Ballistic phonon imaging of diamond
Ballistic phonon imaging of diamond
复制标题
金刚石的弹道声子成像
DOI：
10.1088/0022-3719/17/18/007
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发表时间：
1984
期刊：
影响因子：
--
通讯作者：
J. Wolfe
中科院分区：
文献类型：
--
作者：
D. Hurley;A. Every;J. Wolfe
声子成像被用来研究弹道声子在金刚石中的输运。已经获得的图像显示了许多尖锐的特征。其中一些对应于体声子聚焦中的数学奇点或接近奇点。其他结构与钻石表面横波到纵波模式转换的临界锥附近的横向声子沟道相对应。这种沟道是由钻石表面的纵向伪表面波所介导的，并且由于钻石的近乎各向同性及其非常小的有效泊松比而变得非常尖锐。这些沟道结构的存在表明，金刚石表面在主要声子波长(约=200aa)的范围内相对平坦，金属加热器和探测器薄膜与金刚石衬底之间的机械结合较弱。
Phonon imaging has been used to study the transport of ballistic phonons in diamond. The images that have been obtained display a number of sharp features. Some of these correspond to mathematical singularities or near singularities in bulk phonon focusing. Other structures are found to correspond to the channelling of transverse phonons close to the critical cone for mode conversion of transverse to longitudinal waves at the diamond surface. This channelling is mediated by longitudinal pseudo-surface waves at the diamond surface, and is extremely sharp because of the near isotropy of diamond and its exceptionally small effective Poisson's ratio. The presence of these channelling structures signifies that the diamond surface is relatively flat on the scale of the dominant phonon wavelength ( approximately=200 AA) and that the bonding between the metal heater and detector films and the diamond substrate is mechanically weak.