期刊
ULTRASONICS
卷 56, 期 -, 页码 98-108出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.ultras.2014.02.013
关键词
Ultrafast spectroscopy; Metal nanoparticles; Acoustic vibrations; Pump-probe; THz domain
The acoustic vibrations of single-metal and multi-material nanoparticles are studied by ultrafast pump-probe optical spectroscopy and described in the context of the continuous elastic model. The applicability of this model to the small size range, down to one nanometer, is discussed in the light of recent experimental data and ab initio calculations. Investigations of multi-material nano-objects stress the impact of the intra-particle interface on the characteristics of their vibrational modes, also yielding information on the composition and spatial distribution of the constituting materials. (C) 2014 Elsevier B.V. All rights reserved.
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