The nitrogen-vacancy color center in diamond is one of the most important systems in the fast-growing field of sensing. This color centers are used in both high-resolution and high-sensitivity sensors. However, techniques for quick and efficient formations of this color center are still in the development stage. In this paper, we present a study on the influence of the electron irradiation dose on the conversion of substitutional nitrogen into NV− centers. The study was done on diamonds that were highly enriched with nitrogen (~100 ppm), which on one hand should maximize the effect of irradiation, and on another be of interest for high-sensitivity magnetometers. The maximum achieved conversion efficiency was as high as 37±3.7, with no observed saturation on the electron dose even with the simplest annealing procedure. The measurements of the corresponding dephasing time made it possible to estimate for shot-noise limited sensitivity per unit volume of a stationary field sensor with such a diamond to be 9±1×10−14T/Hz⋅mm−3.
@article{arxiv.2208.12706,
title = {The study of the efficiency of nitrogen to NV-center conversion in high nitrogen content samples},
author = {S. V. Bolshedvorskii and S. A. Tarelkin and V. V. Soshenko and I. S. Cojocaru and O. R. Rubinas and V. N. Sorokin and V. G. Vins and A. N. Smolyaninov and S. G. Buga and A. S. Galkin and T. E. Drozdova and M. S. Kuznetsov and S. A. Nosukhin and A. V. Akimov},
journal= {arXiv preprint arXiv:2208.12706},
year = {2022}
}