Polarization selection rules in exciton-based terahertz lasers

Article

关键词: 2-PHOTON ABSORPTION;    GREENS-FUNCTIONS;    TRANSITIONS;    SEMICONDUCTORS;   

DOI  :  10.1103/PhysRevB.88.085321

来源: SCIE

【 摘 要 】

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.

【 授权许可】

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