COHERENT PHONON DETECTION FROM ULTRAFAST SURFACE VIBRATIONS

COHERENT PHONON DETECTION FROM ULTRAFAST SURFACE VIBRATIONS
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DOI:
10.1103/physrevlett.69.1668
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发表时间:
1992-09-14
影响因子:
8.6
通讯作者:
KAWASHIMA, K
KAWASHIMA, K
中科院分区:
物理与天体物理1区
文献类型:
--
作者:
WRIGHT, OB;KAWASHIMA, K

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使用光学技术,在0.1太赫兹范围内的薄的不透明膜的表面的超快振动已被直接观察到在时域中。我们提出了一种新的类型的声子检测通过监测表面速度,并表现出一个特殊的灵敏度,原子尺度的不均匀性,通过观察一个异常的反射从埋膜的单层顺序的厚度。
Using an optical technique, ultrafast vibrations of the surface of thin opaque films in the 0.1-THz range have been directly observed in the time domain. We propose a new type of phonon detection by monitoring the surface velocity, and demonstrate an exceptional sensitivity to atomic-scale inhomogeneities by observing an anomalous reflection from a buried film of monolayer order in thickness.