Two-photon quantum well infrared photodetectors below 6 THz
2014; Elsevier BV; Volume: 70; Linguagem: Inglês
10.1016/j.infrared.2014.08.012
ISSN1879-0275
AutoresCarsten Franke, Martin Walther, M. Helm, H. Schneider,
Tópico(s)Photonic and Optical Devices
ResumoTwo-photon quantum well infrared photodetectors (QWIPs) are nonlinear detectors for the mid-infrared and terahertz regimes optimized for resonant two-photon absorption. Here we present first results on two-photon QWIP samples based on the GaAs/AlGaAs material system with intersubband energies between 25 and 12 meV (6–3 THz) confirmed by photocurrent spectra. The dark current showed large discontinuities, presumably caused by impact ionization. We performed interferometric autocorrelation experiments at the free-electron laser FELBE and observed nonlinear interferograms for all samples.
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