Acoustic phonon generation and detection in GaAs/Al0.3Ga0.7As quantum wells with picosecond laser pulses
Acoustic phonon generation and detection in GaAs/Al0.3Ga0.7As quantum wells with picosecond laser pulses
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DOI：
10.1103/physrevb.71.115330
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发表时间：
2005-03
影响因子：
3.7
通讯作者：
O. Matsuda;T. Tachizaki;T. Fukui;J. Baumberg;O. Wright
中科院分区：
文献类型：
--
作者：
O. Matsuda;T. Tachizaki;T. Fukui;J. Baumberg;O. Wright
利用干涉光泵浦探测技术，研究了三个不同厚度的GaAs/Al_（0.3）Ga_（0.7）As量子威尔斯阱样品中皮秒声-声子脉冲的产生和探测。通过每个阱的hh 1-e1跃迁调谐泵浦光子能量，并且选择探测光子能量以允许在样品表面处检测声子脉冲。声子脉冲的形状解释与载波函数的声学应变，和检测到的光学反射率和相位变化的声学应变的模型。
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.