Raman scattering from surface optical phonon in diameter modulated AlN nanotips
Raman scattering from surface optical phonon in diameter modulated AlN nanotips
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DOI：
10.1063/1.3337112
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发表时间：
2010-03
影响因子：
4
通讯作者：
S. Sahoo;S. Dhara;A. Arora;R. Krishnan;P. Chandramohan;M. P. Srinivasan
中科院分区：
文献类型：
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作者：
S. Sahoo;S. Dhara;A. Arora;R. Krishnan;P. Chandramohan;M. P. Srinivasan
我们使用拉曼光谱研究了 AlN 纳米尖端中的光学声子。除了理论上允许的光学声子组之外，还观察到了 850 cm−1 处的附加声子模式。此外，峰位置显示出显着的红移，并且其强度随着介电介质的变化而急剧增加。鉴于其对介电介质变化的强烈响应以及与计算出的 AlN 表面光学声子频率良好的一致性，观察到的声子模式被指定为表面光学声子，这可能归因于 AlN 纳米尖端的直径调制。
We investigate the optical phonons in AlN nanotips using Raman spectroscopy. Apart from the group theoretically allowed optical phonons, an additional phonon mode at 850 cm−1 has been observed. Furthermore, the peak position has shown a significant redshift and its intensity increases dramatically with the change in dielectric medium. In view of its strong response to change in dielectric medium and good agreement with calculated surface optical phonon frequency in AlN, the observed phonon mode is assigned as surface optical phonon, which could be attributed to the diameter modulation in case of AlN nanotip.