We experimentally demonstrate that two-photon pumping of “dark” excitons in quantum wells embedded in semiconductor microcavities can result in exciton-polariton injection and photon lasing. In the case of a semiconductor micropillar pumped at half of the exciton frequency, we observe a clear threshold behavior, characteristic of the vertical cavity surface emitting laser transition. These results are interpreted in terms of stimulated emission of terahertz photons, which allows for conversion of “dark” excitons into exciton-polaritons.
© 2014 Optical Society of America
Original Manuscript: October 4, 2013
Revised Manuscript: December 2, 2013
Manuscript Accepted: December 3, 2013
Published: January 8, 2014
Godefroy Leménager, Ferruccio Pisanello, Jacqueline Bloch, Alexey Kavokin, Alberto Amo, Aristide Lemaitre, Elisabeth Galopin, Isabelle Sagnes, Massimo De Vittorio, Elisabeth Giacobino, and Alberto Bramati, "Two-photon injection of polaritons in semiconductor microstructures," Opt. Lett. 39, 307-310 (2014)