Increase of the Zero-Phonon-Line Emission from Color Centers in Nanodiamonds by Coupling with Dielectric Nanocavity

Abstract

Development of single photon sources based on color centers in diamond nanoparticles requires a sufficient increase in their brightness. Conventionally, this may be accomplished by coupling of a color center to a high-quality dielectric cavity. Efficient interaction requires a nanodiamond to be placed close to the maximum of the field distribution of the mode of the structure, which can be achieved with a dielectric nanoparticle cavity characterized by a strong electric field inside the gap between the particles. In this work, we calculate the characteristics of such cavity composed of dielectric nanocylinders with realistic geometrical parameters, and investigate the influence of material losses in dielectric on the performance of such system for different color centers. Our results provide a way for designing a dielectric cavity for efficient increase of emission rate of color centers embedded in nanodiamonds.