(via Wiki) Electromagnetic waves sent at terahertz frequencies, known as terahertz radiation, terahertz waves, terahertz light, T-rays, T-light, T-lux and THz, are in the region of the electromagnetic spectrum between 300 gigahertz (3x1011 Hz) and 3 terahertz (3x1012 Hz), corresponding to the submillimeter wavelength range between 1 millimeter (high-frequency edge of the microwave band) and 100 micrometer (long-wavelength edge of far-infrared light).
I found the article Detecting T-rays @ http://www.economist.com/science/tq/displaystory.cfm?story_id=11286550 interesting because of its wide application in various faculties of science and technology + I also believe T-rays could be useful in detecting unique chemical signatures in sophistcated treated/synthetic colored stones and diamonds.
Useful links:
www.nist.gov
www.ieee.org
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