| Autor: |
Osipov, Vladimir Yu., Treussart, François, Zargaleh, Soroush Abbasi, Takai, Kazuyuki, Shakhov, Fedor M., Hogan, Benjamin T., Baldycheva, Anna |
| Předmět: |
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| Zdroj: |
Nanoscale Research Letters; 8/16/2019, Vol. 14 Issue 1, pN.PAG-N.PAG, 1p |
| Abstrakt: |
The 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. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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