title: Terahertz two-photon quantum well infrared photodetector.
abstract: A two-photon detector based on intersubband transitions in GaAs/AlGaAs quantum wells operating in the Terahertz regime below the Reststrahlenband is reported. Resonantly enhanced optical nonlinearities enables sensitive quadratic detection at pJ pulse energies. We demonstrate its use in a quadratic autocorrelator for far-infrared picosecond pulses at around 7 THz.
authors: Forschungszentrum Dresden Rossendorf, Institute of Ion Beam Physics and Materials Research, P O Box 510119, D-01314 Dresden, Germany. h.schneider@fzd.de
authors: H
authors: H
authors: Schneider
authors: H C
authors: HC
authors: Liu
authors: S
authors: S
authors: Winnerl
authors: C Y
authors: CY
authors: Song
authors: M
authors: M
authors: Walther
authors: M
authors: M
authors: Helm
mesh_terms: D004583:Electrons; D007368:Interferometry / Q000379:methods; D007834:Lasers; D008962:Models, Theoretical; D055095:Optics and Photonics; D017785:Photons; D010825:Physics / Q000379:methods; D011789:Quantum Theory; D012666:Semiconductors; D017550:Spectroscopy, Fourier Transform Infrared; D013997:Time Factors