Journal
OPTICS LETTERS
Volume 30, Issue 3, Pages 287-289Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.30.000287
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We report on two-photon detection based on nonlinear absorption between subbands in quantum wells. Resonantly enhanced nonlinear absorption, 6 orders of magnitude higher than that of typical bulk semiconductors, leads to a threshold power density for quadratic detection as low as 0.1 W/cm(2) and to femtosecond time resolution. The approach facilitates dynamic characterization of the optical light field of infrared emitters with unprecedented sensitivity. We also present a new method for determining the intersubband and intrasubband scattering times by means of autocorrelation measurements. (C) 2005 Optical Society of America.
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