HIGH-PRECISE SPECTROMETRY OF THE TERAHERTZ FREQUENCY RANGE: THE METHODS, APPROACHES AND APPLICATIONS

The application of the microwave approach to development of the terahertz (THz) frequency range has resulted in elaboration of precise methods and devices for various applications. The key point of the development was employment of mixers and multipliers based on the quantum semiconductor superlattice structures, which provide more effective signal transformation in comparison with commonly used devices on Schottky diodes. As a result the unique family of the frequency synthesizers based on the backward wave oscillators operating in the frequency range of 667 ÷ 1100 GHz was designed and elaborated. Besides, application of the non-stationary microwave spectroscopy together with nanoelectronics devices yielded a solid state spectrometer of the THz frequency range, operating in a phase switching mode. The high sensitivity and spectral resolution let one employ the spectrometer for various applications. The results of the spectrometer applications for various problems of medicine and biology, as well as for hi-tech and security systems are also presented.

Keywords:
terahertz frequency range, non-stationary microwave spectroscopy, quantum semiconductor superlattices, phase switching of the frequency, sensitivity, spectral resolution.  
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HIGH-PRECISE SPECTROMETRY OF THE TERAHERTZ FREQUENCY RANGE: THE METHODS, APPROACHES AND APPLICATIONS