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Detection of coherent acoustic phonons by time-resolved second-harmonic generation

机译:时间分辨二次谐波检测相干声子

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摘要

We report on observation of coherent longitudinal acoustic phonons in Fe/AlGaAs (001) heterostructure by time-resolved second-harmonic generation (TRSHG). The phonon induces not only a fast and highly damped oscillatory signal but also a long-lived one that exhibits an oscillating period identical to that obtained from the reflectivity measurement. The long-lived oscillatory second-harmonic generation is generated by an electric field modulated at 42.5 GHz because of the interference of the incident beam and the reflected light by the propagating phonon. TRSHG lets us probe the internal field modulated by phonons and differentiate their impacts at the interface and in the bulk.
机译:我们报告了通过时间分辨的二次谐波产生(TRSHG)观察到Fe / AlGaAs(001)异质结构中相干纵向声子的现象。声子不仅会产生快速且高阻尼的振荡信号,还会产生寿命长的信号,该信号的振荡周期与从反射率测量获得的振荡周期相同。由于入射声束和传播的声子的反射光的干扰,在42.5 GHz调制的电场会产生长寿命的振荡二次谐波。 TRSHG使我们能够探测声子调制的内部场,并区分它们对界面和整体的影响。

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  • 来源
    《Physical review》 |2011年第21期|p.212302.1-212302.4|共4页
  • 作者单位

    Department of Applied Science, College of William & Mary, Williamsburg, VA 23185, USA,Department of Optical Science and Engineering, Key Laboratory of Micro and Nano Photonic Structures(Ministry of Education), Fudan University, Shanghai 200433, P. R. China;

    Department of Applied Science, College of William & Mary, Williamsburg, VA 23185, USA;

    Department of Applied Science, College of William & Mary, Williamsburg, VA 23185, USA;

    Naval Research Laboratory, Washington, DC 20375, USA;

    Naval Research Laboratory, Washington, DC 20375, USA;

    Naval Research Laboratory, Washington, DC 20375, USA;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    frequency conversion; harmonic generation, including higher-order harmonic generation;

    机译:变频;谐波产生;包括高次谐波产生;

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