Resonant tunneling electron injection in quantum cascade laser structures

Summary form only given. It has been shown that by judicious control of energy levels and wave functions one cannot only tailor the wavelength over a wide spectral range but also design the scattering rates and dipole matrix elements to improve the gain, thus lowering the threshold currents. In this paper, we present a complementary investigation that addresses the injector design and, more specifically, the phenomena controlling the electron injection into the active region.