Physics
Scientific paper
Apr 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999spie.3629..155d&link_type=abstract
Proc. SPIE Vol. 3629, p. 155-162, Photodetectors: Materials and Devices IV, Gail J. Brown; Manijeh Razeghi; Eds.
Physics
6
Scientific paper
This paper presents the recent developments of large area focal plane 'pseudo' arrays for infrared (IR) imaging. The devices (called QWIP-LED) are based on the epitaxial integration of an n-type mid-IR (8 - 10 micrometer in the present study) GaAs/AlGaAs quantum well detector with light emitting diode. The originality of this work is to use n-type quantum wells for large detection responsivity. From these structures, very large area (approximately equals cm(superscript 2)) mesas are processed with V-grooves to couple the mid-IR light with the QW intersubband transitions. The increase of spontaneous emission by the mid-infrared induced photocurrent is detected with a CCD camera in the reflection configuration. As demonstrated earlier on p-type QWIP structures the mid-IR image of a blackbody object is up-converted to a near-IR transformed image with very small distortion.
Buchanan Margaret
Chevrette Paul C.
Dupont Emmanuel
Liu Hui C.
St-Germain Daniel
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