Tremendously high frequency is a band designation used by some authors to refer to a decade band in the submillimeter radiation/terahertz radiation

Terahertz radiation

In physics, terahertz radiation refers to electromagnetic waves propagating at frequencies in the terahertz range. It is synonymously termed submillimeter radiation, terahertz waves, terahertz light, T-rays, T-waves, T-light, T-lux, THz...

 range. It follows the ITU EHF

EHF

EHF may stand for:* EHF – therapy * Extremely High Frequency, a radio frequency band* Ebola hemorrhagic fever, an illness* European Handball Federation, the European governing body for handball...

 band in increasing frequency order.

THF runs the range

Range

-In mathematics:* Range , the set of all output values produced by a function* Interval , also called a range, a set of real numbers that includes all numbers between any two numbers in the set...

 of frequencies from 300 gigahertz to 3 terahertz, lying in the low (or far) infrared

Infrared

Infrared light is electromagnetic radiation with a wavelength longer than that of visible light, measured from the nominal edge of visible red light at 0.74 micrometres , and extending conventionally to 300 µm...

 range of the electromagnetic spectrum

Electromagnetic spectrum

The electromagnetic spectrum is the range of all possible frequencies of electromagnetic radiation. The "electromagnetic spectrum" of an object is the characteristic distribution of electromagnetic radiation emitted or absorbed by that particular object....

. The wavelength

Wavelength

In physics, the wavelength of a sinusoidal wave is the spatial period of the wave—the distance over which the wave's shape repeats.It is usually determined by considering the distance between consecutive corresponding points of the same phase, such as crests, troughs, or zero crossings, and is a...

in this band varies from one to one tenth of a millimetre.