Dresden 2014 – wissenschaftliches Programm

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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

Donnerstag, 3. April 2014, 17:00–20:00, P1

Terahertz two-photon quantum well infrared photodetectors — •Carsten Franke1,2, Harald Schneider1, and Martin Walther31Helmholtz-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.

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