The electromagnetic waves found in the spectrum between microwaves and infra-red light with a frequency of approximately 300 GHz to 10 Terahertz (wavelengths of 1 mm to 30 mm).
In addition to fast data communication and measuring applications in atmospheric research and astrophysics, new imaging methods are just one of the future areas of application for this segment of the spectrum.
Scientists are working on a method of making the content of books visible without having to open them.
This work is intended to make it possible to look at manuscripts that are already so damaged that opening them would destroy them completely.