer is labelled. (c) Histogram from the analysis of Samples A and B, showing the increased number of NVs in the layer grown at higher MW power. (d) ODMR spectrum showing the preferential alignment of the ensemble of NV centres. Black points are experimentally measured data whereas the blue solid line is a Lorentzian Fit to the data and the red line represents the simulated ODMR transitions at the applied external magnetic field. The transitions at 2776 Mhz and 2964 Mhz belong to [111] oriented NVs whereas the other correspond to the other three directions.