Six years after their birth, terahertz quantum-cascade lasers can now deliver milliwatts or
more of continuous-wave coherent radiation throughout the terahertz range—the spectral …

Quantum cascade lasers are unipolar semiconductor lasers covering a wide range of the
infrared and terahertz spectrum. Lasing action is achieved by using optical intersubband …

Free space optics data transmission with bitrate in excess of 10 Gbit s− 1 is demonstrated at
9 µm wavelength by using a unipolar quantum optoelectronic system at room temperature …

We present a quantum description of a planar microcavity photon mode strongly coupled to
a semiconductor intersubband transition in presence of a two-dimensional electron gas. We …

The terahertz (THz) quantum cascade laser (QCL), first demonstrated in 2002, is among the
most promising radiation sources in the THz region owing to its high output power and broad …

We present a full quantum theory for the dissipative dynamics of an optical cavity in the
ultrastrong light-matter coupling regime, in which the vacuum Rabi frequency is a significant …

A unipolar injection quantum cascade (QC) laser grown in an AlGaAs/GaAs material system
by molecular beam epitaxy, is reported. The active material is a 30 period sequence of …

This paper gives an overview on the design, fabrication, and characterization of quantum
cascade detectors. They are tailorable infrared photodetectors based on intersubband …

In this paper we review recent progress in obtaining laser action from semiconductor
quantum cascade structures covering the low THz region of the electromagnetic spectrum …

The phenomenon of electromagnetically induced quantum coherence is demonstrated
between three confined electron subband levels in a quantum well which are almost equally …