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首页> 外文期刊>Physical review letters >Thermal Boundary Resistance between GaN and Cubic Ice and THz Acoustic Attenuation Spectrum of Cubic Ice from Complex Acoustic Impedance Measurements
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Thermal Boundary Resistance between GaN and Cubic Ice and THz Acoustic Attenuation Spectrum of Cubic Ice from Complex Acoustic Impedance Measurements

机译:GaN与立方冰之间的热边界电阻和立方冰的THz声衰减谱。

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摘要

A phonon nanoscopy method, based on the picosecond ultrasonics technique, capable of studying the complex acoustic reflection coefficient at frequency up to 1 THz is proposed and demonstrated. By measuring the reflection coefficient at the same surface location at the interface between GaN and air, and between GaN and the material to characterize, we get access to the THz amplitude and phase spectra of the acoustic phonon reflection. The retrieval of both these pieces of information then allows the calculation of the attenuation in a wide range of frequency and gives new insight into the Kapitza anomaly. This method is then applied to cubic ice, and the measurements of the elastic properties, the phonon anharmonic decay spectrum up to 1 THz, as well as the measurements of the thermal phonon lifetime at 150 K are all achieved.
机译:提出并证明了一种基于皮秒超声技术的声子纳米技术,能够研究频率高达1 THz的复声反射系数。通过测量GaN与空气之间以及GaN与要表征的材料之间的同一表面位置处的反射系数,我们可以获取声子反射的THz振幅和相位谱。然后,这两条信息的检索就可以在很宽的频率范围内计算衰减,并提供有关Kapitza异常的新见解。然后将该方法应用于立方冰,并且可以实现对弹性特性的测量,高达1 THz的声子非调和衰减谱以及在150 K下的热声子寿命的测量。

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  • 来源
    《Physical review letters》 |2013年第22期|225901.1-225901.5|共5页
  • 作者单位

    Department of Electrical Engineering and Graduate Institute of Photonics and Optoelectronics, National Taiwan University, Taipei 10617, Taiwan;

    Department of Electrical Engineering and Graduate Institute of Photonics and Optoelectronics, National Taiwan University, Taipei 10617, Taiwan;

    Department of Electrical Engineering and Graduate Institute of Photonics and Optoelectronics, National Taiwan University, Taipei 10617, Taiwan;

    Institute of Electro-Optical Science and Engineering and Advanced Optoelectronic Technology Center, National Cheng Kung University, Tainan 70101, Taiwan;

    Department of Electrical Engineering and Graduate Institute of Photonics and Optoelectronics, National Taiwan University, Taipei 10617, Taiwan Molecular Imaging Center, National Taiwan University, Taipei 10617, Taiwan Institute of Physics, Academia Sinica, Taipei 115, Taiwan;

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

    thermal properties of crystalline solids; ultrasonic relaxation;

    机译:结晶固体的热性能;超声波松弛;

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