Effect of Reactive Ion Etching on the Luminescence of GeV Color Centers in CVD Diamond Nanocrystals

The negatively charged germanium-vacancy GeV<sup>−</sup> color centers in diamond nanocrystals are solid-state photon emitters suited for quantum information technologies, bio-sensing, and labeling applications. Due to the small Huang–Rhys factor, the GeV<sup>−</sup>-center z...

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Autores principales:	Sergey A. Grudinkin, Nikolay A. Feoktistov, Kirill V. Bogdanov, Mikhail A. Baranov, Valery G. Golubev, Alexander V. Baranov
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	diamond nanocrystals color centers chemical vapor deposition photoluminescence Raman spectroscopy Chemistry QD1-999
Acceso en línea:	https://doaj.org/article/e9c4c7b88a6545bd8612cc0e970ab559
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spelling	oai:doaj.org-article:e9c4c7b88a6545bd8612cc0e970ab5592021-11-25T18:29:59ZEffect of Reactive Ion Etching on the Luminescence of GeV Color Centers in CVD Diamond Nanocrystals10.3390/nano111128142079-4991https://doaj.org/article/e9c4c7b88a6545bd8612cc0e970ab5592021-10-01T00:00:00Zhttps://www.mdpi.com/2079-4991/11/11/2814https://doaj.org/toc/2079-4991The negatively charged germanium-vacancy GeV<sup>−</sup> color centers in diamond nanocrystals are solid-state photon emitters suited for quantum information technologies, bio-sensing, and labeling applications. Due to the small Huang–Rhys factor, the GeV<sup>−</sup>-center zero-phonon line emission is expected to be very intensive and spectrally narrow. However, structural defects and the inhomogeneous distribution of local strains in the nanodiamonds result in the essential broadening of the ZPL. Therefore, clarification and elimination of the reasons for the broadening of the GeV<sup>−</sup> center ZPL is an important problem. We report on the effect of reactive ion etching in oxygen plasma on the structure and luminescence properties of nanodiamonds grown by hot filament chemical vapor deposition. Emission of GeV<sup>−</sup> color centers ensembles at about 602 nm in as-grown and etched nanodiamonds is probed using micro-photoluminescence and micro-Raman spectroscopy at room and liquid nitrogen temperature. We show that the etching removes the nanodiamond surface sp<sup>2</sup>-induced defects resulting in a reduction in the broad luminescence background and a narrowing of the diamond Raman band. The zero-phonon luminescence band of the ensemble of the GeV<sup>−</sup> centers is a superposition of narrow lines originated most likely from the GeV<sup>−</sup> center sub-ensembles under different uniaxial local strain conditions.Sergey A. GrudinkinNikolay A. FeoktistovKirill V. BogdanovMikhail A. BaranovValery G. GolubevAlexander V. BaranovMDPI AGarticlediamond nanocrystalscolor centerschemical vapor depositionphotoluminescenceRaman spectroscopyChemistryQD1-999ENNanomaterials, Vol 11, Iss 2814, p 2814 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	diamond nanocrystals color centers chemical vapor deposition photoluminescence Raman spectroscopy Chemistry QD1-999
spellingShingle	diamond nanocrystals color centers chemical vapor deposition photoluminescence Raman spectroscopy Chemistry QD1-999 Sergey A. Grudinkin Nikolay A. Feoktistov Kirill V. Bogdanov Mikhail A. Baranov Valery G. Golubev Alexander V. Baranov Effect of Reactive Ion Etching on the Luminescence of GeV Color Centers in CVD Diamond Nanocrystals
description	The negatively charged germanium-vacancy GeV<sup>−</sup> color centers in diamond nanocrystals are solid-state photon emitters suited for quantum information technologies, bio-sensing, and labeling applications. Due to the small Huang–Rhys factor, the GeV<sup>−</sup>-center zero-phonon line emission is expected to be very intensive and spectrally narrow. However, structural defects and the inhomogeneous distribution of local strains in the nanodiamonds result in the essential broadening of the ZPL. Therefore, clarification and elimination of the reasons for the broadening of the GeV<sup>−</sup> center ZPL is an important problem. We report on the effect of reactive ion etching in oxygen plasma on the structure and luminescence properties of nanodiamonds grown by hot filament chemical vapor deposition. Emission of GeV<sup>−</sup> color centers ensembles at about 602 nm in as-grown and etched nanodiamonds is probed using micro-photoluminescence and micro-Raman spectroscopy at room and liquid nitrogen temperature. We show that the etching removes the nanodiamond surface sp<sup>2</sup>-induced defects resulting in a reduction in the broad luminescence background and a narrowing of the diamond Raman band. The zero-phonon luminescence band of the ensemble of the GeV<sup>−</sup> centers is a superposition of narrow lines originated most likely from the GeV<sup>−</sup> center sub-ensembles under different uniaxial local strain conditions.
format	article
author	Sergey A. Grudinkin Nikolay A. Feoktistov Kirill V. Bogdanov Mikhail A. Baranov Valery G. Golubev Alexander V. Baranov
author_facet	Sergey A. Grudinkin Nikolay A. Feoktistov Kirill V. Bogdanov Mikhail A. Baranov Valery G. Golubev Alexander V. Baranov
author_sort	Sergey A. Grudinkin
title	Effect of Reactive Ion Etching on the Luminescence of GeV Color Centers in CVD Diamond Nanocrystals
title_short	Effect of Reactive Ion Etching on the Luminescence of GeV Color Centers in CVD Diamond Nanocrystals
title_full	Effect of Reactive Ion Etching on the Luminescence of GeV Color Centers in CVD Diamond Nanocrystals
title_fullStr	Effect of Reactive Ion Etching on the Luminescence of GeV Color Centers in CVD Diamond Nanocrystals
title_full_unstemmed	Effect of Reactive Ion Etching on the Luminescence of GeV Color Centers in CVD Diamond Nanocrystals
title_sort	effect of reactive ion etching on the luminescence of gev color centers in cvd diamond nanocrystals
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/e9c4c7b88a6545bd8612cc0e970ab559
work_keys_str_mv	AT sergeyagrudinkin effectofreactiveionetchingontheluminescenceofgevcolorcentersincvddiamondnanocrystals AT nikolayafeoktistov effectofreactiveionetchingontheluminescenceofgevcolorcentersincvddiamondnanocrystals AT kirillvbogdanov effectofreactiveionetchingontheluminescenceofgevcolorcentersincvddiamondnanocrystals AT mikhailabaranov effectofreactiveionetchingontheluminescenceofgevcolorcentersincvddiamondnanocrystals AT valeryggolubev effectofreactiveionetchingontheluminescenceofgevcolorcentersincvddiamondnanocrystals AT alexandervbaranov effectofreactiveionetchingontheluminescenceofgevcolorcentersincvddiamondnanocrystals
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Effect of Reactive Ion Etching on the Luminescence of GeV Color Centers in CVD Diamond Nanocrystals

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