Terahertz filter

A "metamaterial" that selectively filters terahertz radiation could perhaps be used for short-range wireless communications. Terahertz (THz) radiation exists between radio and infrared in the electromagnetic spectrum. It passes through clothing but is reflected by metals and explosives, making it potentially useful for security scanning.Using terahertz waves for communications would make an unused region of the electromagnetic spectrum available. The high frequency of the waves means they could also transfer wireless data very rapidly. However, the waves are normally beyond the influence of traditional optical and electronics devices. The device is essentially a sheet of metal foil incorporating a carefully designed pattern of holes. It is a so-called metamaterial, since it interacts with electromagnetic waves in novel ways, thanks to sub-wavelength structural features.

Source: newscientist.comAdded: 11 April 2007