Metal-Dielectric Nanopillar Antenna-Resonators for Efficient Collected Photon Rate from Silicon Carbide Color Centers.

A yet unresolved challenge in developing quantum technologies based on color centres in high refractive index semiconductors is the efficient fluorescence enhancement of point defects in bulk materials. Optical resonators and antennas have been designed to provide directional emission, spontaneous emission rate enhancement and collection efficiency enhancement at the same time. While collection efficiency enhancement can be achieved by individual nanopillars or nanowires, fluorescent emission enhancement is achieved using nanoresonators or nanoantennas.

Which plasmonic nano-antenna is best for free-space out-coupling of single photon emission from a hyperbolic metamaterial resonator?

Recently, hyperbolic metamaterials (HMMs) have shown large emission-rate/Purcell enhancement for emitters coupled to them. However, due to the large momentum ($ k $) mismatch between the high-k hyperbolic modes of HMMs and free-space modes, the far-field out-coupling of the emission is limited and requires an antenna. In this work, we present an in-depth theoretical study of the performance of some commonly known plasmonic antennas-cylindrical, cuboid, crossed, and bow-tie-when coupled to a HMM.

Deterministic placement of ultra-bright near-infrared color centers in arrays of silicon carbide micropillars.

We report the enhancement of the optical emission between 850 and 1400 nm of an ensemble of silicon mono-vacancies (V), silicon and carbon divacancies (VV), and nitrogen vacancies (NV) in an n-type 4H-SiC array of micropillars. The micropillars have a length of ca. 4.