Confined acoustic vibrations in piezoelectric GaN nanorods
Confined acoustic vibrations in piezoelectric GaN nanorods
复制标题
压电 GaN 纳米棒中的受限声振动
DOI：
10.1063/1.4772516
复制
发表时间：
2012
期刊：
影响因子：
--
通讯作者：
Chi‐Kuang Sun
中科院分区：
文献类型：
--
作者：
P. Mante;H. Chen;Yueh;C. Ho;L. Tu;J. Sheu;Chi‐Kuang Sun
利用超快泵浦-探测光谱技术观察到GaN纳米棒的受限声振动。取决于制造方法，纳米棒的几何性质是不同的，并且可以有利于检测给定的振动模式。在自下而上的制造，检测到的拉伸模式。简要介绍了这些受限声模的探测机理。呼吸模式在自上而下的制造中更容易检测到。从呼吸模式的观察，直径依赖的弹性性能提取。研究了环境对约束振动的影响。
Confined acoustic vibrations of GaN nanorods have been observed using ultrafast pump-probe spectroscopy. Depending on the fabrication method, the geometrical properties of the nanorods are different and the detection of a given vibration mode can be favored. In bottom-up fabrication, the extensional modes are detected. The detection mechanism of these confined acoustic modes is briefly presented. Breathing modes are more easily detected in top-down fabrication. From the observation of the breathing modes, the diameter dependent elastic properties are extracted. The influence of the surrounding on the confined vibration is also studied.