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The possibility of controlled creation of NV centers at any given depth have a substantial potential for quantum information processing and sensor applications. Here we report on creation of localized NV centers using nitrogen delta doping during a chemical vapor deposition diamond growth process. Using confocal microscopy, we investigated optical properties of as grown NV centers in delta-doped layer, demonstrated availability of isolated space clusters of color centers in the layer, analyzed space distribution of these clusters, and using seconds-order correlation function measurements demonstrated that clusters contain from one to few color centers.

In this work, we study the optical properties of NV centers in detonation nanodiamonds and SiV centers in HPHT nanodiamonds with the size about 10 nm. We experimentally measure the size of nanodiamonds with color centers on the substrate. We demonstrate that detonation nanodiamonds have tendency to aggregate, whereas HPHT diamond may lay as single digit crystals. In despite of the aggregation and ultrasmall size, these nanodiamonds still contain bright single color center with antibunching photon statistics.