Journal
PHYSICA B-CONDENSED MATTER
Volume 376, Issue -, Pages 926-929Publisher
ELSEVIER
DOI: 10.1016/j.physb.2005.12.232
Keywords
diamond; nanocrystals; colour centres defects; single photon
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We used optical confocal microscopy to study optical properties of diamond 50 nm nanocrystals first irradiated with an electron beam, then dispersed as a colloidal solution and finally deposited on a silica slide. At room temperature, under CW laser excitation at a wavelength of 514.5 nm we observed perfectly photostable single nitrogen-vacancy (NV) colour defects embedded in the nanocrystals. From the zero-phonon line around 575 nm in the spectrum of emitted light, we infer a neutral NV0 type of defect. Such nanoparticle with intrinsic fluorescence are highly promising for applications in biology where long-term emitting fluorescent bio-compatible nanoprobes are still missing. (c) 2006 Elsevier B.V. All rights reserved.
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