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Picosecond acoustic-phonon pulse generation and detection is investigated in a sample containing three GaAs/Al0.3Ga0.7As quantum wells of different thickness with an interferometric optical pump and probe technique. The pump photon energy is tuned through the hh1-e1 transitions of each well and the probe photon energy is chosen to allow the detection of the phonon pulses at the sample surface. The phonon pulse shapes are explained with a model that relates the carrier wave functions to the acoustic strain, and the acoustic strain to the detected optical reflectance and phase changes

physical review b

Acoustic phonon generation and detection in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>GaAs</mml:mi><mml:mo>∕</mml:mo><mml:msub><mml:mi>Al</mml:mi><mml:mn>0.3</mml:mn></mml:msub><mml:msub><mml:mi>Ga</mml:mi><mml:mn>0.7</mml:mn></mml:msub><mml:mi>As</mml:mi></mml:mrow></mml:math>quantum wells with picosecond laser pulses

Acoustic phonon generation and detection inGaAs∕Al0.3Ga0.7Asquantum wells with picosecond laser pulses