Modal Coupling of Single Photon Emitters Within Nanofibre Waveguides

Nanoscale generation of individual photons in confined geometries is an exciting research field aiming at exploiting localised electromagnetic fields for light manipulation. One of the outstanding challenges of photonic systems combining emitters with nanostructured media is the selective channelling of photons emitted by embedded sources into specific optical modes and their transport at distant locations in integrated systems. Here we show that soft-matter nanofibres, electrospun with embedded emitters, combine subwavelength field localisation and large broadband near-field coupling with low propagation losses. By momentum spectroscopy we quantify the modal coupling efficiency identifying the regime of single-mode coupling. These nanofibres do not rely on resonant interactions making them ideal for room-temperature operation, and offer a scalable platform for future quantum information technology.