Plasma nonlinearities and terahertz detection by Field Effect Transistors

On overview of recent results concerning the plasma excitations in Field Effect Transistor is presented. We report on high magnetic field studies and we show evidences that the plasma waves are indeed propagating in the transistor channel. We show also how FET based THz detectors parameters can be determined using the static current voltage characteristics. The role of loading effects and temperature to enhance the THz responsivity is also demonstrated.