Theory of Dynamic Conductivity of Three-Barrier Resonance-Tullel Structure with Two-Photon Laser Transitions

<p>Within the approximation of effective mass and rectangular potential barriers for the electron and using theobtained solutions of complete Schrodinger equation, the theory of dynamic conductivity for three-barrierresonant tunneling structure (InGaAs/InAlAs) with different depths of potential wells driven by weakelectromagnetic field is developed in one- and two-photon approach.It is shown that varying Ga concentration one can obtain such geometric configurations of nanostructure,being an active region of quantum cascade laser, in which the increasing intensity of laser radiation, produced byelectron quantum transitions accompanied by radiation of two photons with equal energy, is observed. It isestablished that the contribution of two-photon transitions into the complete magnitude of dynamic conductivityis not smaller than 37 %.<br /><strong>Keywords:</strong> quantum cascade laser.</p>