Open AccessTerahertz two-photon quantum well infrared photodetector
Author(s) -
Harald Schneider,
H. C. Liu,
Stephan Winnerl,
Chunying Song,
M. Walther,
Manfred Helm
Publication year - 2009
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.17.012279
Subject(s) - autocorrelator , picosecond , terahertz radiation , photodetector , optics , infrared , optoelectronics , physics , photon , detector , quantum well , photon counting , photoexcitation , materials science , laser , atomic physics , excited state
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.