Slavcheva, G. and V. Kavokin, A., 2013. Polarization selection rules in exciton-based terahertz lasers. Physical Review B, 88 (8), 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.
|Item Type ||Articles|
|Creators||Slavcheva, G.and V. Kavokin, A.|
|Departments||Faculty of Science > Physics|
|Publisher Statement||e085321.pdf: ©2013 American Physical Society|
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