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Extracting light into free space is one of the challenges to face when dealing with solid-state emitters embedded within high-index materials. In particular, improving the extraction efficiency has been the object of intensive research when intrinsically dim light sources, like single-photon emitters, are implemented for fundamental science and quantum information technology applications.
Here, we show that metallic nano-rings, transferred on a gold-coated substrate, can be implemented to increase the extraction efficiency of single photons emitted by InAs quantum dots, thanks to the focusing effect of the plasmonic device. Furthermore, we show that such a device is scalable and gives broadband (over 60 nm) operation, as opposed to narrowband cavity-based geometries.
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