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Key requirements for quantum plasmonic nanocircuits are reliablesingle-photon sources, high coupling efficiency to the plasmonic structures andlow propagation losses. Self-assembled epitaxially grown GaAs quantum dots areclose to ideal stable, bright and narrowband single-photon emitters. Likewise,wet-chemically grown monocrystalline silver nanowires are among the bestplasmonic waveguides. However, large propagation losses of surface plasmons onthe high-index GaAs substrate prevent their direct combination. Here, we showby experiment and simulation that the best overall performance of the quantumplasmonic nanocircuit based on these building blocks is achieved in theintermediate field regime with an additional spacer layer between the quantumdot and the plasmonic waveguide. High-resolution cathodoluminescencemeasurements allow a precise determination of the coupling distance and supporta simple analytical model to explain the overall performance. The couplingefficiency is increased up to four times by standing wave interference near theend of the waveguide.

Intermediate Field Coupling of Single Epitaxial Quantum Dots to Plasmonic Waveguides