Terahertz radiation

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Terahertz radiation – also known as terahertz waves, tremendously high frequency (THF), T-rays, T-waves, T-light, or T-lux– consists of electromagnetic waves within the frequency band from 0.1 to 10 terahertz (symbol THz), as designated by the International Telecommunication Union (ITU). One terahertz is 1012 Hz or 1,000 GHz. Wavelengths of terahertz radiation range from 3 millimeters and 30 micrometers (3 mm = 3000 μm to 30 μm), sometimes known as the submillimeter band, and its radiation as submillimeter waves, especially in astronomy. This band of electromagnetic radiation lies within the transition region between microwave and far infrared and can be regarded as either. Compared to lower radio frequencies, terahertz radiation is strongly absorbed by the gases of the atmosphere, and in air, most of the energy is attenuated within a few meters, so it is not practical for long distance terrestrial radio communication. It can penetrate thin layers of materials but is blocked by thicker...

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