OPTIMIZATION OF OPERATION OF TERA HERTZ NANO-LASER AT THE BASE OF THREE-BARRIER RESONANCE TUNNEL STRUCTURE WITH SHIFTED BOTTOMS OF POTENTIAL WELLS

摘要

The quantum mechanical theory of active conductivity is developed within the model of rectangular potentials and different effective masses of electron in the different elements of open plane three-barrier resonance tunnel structure. For the experimentally investigated resonance tunnel structure with In_(1-x)Al_xAs - wells and In_(1-x)Al_xAs - barriers the analysis of conductivity of monochrome electronic beam interacting with the electromagnetic field in approximation of weak signal is performed. It is shown that for the three-barrier resonance tunnel structure with guided shifts of inner potential wells bottoms there exists such position of inner potential barrier respectively the outer ones, at which the density of excited current is minimal and the density of output current from the system is maximal. Herein, the maximal negative conductivity proportional to the radiation intensity of quantum cascade laser active element is formed in the desired range of frequencies due to the quantum transitions between two lower electron quasi-stationary states.