Phonon Spectroscopy with Chirped Shear and Compressive Acoustic Pulses.
Phonon Spectroscopy with Chirped Shear and Compressive Acoustic Pulses.
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DOI：
10.1103/physrevlett.119.255502
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发表时间：
2017-12
影响因子：
8.6
通讯作者：
C. Poyser;W. York;D. Srikanthreddy;B. Glavin;T. Linnik;R. P. Campion-R. P.-Campion-2254186241;A. V. Akimov;A. J. Kent-A. J.-Kent-2253928911
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文献类型：
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作者：
C. Poyser;W. York;D. Srikanthreddy;B. Glavin;T. Linnik;R. P. Campion-R. P.-Campion-2254186241;A. V. Akimov;A. J. Kent-A. J.-Kent-2253928911
注入（311）GaAs板的皮秒持续压缩和剪切声子波包在传播约1 mm后转变为啁啾声脉冲，由于声子色散，频率随时间增加。通过探测GaAs板近表层相干声子的时间光学响应，我们发现声子啁啾为高灵敏度太赫兹和亚太赫兹声子光谱开辟了一条转换途径。啁啾声子脉冲的时间门控允许选择一个窄带声子频谱，其中心频率高达纵向0.4太赫兹，横向0.2太赫兹。
Picosecond duration compressive and shear phonon wave packets injected into (311) GaAs slabs transform after propagation through ∼1 mm into chirped acoustic pulses with a frequency increasing in time due to phonon dispersion. By probing the temporal optical response to coherent phonons in a near surface layer of the GaAs slab, we show that phonon chirping opens a transformational route for high-sensitivity terahertz and subterahertz phonon spectroscopy. Temporal gating of the chirped phonon pulse allows the selection of a narrow band phonon spectrum with a central frequency up to 0.4 THz for longitudinal and 0.2 THz for transverse phonons.