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We report on the development of a tunable antenna coupled intersubbandterahertz (TACIT) detector based on GaAs/AlGaAs two dimensional electron gas. Asuccessful device design and micro-fabrication process have been developedwhich maintain the high mobility (1.1x106 cm2/V-s at 10K) of a 2DEG channel inthe presence of a highly conducting backgate. Gate voltage-controlled deviceresistance and direct THz sensing has been observed. The goal is to operate asa nearly quantum noise limited heterodyne sensor suitable for passively-cooledspace platforms.

Tunable Antenna Coupled Intersubband Terahertz Detector