Polarization selection rules in exciton-based terahertz lasers

G Slavcheva, A. V. Kavokin

OAI: oai:purehost.bath.ac.uk:openaire_cris_publications/f80ed745-9a15-494b-abd5-2d70dc538188 • DOI: https://doi.org/10.1103/PhysRevB.88.085321

Optical pumping of excited exciton states in semiconductor quantum wells is a tool for the realization of ultracompact terahertz (THz) lasers based on stimulated optical transition between excited (2p) and ground (1s) exciton states. We show that the probability of two-photon absorption by a 2p exciton is strongly dependent on the polarization of both photons. Variation of the threshold power for THz lasing by a factor of 5 is predicted by switching from linear to circular pumping. We calculate the polarization dependence of the THz emission and identify photon polarization configurations for achieving maximum THz photon generation quantum efficiency.