Even though already in the seventies, right after the invention of the quantum cascade laser
(QCL) concept, it was argued that this device could be operated in the THz (far-infrared) …

Quantum cascade lasers (QCLs) are high-power sources of coherent radiation in the
midinfrared and terahertz (THz) bands. Laser feedback interferometry (LFI) is one of the …

Detailed simulations for terahertz quantum cascade lasers based on two-well designs are
presented. We reproduce the maximal operation temperatures observed and attribute the …

We present a two-quantum well THz intersubband laser operating up to 192 K. The structure
has been optimized using non-equilibrium Green's function model. The result of this …

Theoretical predictions indicate that the n-type Ge/Si-Ge multi-quantum-well system is the
most promising material for the realization of a Si-compatible THz quantum cascade laser …

We use Bayesian optimization algorithms in combination with a nonequilibrium Green's
function transport model to increase the maximum operating temperature of terahertz …

We investigate the impact of interface roughness (IFR) scattering on the performance of a
series of the state-of-the-art GaAs/Al x Ga 1-x As terahertz quantum cascade lasers (THz …

In this work, we investigate the effective background charge density in intrinsic Si 0.06 Ge
0.94/Ge plastically relaxed heterostructures deposited on Si (001). Hall effect measurements …

In this work, we investigate the effects of n and p-type background doping, interface
composition diffusion (interdiffusion) of the barrier material and layer thickness variation …

Quantum cascade lasers (QCLs) are generally designed to avoid negative differential
conductivity (NDC) in the vicinity of the operation point in order to prevent instabilities. We …