Many Body Theory of the Coupling of THz Radiation with Intersubband Excitations in GaAs/AlGaAs Quantum Well

The coupling of THz and Mid Infrared Radiation (TERA-MIR) with an optical excitation in semiconductor microcavities is the subject of increasing research interest. This can be attributed to their important in device’s implementations and applications such as THz imaging, spectroscopy and detection of biological, explosive and hazardous materials. In this paper, we investigated the coupling of TE- THz mode with an intervalence band transition in GaAs/Al0.3Ga0.7As multiple quantum wells embedded in microcavities. Using mathematical modeling and numerical approach, applied to the valence subbands, the optical absorption of the model multiple quantum wells embedded in a microcavity resonator was determined. Simulation results for different carrier densities and dephasing are computed. The result shows clearly the influences dephasing and scattering mechanism as well as Coulomb’s interactions on the energy dispersion of the terahertz Polari tonics.