Detection of Terahertz Radiation from Submicron Plasma Waves Transistors

Terahertz detection using Si-SiGe MODFETs

“…Terahertz photon helicity sensitive photoresponse has been reported recently in similar devices [17] and was explained as due to the interferences of the plasma oscillations in the channel. In terms of application, terahertz imaging has been demonstrated by using this device as a sensor [3]. To enhance the responsitivity of this device, new structures like asymmetric dual grating gate based on silicon technology is under investigation.…”

“…The attractive features of THz radiation are: (i) It is transmitted by clothes and most packaging materials such as paper or plastics, (ii) Many substances have "fingerprint" spectra in the THz range (iii), Due to its low photon energy (about one million times less than X-rays) THz radiation is non-ionizing and therefore not dangerous for the human beings. Thanks to all those capabilities, THz systems are a promising tool for spectroscopy and imaging applications as well as future ubiquitous communication networks [1]- [3].…”