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Influence of optical interference on quantum well infrared photodetectors in a 45 deg waveguide geometry

Optische Interferenz in Quantumwell-Infrarot-Photodetektoren mit 45 Grad Facettengeometrie
: Schneider, H.; Schönbein, C.; Koidl, P.; Weimann, G.


Applied Physics Letters 74 (1999), No.1, pp.16-18 : Ill., Lit.
ISSN: 0003-6951
ISSN: 1077-3118
Journal Article
Fraunhofer IAF ()
GaAs/AlGaAs; interference; Interferenz; quantum well infrared photodetector; QWIP

Standing light waves caused by the interference of incident and reflected beams lead to a spatial modulation of the electromagnetic field within the active region of a quantum well infrared photodetector (QWIP). The optical excitation-determined by the electric field component perpendicular to the quantum well plane-is thus inhomogeneous, influencing the QWIP responsivity and its voltage dependence. The inhomogeneity can be suppressed by using mesa photodetectors where only half of the top contact is covered with metal.