Patent ID: 8975584
Filing Date: 2015-03-10
Classification: G01J,G01N

Abstract:
1. A terahertz system for producing and coherently detecting terahertz (THz) radiation, the system comprising: a laser light source and at least two THz antennae that respectively via a fibre optic are optically coupled to the laser light source and are activatable by light of the laser light source, of which a first THz antenna serves as a transmitter antenna and a second THz antenna serves as a receiver antenna, wherein the THz antennae respectively comprise a semiconductor chip that is contacted by antennae conductors and comprises at least one active layer with a band edge wavelength that is larger than a wavelength of the laser light source, and at least one layer that is adjacent the active layer and that has a band edge wavelength that is smaller than the wavelength of the laser light source, wherein the at least one active layer of at least of one of the THz antennae is arranged between two of the adjacent layers and has a thickness that at the most corresponds to a penetration depth of the light of the laser light source, wherein the penetration depth is defined by an intensity drop to a share of 1/e of an incident radiation intensity, and wherein a semiconductor material forming the at least one active layer of at least one of the THz antennae has a band edge wavelength of at least 1600 nm, wherein the band edge wavelength at least of this at least one active layer of at least one of the THz antennae is at least 200 nm larger than the wavelength of the laser light source.