Terahertz two-photon quantum well infrared photodetector.
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.
Schneider
H
H
Forschungszentrum Dresden Rossendorf, Institute of Ion Beam Physics and Materials Research, P O Box 510119, D-01314 Dresden, Germany. h.schneider@fzd.de
Liu
H C
HC
Winnerl
S
S
Song
C Y
CY
Walther
M
M
Helm
M
M
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