Voltage tunable two-color infrared detection using semiconductor superlattices

Majumdar, Amlan; Choi, K.K.; Reno, J.L.; Tsui, D.C.
December 2003
Applied Physics Letters;12/22/2003, Vol. 83 Issue 25, p5130
Academic Journal
We demonstrate a voltage tunable two-color quantum-well infrared photodetector (QWIP) that consists of multiple periods of two distinct AlGaAs/GaAs superlattices separated by AlGaAs blocking barriers on one side and heavily doped GaAs layers on the other side. The detection peak switches from 9.5 μm under large positive bias to 6 μm under negative bias. The background-limited temperature is 55 K for 9.5 μm detection and 80 K for 6 μm detection. We also demonstrate that the corrugated-QWIP geometry is suitable for coupling normally incident light into the detector. © 2003 American Institute of Physics.


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