quantum photonic architectures demand highly efficient,
high-purity single-photon sources, which can be frequency matched
via external tuning. We demonstrate a single-photon source based on
an InAs quantum dot embedded in a micropillar resonator, which is
frequency tunable via externally applied stress. Our platform combines
the advantages of a micropillar cavity and the piezo-strain-tuning
technique enabling single-photon spontaneous emission enhancement
via the Purcell effect and wavelength-tunable quantum dots (QDs).
Our optomechanical platform has been implemented by integration of
semiconductor-based QD–micropillars on a piezoelectric substrate.
The fabricated device exhibits spontaneous emission enhancement with
a Purcell factor of 4.4 ± 0.7 and allows for a pure triggered
single-photon generation with g(2)(0)
<0.07 under resonant excitation. A quantum dot emission energy
tuning range of 0.75 meV for 27 kV/cm
applied to the piezosubstrate has been achieved. Our results pave
the way toward the scalable implementation of single-photon quantum
photonic technologies using optoelectronic devices.
- Semiconductor quantum dots
- Micropillar cavity
- Strain tuning
- Single-photon source
- Resonance fluorescence