Resonant two-photon photoemission in quantum-well infrared photodetectors

Maier, Thomas; Schneider, Harald; Walther, Martin; Koidl, Peter; Hui Chun Liu
June 2004
Applied Physics Letters;6/21/2004, Vol. 84 Issue 25, p5162
Academic Journal
We report the nonlinear behavior of quantum-well infrared photodetectors with three energetically equidistant energy levels. The giant resonant nonlinearity leads to a quadratic power dependence of the photocurrent down to excitation power densities as low as 0.1 W/cm2. Using these highly sensitive two-photon detectors, second-order autocorrelation measurements of ultrashort midinfrared laser pulses in the pJ regime are demonstrated. The dynamical behavior is studied by a numerical analysis of these measurements. At high bias voltages we observe a dominating linear contribution to the photocurrent arising from tunneling processes.


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