Terahertz frequency radiation possesses a unique combination of desirable properties for
noninvasive imaging and spectroscopy of materials. This includes the ability to obtain …

This review paper presents the achievements and developments in the optical methods of
antibiotic residues detection. The specific optical methods such as optical immunoassay …

We present a semiconductor injection laser operating in continuous wave with emission
covering more than one octave in frequency and displaying homogeneous power …

Spectroscopy in the terahertz frequency range has demonstrated unique identification of
both pure and military-grade explosives. There is significant potential for wide applications …

We present a directly generated on-chip dual-comb source at terahertz (THz) frequencies.
The multi-heterodyne beating signal of two free-running THz quantum cascade laser …

Advances in ultrafast lasers and semiconductor technologies have facilitated access to the
terahertz (THz) frequency range for spectroscopic and imaging purposes. THz time-domain …

The terahertz (THz) frequency quantum cascade laser (QCL) is a compact source of high-
power radiation with a narrow intrinsic linewidth. As such, THz QCLs are extremely …

Using the high penetrability of the terahertz waves and the characteristic absorption spectra
in this frequency range, we have built a noninvasive mail inspection system targeting drugs …

Generating narrowband, continuous wave FIR/THz light via difference frequency generation
(DFG) remains challenging due to material absorption and dispersion from optical phonons …

This article does not attempt to offer an exhaustive assessment of the current status of
terahertz technology, nor does it endeavour to cover all the anticipated applications of …