Journal
APPLIED PHYSICS LETTERS
Volume 80, Issue 11, Pages 1936-1938Publisher
AMER INST PHYSICS
DOI: 10.1063/1.1461429
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The ultrafast optical response of low-temperature-grown GaInAs/AlInAs multiple quantum wells is studied in pump-probe experiments with a femtosecond Er:fiber laser. As-grown samples doped with beryllium (concentration of 8x10(17) cm(-3)) display a nonlinear transmission change, which decays by carrier trapping with a time constant of 230 fs. Experiments with pairs of ultrashort pulses separated by 1.5 ps demonstrate a fast modulation of transmission and very small accumulation effects, making this material highly promising for all-optical switching. Substantially longer recovery times are found in annealed, Be-doped samples and in undoped samples. (C) 2002 American Institute of Physics.
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