Abstract-Open-path gas detection using terahertz time-domain spectroscopy

D S Sitnikov, S A Romashevskiy, A A Pronkin,  I V Ilina,

http://iopscience.iop.org/article/10.1088/1742-6596/1147/1/012061/meta

We report on the development of an experimental setup for remote sensing of gas atmosphere in open air conditions using broadband terahertz pulses. Terahertz time-domain spectroscopy technique is used to solve the problems of gas detection and recognition in the presence of water vapor absorption lines. Acetonitrile vapors were detected and gas concentration was successfully estimated. Organic crystal with a 2% conversion efficiency pumped with near-infrared femtosecond laser pulses was used to generate single-cycle terahertz pulses with energies up to 10 µJ. Application of a novel high-power source of broadband terahertz radiation (0.2–3 THz) opens up new perspectives for further increasing the open space distances in remote sensing problem.

Abstract-Studying the effect of high-power coherent terahertz pulses on mesenchymal stem cells

D S Sitnikov, I V Ilina, A A Pronkin, A V Ovchinnikov, O V Chefonov, I M Zurina, A A Gorkun,  N V Kosheleva

http://iopscience.iop.org/article/10.1088/1742-6596/1147/1/012060/meta

Question of safety of THz radiation for living objects (starting at the cellular level and ending with the organism in whole) is still a matter of controversy and requires further study. In this paper we present experimental results of studying the effect of terahertz laser pulses on monolayer cell culture. Bone marrow mesenchymal stem cells are exposed to multiple (from 50 to 4200) THz pulses with intensities of about 10 MV/cm. No short-term effect is observed 24 h after cell irradiation.