Regensburg 2013 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 70: Poster Session: Devices; Preparation and characterization; C/diamond; Si/Ge
HL 70.7: Poster
Wednesday, March 13, 2013, 16:00–20:00, Poster A
Two-photon quantum well infrared photodetectors in the THz regime — •Carsten Franke1, Harald Schneider1, and Martin Walther2 — 1Helmholtz-Zentrum Dresden-Rossendorf — 2Fraunhofer IAF Freiburg
Two-photon quantum well infrared photodetectors (QWIPs) are interesting nonlinear devices for autocorrelation measurements in the mid-infrared and THz-regime. Here, we present first results on two-photon THz-QWIPs with intersubband transition frequencies below 7 THz, based on the GaAs/AlGaAs material system with an aluminium content of 5% and below. We performed dark current measurements and observed large current discontinuities which can be attributed to impact ionisation. We also present photocurrent spectra which show, in addition to the expected intersubband transitions, evidence of further signatures related to optical-phonons.