Tunable, unipolar, near-infrared intraband optical gain is demonstrated in semiconductor
colloidal quantum wells, expanding the form and optical range for potential infrared …

We review the methods that have been used for suppressing non-radiative processes in mid-
infrared (MIR) semiconductor lasers and detectors. Specifically we discuss the results of …

Population inversion in inter-subband emitters and lasers depends critically on the lifetimes
of the nonradiative inter-subband transitions. We find that the often neglected Auger-type …

We study radiative relaxation at terahertz frequencies in n-type Ge/SiGe quantum wells,
optically pumped with a terahertz free electron laser. Two wells coupled through a tunneling …

Intersubband carrier lifetimes and population ratios are calculated for three-and four-level
optically pumped terahertz laser structures. Laser operation is based on intersubband …

n-type doped Ge quantum wells with SiGe barriers represent a promising heterostructure
system for the development of radiation emitters in the terahertz range such as electrically …

Recently intersubband semiconductor lasers have been of great interest for mid-infrared
device applications. Stimulated emission in a unipolar intersubband laser has been …

There are numerous possible applications in both imaging and wireless communications for
a compact solid-state source of terahertz radiation. The use of asymmetric or stepped …

We show that self-consistent simulations of asymmetric coupled double-quantum wells
(ACQW) can be used efficiently to increase significantly the optical performances of optically …

Both theoretical and experimental results on interband and photoinduced intersubband
absorption in undoped type-II InAs/AlSb heterostructures are reported. The observation of …