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We investigate the possibility of interconduction band gain without global inversion by engineering the conduction band effective masses so that the upper lasing subband has an effective mass considerably smaller than the lower lasing subband that could not be obtained in conventional III-V materials. We recover the expected dispersive gain shape for(More)
The main candidate to be a ubiquitous high power THz source is the intersubband-based quantum cascade laser (qcl). In this review we start by discussing current challenges for THz intersubband qcl development from a microscopic point of view. Next we evolve to a discussion about the search for new mechanisms and structure designs that can lead to(More)
Efficient and predictive simulators are an essential tool for design and optimization of quantum cascade lasers (QCLs), since experimental trial and error is a time-consuming and expensive process due to the high complexity involved in the growth and processing of samples. We present a highly efficient implementation of a next-generation QCL simulator based(More)
In this paper, we calculate the luminescence of the dilute quaternary InAs<sub>1-x-y</sub>N<sub>x</sub>Sb<sub>y</sub> semiconductor using a microscopic approach. The theory starts with the band anticrossing model applied to both conduction and the valence band to generate input for analytical approximations that lead to luminescence spectra, including(More)
The author discusses the main goals and recent achievements of MPNS COST ACTION MP1204, TERA-MIR Radiation: Materials, Generation, Detection and Applications, whose main objectives are to advance novel materials, concepts and device designs for generating and detecting THz and Mid Infrared radiation using semiconductor, superconductor, metamaterials and(More)