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We report on time-resolved photoluminescence of excitons and electron-hole plasma in GaAs quantum wells under intraband excitation by a free-electron laser in resonance with intersubband and intraexcitonic transitions, respectively, to study relaxation and intraexcitonic scattering.
We present a magneto-transmission experimental set up covering the spectral region from 5 to 120 μm. Interchangeable quantum cascade lasers are used as excitation sources. The performance of the setup is illustrated via cyclotron resonance studies of InGaAs/GaAs QWs under magnetic fields up to 60T.
We investigate nonlinear optics related to the intra-excitonic 1s-2p heavy-hole transition in GaAs/AlGaAs quantum wells. Tuning intense terahertz (THz) light around this resonance we report (i) efficient second order sideband generation and (ii) first clear evidence of the Autler-Townes effect.
We report on scalable photoconductive antennas for both emission and detection of terahertz (THz) radiation. The concept yields THz emitters with high efficiencies for the conversion of near-infrared into far-infrared radiation, and provides detectors that do not require tight focusing of both the THz beam and the near-infrared gating beam. GaAs substrates implanted with dual energy implants of N+...
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