A nanowire optical nanocavity for broadband enhancement of spontaneous emission

To deliver an optimal performance for photonic quantum technologies, semiconductor dots should be integrated in a carefully designed structure. Here, we introduce nanowire optical nanocavity free-space emission. Thanks to its ultrasmall mode volume, this simple structure offers large acceleration of spontaneous emission (predicted Purcell factor 6.3) that is maintained over 30-nm bandwidth. In addition, dielectric screening effect strongly suppresses the into 3D continuum radiation modes. The fraction funneled cavity reaches 0.98 at resonance and exceeds 0.95 100-nm spectral range. Close-to-optimal collection efficiency equivalent bandwidth predicted value 0.54 first lens with numerical aperture (NA) 0.75. As experimental demonstration concept, fabricate Au–SiO2–GaAs device embedding isolated InAs dots. We measure maximal by as 5.6 bright dot (collection 0.35 NA = 0.75). This constitutes promising building block realize advanced sources light broad range material systems.