Self-aligned quantum-dot growth for single-photon sources

The buried oxide current-aperture in a pin diode-structure is used to create a strain field for the self-aligned nucleation of site-controlled single quantum dots. A single-photon source fabricated applying this approach shows spectrally very narrow emission lines (FWHM ≤ 25 μeV) and spectrally pure single-photon emission with a second-order autocorrelation g (2) (0) = 0.05.