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Within the model of rectangular potentials and different effective masses ofelectrons in different elements of plane two-barrier resonance tunnel structurethere is developed a theory of spectral parameters of quasi-stationary statesand active conductivity for the case of mono-energetic electronic currentinteracting with electromagnetic field. It is shown that the two-barrierresonance tunnel structure can be utilized as a separate or active element ofquantum cascade laser or detector. For the experimentally studiedIn$_{0.53}$Ga$_{0.47}$As/In$_{0.52}$Al$_{0.48}$As nano-system it is establishedthat the two-barrier resonance tunnel structure, in detector and laser regimes,optimally operates (with the biggest conductivity at the smallest excitingcurrent) at the quantum transitions between the lowest quasi-stationary states.

Active conductivity of plane two-barrier resonance tunnel structure as operating element of quantum cascade laser or detector