Ontology type: schema:ScholarlyArticle Open Access: True
2019-08-16
AUTHORSVladimir Yu. Osipov, François Treussart, Soroush Abbasi Zargaleh, Kazuyuki Takai, Fedor M. Shakhov, Benjamin T. Hogan, Anna Baldycheva
ABSTRACTThe content of nitrogen-vacancy (NV−) colour centres in the nanodiamonds (DNDs) produced during the detonation of nitrogen-containing explosives was found to be 1.1 ± 0.3 ppm. This value is impressive for nanodiamonds of size < 10 nm with intentionally created NV− centres. The concentration was estimated from the electron paramagnetic resonance as determined from the integrated intensity of the g = 4.27 line. This line is related with “forbidden” ∆ms = 2 transitions between the Zeeman levels of a NV− centre’s ground triplet state. Confocal fluorescence microscopy enables detection of the red photoluminescence (PL) of the NV− colour centres in nanoscale DND aggregates formed from the 5-nm nanoparticles. Subwavelength emitters consisting of NV− with sizes a few times smaller than the diffraction-limited spot are clearly distinguished. We have further observed an abrupt drop in the PL intensity when mixing and anti-crossing of the ground and excited states spin levels in NV− occurs under an applied external magnetic field. This effect is a unique quantum feature of NV− centres, which cannot be observed for other visible domain light-emitting colour centres in a diamond lattice. More... »
PAGES279
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DOIhttp://dx.doi.org/10.1186/s11671-019-3111-y
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PUBMEDhttps://www.ncbi.nlm.nih.gov/pubmed/31420765
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