Vibrational modes of GaAs hexagonal nanopillar arrays studied with ultrashort optical pulses
Vibrational modes of GaAs hexagonal nanopillar arrays studied with ultrashort optical pulses
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DOI：
10.1063/1.3696380
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发表时间：
2012-03
影响因子：
4
通讯作者：
Hirotaka Sakuma;M. Tomoda;P. Otsuka;O. Matsuda;O. Wright;T. Fukui;K. Tomioka;I. Veres
中科院分区：
文献类型：
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作者：
Hirotaka Sakuma;M. Tomoda;P. Otsuka;O. Matsuda;O. Wright;T. Fukui;K. Tomioka;I. Veres
我们调查的振动模式的三角形阵列的各向异性，六角GaAs纳米柱的GaAs衬底上通过超快变化的光学反射率。通过与模拟比较，我们确定GHz的谐振，模式形状，和阻尼。此外，通过改变柱的直径，高度和间距，我们区分集体和本地化模式。一个适当的理解基板附着的纳米结构动力学将导致更好的表征纳米传感器的基础上的扰动振动共振。
We investigate the vibrational modes of a triangular array of anisotropic, hexagonal GaAs nanopillars on a GaAs substrate through ultrafast changes in optical reflectivity. By comparison with simulations, we identify GHz resonances, mode shapes, and damping. In addition, by varying the pillar diameter, height, and pitch, we distinguish collective and localized modes. A proper understanding of substrate-attached nanostructure dynamics will lead to better characterization of nanosensors based on perturbations to vibrational resonances.