Improving the output beam of Terahertz QCLs

The CNRS-LPA partner has demonstrated, in a new publication in Optics Express, a simple method to engineer the beam profile of a Terahertz QCLs. The far-field emission metal-metal QCLs is controlled in directionality and form through planar horn-type shape structures, whilst conserving a broad spectral response. The structures produce a gradual change in the high modal confinement of the waveguides and permit an improved far-field emission profile and resulting in a four-fold increase in the emitted output power. Full details can be found here