The Terahertz laboratories are actively involved in creating new emitters and detection techniques at terahertz frequencies.
Research involving the creation of new THz antennas, particularly antennas that do not require electrical bias signal. Currently, the group is focussing on antennas that utilise the lateral photo-Dember effect, where the diffusion of photo-excited carriers is responsible for the emitted THz waves.
Terahertz quantum cascade lasers (THz-QCLs) are promising sources of THz frequency waves. While the research surrounding the commercial deployment of QCLs as THz sources is in its infancy, our group is working on using a QCL’s active region as an amplifier of THz signals.
A THz polariton “laser” is a THz source that relies on nonlinear conversion of a semiconductor band-gap emission wavelength using polaritons. A polariton is a photon strongly-coupled to an electron-hole pair, which is typically achieved using a microcavity. Whilst it does not utilise stimulated emission to amplify light, the resulting emission exhibits all the properties of light commonly associated with laser light, including coherence and narrow linewidth.