A device for detecting electromagnetic radiation, charged particles or
photons including a 2-dimensional electron gas (2DEG) and/or a
2-dimensional hole gas (2DHG). The device detects the collective response
of the plasma to perturbations of the 2DEG and/or the 2DHG. The device is
tunable by using Schottky contacts. The device can be used for high-speed
photodetector devices, terahertz sensors, and charged particle sensors.