Optically coupled quantum well infrared detectors

Wen-Gang Wu; Liqiu Cui; De Sheng Jiang; Wei Liu; Chunying Song

doi:10.1117/12.252084

25 September 1996 Optically coupled quantum well infrared detectors

Wen-Gang Wu, Liqiu Cui, De Sheng Jiang, Wei Liu, Chunying Song

Proceedings Volume 2894, Detectors, Focal Plane Arrays, and Applications; (1996) https://doi.org/10.1117/12.252084
Event: Photonics China '96, 1996, Beijing, China

Abstract

This paper proposes and demonstrates for the first time a novel optically-coupled quantum well infrared detector for conversion of mid or far infrared radiation into near infrared radiation. It is in fact the monolithic integration of a GaAs/A1GaAs multiple quantum well intraband photodetector (QWIP) and an InGaAs/GaAs quantum well resonant cavity light emitting diode (RCLED) in which the active region is sandwiched in between a GaAs/AlAs quarter wave n-type distributed Bragg reflector (DBR) and a GaAs/AlGal\As/A1As/AlXGal\As quarter wave p-type DBR. Experimental results show that this new optoelectronic device exhibits an impressive external efficiency because of Fabry-Perot resonance microcavity enhancement and mode-coupling effects in the RCLED, and that its internal efficiency of the photon energy conversion is about unity for high quality InGaAs/GaAs quantum wells. Since near infrared detectors normally have much higher detectivity values than those for far infrared detectors, the proposed detector, demonstrated here by a one-dimensional array, should be easy to scale up into large two-dimensional focal plane arrays (FPAs) and suitable for thermal imaging application using optical interconnection directly. This new unique approach combines the recently developed vertical-cavity surface emitting laser (VCSEL) technology with the newly established QWIP technology both based on GaAs and related epitaxially grown alloys, such as A1GaAs and InGaAs. Its advantage over conventional approach, usually applying an InSb or a HgCdTe detectorarray hybrid bonded to a Si chip for multiplexing, is that it uses a mature materials system and avoids hybrid bonding and any thermal mismatch.

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Wen-Gang Wu, Liqiu Cui, De Sheng Jiang, Wei Liu, and Chunying Song "Optically coupled quantum well infrared detectors", Proc. SPIE 2894, Detectors, Focal Plane Arrays, and Applications, (25 September 1996); https://doi.org/10.1117/12.252084

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KEYWORDS

Quantum wells

Sensors

Infrared detectors

Infrared sensors

Quantum optics

Energy efficiency

Far infrared

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