Fluorescent diamond microcrystals with NV- centers for applications in photonics and sensors: identification and photophysical signatures
Osipov V. Yu. 1, Shakhov F. M. 1, Bogdanov K. V. 2, Takai K. 3, Baranov A. V. 2
1Ioffe Institute, St. Petersburg, Russia
2ITMO University, St. Petersburg, Russia
3Department of Chemical Science and Technology, Hosei University, Koganei, Tokyo, Japan
Email: osipov@mail.ioffe.ru, Fedor.Shakhov@mail.ioffe.ru, kirw.bog@gmail.com, takai@hosei.ac.jp, a_v_baranov@yahoo.com

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Synthetic microcrystalline Ib HPHT diamonds synthesized using a nickel-containing catalyst and containing fluorescent negatively charged nitrogen-vacancy (NV-) centers, specially introduced by irradiation with high-energy electrons, were studied. A set of identification signatures corresponding to diamond microcrystals with high optical brightness and a concentration of NV- centers of about 4.5 ppm is shown. Electron paramagnetic resonance signals for nitrogen impurity atoms in the neutral state and nickel in the -1 charge state depend on temperature according to Curie's law, while the signal g=4.295 (W15), associated with Δ ms =2 transitions in the NV- center, demonstrates a different type temperature behavior. Illumination of microcrystals with light in the spectral range of 1.38-2.95 eV at T=100 K entails optical spin polarization for the ms=0 level of the ground unexcited state of 3A2 NV- centers. Synthesized diamond microcrystals can be used in photonics devices. Keywords: Diamond microcrystals, nitrogen-vacancy centers, paramagnetic centers, luminescence, electron paramagnetic resonance.
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