Extending the spectral range of THz quantum cascade lasers

Sammanfattning

Recently, substantial progress has been made on the temperature performance of Terahertz Quantum Cascade Lasers (THz QCLs) around frequencies of 4 THz. The project shall study whether similar results can be obtained in a wider spectral range. For this purpose, detailed simulations were performed based on the nonequilibrium Green’s function model developed earlier in the group. The main issue is to identify which features limit the performance of THz QCLs. This thesis work is theoretical, the results of the studies are compared to experimental measurements when this is possible.