All-dielectric nanoantenna for single NV center radiation collection enhancement

It is well known that the radiation from single nitrogen-vacancy center in a diamond which is placed on a dielectric substrate, propagates into this substrate. This catastrophic problem leads to dramatically reduction of the detected signal level. Here we apply a novel concept of all-dielectic nanoantennas to successfully overcome this problem. We proposed an original all-dielectric nanoantenna which can increase both the fluorescence collection efficiency and zero phonon line emission, simultaneously. Our design has negligible dissipation losses and high value of Purcell factor. Also we believe that this nanoantenna can be useful for systems with few quantum emitters for selective spin state far-field readout.