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To implement quantum light sources based on quantum emitters in applications,it is desirable to improve the extraction efficiency of single photons. Inparticular controlling the directionality and solid angle of the emission arekey parameters, for instance, to couple single photons into optical fibers andsend the information encoded in quantum light over long distances, for quantumcommunication applications. In addition, fundamental studies of the radiativebehavior of quantum emitters, including studies of coherence and blinking,benefit from such improved photon collection. Quantum dots grown viaStranski-Krastanov technique have shown to be good candidates for bright,coherent, indistinguishable quantum light emission. However, one of thechallenges associated with these quantum light sources arises from the factthat the emission wavelengths can vary from one emitter to the other. To thisend, broadband light extractors that do not rely on high-quality factor opticalcavities would be desirable, so that no tuning between the quantum dot emissionwavelength and the resonator used to increase the light extraction is needed.Here, we show that metallic nano-rings combined with gold back reflectorsincrease the collection efficiency of single photons and we study thestatistics of this effect when quantum dots are spatially randomly distributedwithin the nano-rings. We show an average increase in the brightness of about afactor 7.5, when comparing emitters within and outside the nano-rings indevices with a gold back reflector, we measure count rates exceeding 7 x 10^6photons per second and single photon purities as high as 85% +/- 1%. Theseresults are important steps towards the realisation of scalable, broadband,easy to fabricate sources of quantum light for quantum communicationapplications.

Broadband, efficient extraction of quantum light by a photonic device comprised of a metallic nano-ring and a gold back reflector