Abstract

The development of technologies in the terahertz spectrum or the very-far-infrared region has been slow mainly because of lack of convenient detectors and lasers. We report on the design and simulated performance of quantum-well photodetectors for the terahertz (1 - 10 THz). Quantum well, barrier, and doping parameters are optimized in terms of operating temperature, absorption, and detectivity. We also report on our experimental demonstration of GaAs/AlGaAs photodetectors with background limited infrared performance (BLIP). These devices are suited for a variety of applications, especially in conjunction with the newly developed THz quantum cascade lasers. One of such example is THz free space communication.

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