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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.
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Details
1 Cardiff University, School of Physics and Astronomy, Cardiff, UK (GRID:grid.5600.3) (ISNI:0000 0001 0807 5670)
2 Cardiff University, School of Engineering, Cardiff, UK (GRID:grid.5600.3) (ISNI:0000 0001 0807 5670)
3 Cardiff University, School of Physics and Astronomy, Cardiff, UK (GRID:grid.5600.3) (ISNI:0000 0001 0807 5670); Cardiff University, School of Engineering, Cardiff, UK (GRID:grid.5600.3) (ISNI:0000 0001 0807 5670)