Semiconductor- and carbon-devices for innovative nanoscale THz sensors and imagers

We present terahertz (THz) sensing and imaging technologies based on a carbon nanotube (CNT) and a two-dimensional electron gas (2DEG) in a GaAs/AlGaAs heterostructure. The unique properties of CNT quantum dots have led to the development of a highly sensitive and frequency-selective THz detector. Using the 2DEG THz detector, we have developed a THz near-field imager in which all the components: an aperture, a probe, and a THz detector are integrated on one GaAs/AlGaAs chip. This scheme allows highly sensitive, high-resolution detection of the evanescent field alone.