  Quantum-dot (QD) nanolasers integrated on a silicon photonic circuit are
demonstrated for the first time. QD nanolasers based on one-dimensional
photonic crystal nanocavities containing InAs/GaAs QDs are integrated on
CMOS-processed silicon waveguides cladded by silicon dioxide. We employed
transfer-printing, whereby the three-dimensional stack of photonic
nanostructures is assembled in a simple pick-and-place manner. Lasing operation
and waveguide-coupling of an assembled single nanolaser are confirmed through
micro-photoluminescence spectroscopy. Furthermore, by repetitive
transfer-printing, two QD nanolasers integrated onto a single silicon waveguide
are demonstrated, opening a path to develop compact light sources potentially
applicable for wavelength division multiplexing.
