Abstract：
:The nitrogen-vacancy (NV) centre in diamond is a promising candidate for quantum computing applications and magnetic sensing applications, because it is an atomic-scale defect with stable coherence time (T2) and reliable accessibility at room temperature. We demonstrated a method for improving the NV spin properties (the full width half maximum (FWHM) value of the magnetic resonance spectrum and T2) through a near-field (NF) etching method under ambient conditions. The NF etching method, based on a He-Cd ultraviolet laser (325 nm), which is longer than the absorption edge of the oxygen molecule, enabled selective removal of defects on the nanodiamond surface. We observed a decrease in the FWHM value close to 15% and an increase in T2 close to 25%. Since our technique can be easily reproduced, a wide range of NV centre applications could be improved, especially magnetic sensing applications. Our results are especially attractive, because they have been obtained under ambient conditions and only require a light source with wavelength slightly above the O2 absorption edge.
journal_name
Sci Repjournal_title
Scientific reportsauthors
Brandenburg F,Nagumo R,Saichi K,Tahara K,Iwasaki T,Hatano M,Jelezko F,Igarashi R,Yatsui Tdoi
10.1038/s41598-018-34158-4subject
Has Abstractpub_date
2018-10-26 00:00:00pages
15847issue
1issn
2045-2322pii
10.1038/s41598-018-34158-4journal_volume
8pub_type
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