"JOURNAL OF RADIO ELECTRONICS" (Zhurnal Radioelektroniki ISSN 1684-1719, N 11, 2017

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Methods and devices of high resolution terahertz spectroscopy for analytical applications

 

V. L.Vaks, E. G. Domracheva, M. B.  Chernyaeva

Institute for Physics of Microstructures RAS, 603950, Nizhny Novgorod, GSP-105

 

The paper is received on November 14, 2017

 

Abstract. This paper is devoted to using high resolution microwave and terahertz spectroscopy for solving various problems of analytical chemistry, biology, medicine, astrophysics, safety etc. The main types of devices for high resolution terahertz spectroscopy are described. Spectrometers with phase switching and fast frequency sweeping as well as radiation sources based on microwave generators with frequency multiplying, backward wave oscillator, quantum cascade lasers are presented. The two-channel THz spectrometer and combined subTHz-THz-IR spectrometer as a new analytical tool are proposed. Some experimental results of using the high resolution terahertz spectroscopy for various analytical applications are cited. The results of exhaled breath spectroscopic investigations for non-invasive medical diagnostics of diabetes and other diseases, as well as for monitoring the efficiency of radiotherapy on dynamics of NO concentration are presented. The results of studying the THz absorption spectra for gaseous phase of high energy substances and products of their natural and thermal decomposition have been presented. The decomposition products, being potential markers for detecting the high energy substances in atmosphere in real-time mode, have been revealed. The special consideration is given to improving the sensitivity of terahertz spectral analysis. The development of semiconductor technology will allow to achieve a high level for production of the radiation sources and detectors for terahertz spectroscopy. Developing the tiny and easy-to-use devices based on semiconductor electronics being combined radiation sources for different frequency ranges may be a new direction of devices design. This may result in a new analytical method of spectral analysis for fundamental and applied research.

Key words: high resolution terahertz spectroscopy, quantum cascade laser, multicomponent gas mixture, absorption spectrum.

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For citation:

V.L.Vaks, E.G.Domracheva, M.B.Chernyaeva. Methods and devices of high resolution terahertz spectroscopy for analytical applications. Zhurnal Radioelektroniki - Journal of Radio Electronics, 2017, No. 11. Available at http://jre.cplire.ru/jre/nov17/14/text.pdf. (In Russian)