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Terahertz (THz) frequency range (0.1 THz — 3 THz) is the last span within the whole electromagnetic wave spectrum, At the same time it is well known that this frequency range has incredibly fascinating prospects for many applications. THz radiation exhibits three unique properties, which stimulate development of the whole terahertz industry. The major advantage of terahertz waves (of sub-terahertz frequency range 0.1 THz — 0.3 THz) is that many materials which block visible and IR spectra, appear to be transparent in the terahertz region. The terahertz range is a part of the electromagnetic spectrum between microwaves and infrared with a frequency of one billion oscillations per second. The so-called terahertz gap was an issue for many years as there were no practical radiation sources for this part of the spectrum until well into the 1990s. Due to its special properties, terahertz radiation has become an important technology of the future: it can be used to detect concealed explosives or drugs and it can identify which substances are flowing through a plastic pipe. It is capable of monitoring the thickness of a layer in a non-destructive manner and visualizing material flaws in ceramics or plastics. Due to its low energy characteristics, terahertz radiation is non-hazardous for humans and animals. There is practically no limit to the areas in which it can be used. Terahertz (THz) technology are mainly used in Laboratory Research, Medical & Healthcare, Transportation & Public Security and Industrial Non-Destructive Testing (NDT).
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