Terahertz Science And Technology

THz consist of electromagnetic radiations with wavelengths between 30 micron (10 THz) and 3 mm (0.1 THz) therefore being placed in between the Infra-red and microwave regions respectively. Such wavelengths can stimulate the rotational motion of many polar molecules such as H2O (water molecules) and N2 (nitrogen molecules ) and are strongly absorbed by metals. In contrast, THz is practically transparent to many dry organic materials such as plastics and paper.
In addition, the inherent non-ionizing character of THz radiations make them very promising substitutes for state-of-art X-Rays based inspection systems. Another fundamental aspect of THz detection is the possibility of acquiring chemical fingerprints from analytes. This is allowed by the chemo-structural specificity of the rotational energies, which permit the distinction between different chemical species but also between different structures of chemically identical compounds (such as amorphous or crystalline forms of the same protein, for instance).
The combination of chemo-structural specificity, transparency to many common packaging materials, non-ionizing character and strong absorbance from metals and water-containing materials make the implementation of THz technologies incredibly interesting in many different industrial applications, such as for security detectors, crop health monitoring systems, food and pharmaceuticals packaging inspection devices and more.