Abstract
Optical properties of modified type II W-shaped quantum wells have been investigated with the aim to be utilized in interband cascade lasers. The results show that introducing a tensely strained GaAsSb layer, instead of a commonly used compressively strained GaInSb, allows employing the active transition involving valence band states with a significant admixture of the light holes. Theoretical predictions of multiband k·p theory have been experimentally verified by using photoluminescence and polarization dependent photoreflectance measurements. These results open a pathway for practical realization of mid-infrared lasing devices with uncommon polarization properties including, for instance, polarization-independent midinfrared light emitters.
Highlights
Type-II quantum wells with tensile-strained GaAsSb layers for interband cascade lasers with tailored valence band mixing
Optical properties of modified type II W-shaped quantum wells have been investigated with the aim to be utilized in interband cascade lasers
Theoretical predictions of multiband kÁp theory have been experimentally verified by using photoluminescence
Summary
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