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Designing a deterministic, bright, robust, room temperature stable, on-demandsolid-state single photon source has been a major demand in the field ofquantum-photonics. For this, various single-photon resonator and antennaschemes are being actively explored. Here, using the Cartesian multi-polardecomposition of the excited Mie-scattering moments, we present the design of aall-dielectric coupled-dipolar antenna comprising of two dielectric (Tin-oxide,TiO$_2$) cylinders sandwiching a nanodiamond based nitrogen-vacancy (NV$^-$)center trapped in a poly-vinyl alcohol (PVA) matrix. The Mie-scatteringresonant cavity formed in the middle PVA layer provides more than an order ofmagnitude decay rate or Purcell enhancement. The balancing of the electric andmagnetic dipolar moments (a phenomenon commonly known as the Kerker condition)of the coupled TiO$_2$ cylinders under NV$^-$ dipole excitation, providessignificant directionality to the radiation pattern. Using a collection lenswith a numerical aperture (NA) of 0.9 the vertical collection efficiency (VCE)was observed to be around 80\% at the NV$^-$ center's zero-phonon linewavelength.

Mie-scattering controlled all-dielectric resonator-antenna for bright and directional point dipole emission