Bright single photon source based on self-aligned quantum dot-cavity systems.
We report on a quasi-planar quantum-dot-based single-photon source that shows an unprecedented high extraction efficiency of 42% without complex photonic resonator geometries or post-growth nanofabrication. This very high efficiency originates from the coupling of the photons emitted by a quantum dot to a Gaussian shaped nanohill defect that naturally arises during epitaxial growth in a self-aligned manner. We investigate the morphology of these defects and characterize the photonic operation mechanism. Our results show that these naturally arising coupled quantum dot-defects provide a new avenue for efficient (up to 42% demonstrated) and pure (g(2)(0) value of 0.023) single-photon emission.
Sebastian
S
Maier
Peter
P
Gold
Alfred
A
Forchel
Niels
N
Gregersen
Jesper
J
Mørk
Sven
S
Höfling
Christian
C
Schneider
Martin
M
Kamp