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Photoexcited elastic waves in free-standing GaAs films

机译:在自由静态的GaAs电影中采用光孔弹性波浪

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摘要

Results of a theoretical and experimental investigation of the spatiotemporal extent of optically generated elastic waves in thin, free-standing, semiconductor films are presented. Our study, focused on symmetric S_1 modes in the 10+ GHz frequency range, indicates that diffraction-limited pulsed laser sources can produce narrow-band elastic excitations with in-plane group velocities sufficient for multi-micrometer-scale lateral propagation at room temperature in GaAs. The theory predicts that pumping GaAs with sub-ps, near-diffraction-limited, optical pulses excites cylindrically spreading S_1 vibration because of the Dirac conelike dispersion of the S_1 mode at small wave numbers. Theoretical predictions of Lamb wave propagation for optically excited 190-nm-thick GaAs suspended plates are found to agree with experimental data acquired using a near-infrared, ultrafast, pump-probe technique.
机译:提出了薄,独立式半导体膜的光学产生弹性波的时空程度的理论和实验研究结果。我们的研究,专注于10+ GHz频率范围内的对称S_1模式,表示衍射限制脉冲激光源可以产生具有足以在室温下进行多微米表级横向传播的平面群速度的窄带弹性激励。 GaAs。该理论预测,利用子PS,近衍射限制,光脉冲泵浦GaAS激发圆柱形扩散S_1振动,因为S_1模式在小波数下的狄拉克座分散。发现光学激发的190nm-厚的GaAs悬浮板的羊羔波传播的理论预测与使用近红外线,超快,泵探针技术获得的实验数据一致。

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  • 来源
    《Physical review》 |2020年第24期|245304.1-245304.13|共13页
  • 作者单位

    U.S. Naval Research Laboratory Code 7130 Washington DC 20375 USA;

    U.S. Naval Research Laboratory Code 7130 Washington DC 20375 USA;

    U.S. Naval Research Laboratory Code 6177 Washington DC 20375 USA;

    U.S. Naval Research Laboratory Code 6177 Washington DC 20375 USA;

    U.S. Naval Research Laboratory Code 6177 Washington DC 20375 USA;

    U.S. Naval Research Laboratory Code 7130 Washington DC 20375 USA;

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  • 正文语种 eng
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