Dresden 2014 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 108: Poster: Ultra-fast phenomena / Optical properties / Semiconductor laser / Devices and device concepts
HL 108.6: Poster
Thursday, April 3, 2014, 17:00–20:00, P1
Terahertz two-photon quantum well infrared photodetectors — •Carsten Franke1,2, Harald Schneider1, and Martin Walther3 — 1Helmholtz-Zentrum Dresden-Rossendorf — 2TU Dresden — 3Fraunhofer IAF Freiburg
Two-photon quantum well infrared photodetectors (QWIPs) are nonlinear detectors for the investigation of ultrashort pulses in the mid-infrared and THz-regime. In these devices the photocurrent shows a quadratical dependence on the intensity of the incoming radiation which is useful in autocorrelation experiments.
We are currently investigating two-photon QWIPs based on the GaAs/AlGaAs material system with an aluminum content lower than 5% in the barrier, which leads to intersubband absorption energies below 25 meV.
Here we present results of interferometric autocorrelation experiments performed with the free-electron laser FELBE at photon energies of 15 to 25 meV.