Bullseye dielectric cavities for photon collection from a surface-mounted quantum-light-emitter

Abstract

Coupling light from a point source to a propagating mode is an important problem in nano-photonics and is essential for many applications in quantum optics. Circular “bullseye” cavities, consisting of concentric rings of alternating refractive index, are a promising technology that can achieve near-unity coupling into a first lens. Here we design a bullseye structure suitable for enhancing the emission from dye molecules, 2D materials and nano-diamonds positioned on the surface of these cavities. A periodic design of cavity, meeting the Bragg scattering condition, achieves a Purcell factor of 22.5 and collection efficiency of 80%. We also tackle the more challenging task of designing a cavity for coupling to a low numerical aperture fibre in the near field. Finally, using an iterative procedure, we study how the collection efficiency varies with apodised (non-periodic) rings.

Fluorescence Enhancement of Single V2 Centers in a 4H-SiC Cavity Antenna

“…While nanophotonic cavities offer the highest enhancement among the above-mentioned structures, they rely on complicated fabrication processes, tight restrictions on the emitter placement, and complex methods to keep the emitter on resonance with the structure. Approaches like bullseye cavities, , plasmonic enhancement structures, , and planar antenna structures − represent an interesting middle ground. They have shown a much higher photon count enhancement than SILs or nanopillars while offering relaxed restrictions on the emitter position.…”