A Waveguide-Coupled On-Chip Single-Photon Source

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A. Laucht, S. Pütz, T. Günthner, N. Hauke, R. Saive, S. Frederick, M. Bichler, M. C. Amann, A. Holleitner, M. Kaniber, and J. J. Finley


Phys. Rev. X 2, 011014 (2012)

We investigate single-photon generation from individual self-assembled InGaAs quantum dots coupled to the guided optical mode of a GaAs photonic crystal waveguide. By performing confocal microscopy measurements on single dots positioned within the waveguide, we locate their positions with a precision better than 0.5  μm. Time-resolved photoluminescence and photon autocorrelation measurements are used to prove the single-photon character of the emission into the propagating waveguide mode. The results obtained demonstrate that such nanostructures can be used to realize an on-chip, highly directed single-photon source with single-mode spontaneous emission coupling efficiencies in excess of βΓ∼85% and the potential to reach maximum emission rates >1  GHz.