Terahertz filter could harness unused spectrum
March 30, 2007 | Source: NewScientist.com news service
A “metamaterial” that selectively filters terahertz radiation could perhaps be used for short-range wireless communications.
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 partly regular sub-wavelength structural features.