Scherbakov A V, Bombeck M, Jäger J V, Salasyuk A S, Linnik T L, Gusev V E, Yakovlev D R, Akimov A V, Bayer M
Ioffe Physical-Technical Institute, Russian Academy of Sciences, 194021 St Petersburg, Russia.
Opt Express. 2013 Jul 15;21(14):16473-85. doi: 10.1364/OE.21.016473.
By means of a metal opto-acoustic transducer we generate quasi-longitudinal and quasi-transverse picosecond strain pulses in a (311)-GaAs substrate and monitor their propagation by picosecond acoustic interferometry. By probing at the sample side opposite to the transducer the signals related to the compressive and shear strain pulses can be separated in time. In addition to conventional monitoring of the reflected probe light intensity we monitor also the polarization rotation of the optical probe beam. This polarimetric technique results in improved sensitivity of detection and provides comprehensive information about the elasto-optical anisotropy. The experimental observations are in a good agreement with a theoretical analysis.
通过一个金属光声换能器，我们在（311）-砷化镓衬底中产生准纵向和准横向皮秒应变脉冲，并通过皮秒声学干涉测量法监测它们的传播。通过在与换能器相对的样品侧进行探测，与压缩应变脉冲和剪切应变脉冲相关的信号可以在时间上分离。除了传统的监测反射探测光强度外，我们还监测光学探测光束的偏振旋转。这种偏振测量技术提高了检测灵敏度，并提供了关于弹光各向异性的全面信息。实验观测结果与理论分析吻合良好。
