Controling the single-diamond nitrogen-vacancy color center photoluminescence spectrum with a fabry-perot microcavity

We present here both theoretical and experimental results on the fluorescence of single defect centers in diamond nanocrystals embedded in a planar dielectric microcavity. From a theoretical point of view, we showthat the overall fluorescence collection efficiency using a moderate numerical aperture microscope objective can be enhanced by using a low-quality-factor microcavity. This could be used in particular for low-temperature applications, where the numerical aperture of collection microscope objectives is limited due to the experimental constraints. We experimentally investigate the control of the fluorescence spectrum of the emitted light from a single center. We show the simultaneous narrowing of the room temperature broadband emission spectrum and the increase in the fluorescence spectral density.