  We propose a novel approach to facilitate a readout processes of isolated
negatively charged nitrogen-vacancy (NV) centers based on the concept of
all-dielectric nanoantennas. We reveal that all-dielectric nanoantenna can
significantly enhance both the emission rate and emission extraction efficiency
of a photoluminescence signal from a single NV center in a diamond nanoparticle
placed on a dielectric substrate. We prove that the proposed approach provides
high directivity, large Purcell factor, and efficient beam steering, thus
allowing an efficient far-field initialization and readout of several NV
centers separated by subwavelength distances.
