Abstract

AbstractIntersubband response in a biased superlattice with equipopulated levels is studied within the tight‐binding approximation and the complex dielectric permittivity is calculated beyond the Born approximation for a wide spectral region. The low‐frequency enhancement of the dispersion of permittivity is found and the conditions to obtain the stimulated emission regime is estimated. The enhancement of the emission due to the THz waveguide effect is also considered for the cases of the BSL placed between ideal metallic mirrors, the free‐standing BSL, and BSL at a vacuum‐dielectric interface. An appearance of the localized THz mode is described for the last case. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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