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Quantum-Well Infrared Photodetector Works

Photonics Spectra
Nov 2000
A research team from Georgia State University in Atlanta, the National Research Council's Institute for Microstructural Sciences in Ottawa and Cornell University in Ithaca, N.Y., has produced a GaAs/InGaAs quantum-well infrared photodetector that may challenge the dominance of germanium sensors in the far-IR. Far-IR detectors have applications in astronomy and satellite mapping.

The team, which reported its work in the July 31 issue of Applied Physics Letters, produced the new photo-detector by molecular beam epitaxy and wet chemical etching of the GaAs barriers and InGaAs wells. The sensor displayed a cutoff at 35 µm and a peak responsivity of 0.45 A/W at 31 µm under experimental conditions at 4.2 K.

GLOSSARY
astronomy
The scientific observation of celestial radiation that has reached the vicinity of Earth, and the interpretation of these observations to determine the characteristics of the extraterrestrial bodies and phenomena that have emitted the radiation.
astronomyBasic ScienceResearch & TechnologySensors & DetectorsTech Pulse

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