The Governors of the University of Alberta

Published purpose

Terahertz (THz) radiation is a form of electromagnetic energy that occupies a broad frequency band between 0.1 and 10 THz, and is non-ionizing. These frequencies coincide with natural dynamics of biological systems, including low-frequency vibrational modes of large molecules (e.g., all proteins, DNA) and the stretching/twisting modes of hydrogen bond networks that are ubiquitous in biological systems. This interaction mechanism is the basis behind existing novel THz diagnostic imaging technologies for which the high sensitivity to molecular/chemical structure provides excellent contrast between diseased and healthy tissue. However, exposure to higher levels of THz radiation can also affect the structure and function of target biomolecules. This project investigates these effects of intense terahertz radiation in proteins, cells, and skin tissue. The Ultrafast Nanotools lab, houses the source of terahertz radiation and sample chambers that will be used to perform biological exposure studies. This is central to the proposed research, as sufficient radiation sources of the type required for these investigations are not commercially available. The state-of-the-art sources of intense terahertz pulses constructed for research purposes are known to be capable of generating peak electric fields and intensity distributions sufficient to induce significant non-thermal biological effect in target samples, as reported in several academic publications.