The technological solutions and optical configurations employed to tune the emission
frequency of quantum cascade lasers (QCLs) operating in the Terahertz range are reviewed …

We combine photonic crystal and quantum cascade band engineering to create an in-plane
laser at terahertz frequency. We demonstrate that such photonic crystal lasers strongly …

The terahertz (THz) quantum cascade laser (QCL) is a coherent THz source based on
intersubband transitions of unipolar carriers. As semiconductor lasers, THz QCLs are solid …

As semiconductor devices, the terahertz quantum-cascade laser is a coherent source based
on intersubband transitions of unipolar carriers while the terahertz quantum-well …

We demonstrate high spectral control from surface emitting THz Quantum Cascade Lasers
based on a two-dimensional photonic crystal cavity. The perforated top metallic contact acts …

Terahertz (THz) quantum-cascade lasers (QCLs) are currently unparalleled for high-
resolution spectroscopy of very sharp absorption lines (linewidths below 100 MHz) in the …

We present the design and the realization of active photonic crystal (PhC) semiconductor
lasers. The PhC consists of semiconductor nanostructure pillars which provide gain at a …

A hybrid GaAs quantum cascade laser system obtained by Au–Au thermocompression
bonding epilayer down onto gold coated silicon substrates is presented in this paper. The …

We report on micropillar-based terahertz lasers with active pillars that are much smaller than
the emission wavelength. These micropillar array lasers correspond to scaled-down band …

We investigate terahertz quantum cascade lasers with a dense array of active micropillars
forming the gain medium. Depending on the size of these pillars relative to the emission …