Ultrafast Vibrations of Gold Nanorings
Ultrafast Vibrations of Gold Nanorings
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DOI：
10.1021/nl202045z
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发表时间：
2011-09-01
期刊：
影响因子：
10.8
通讯作者：
Wright, O. B.
中科院分区：
文献类型：
--
作者：
Kelf, T. A.;Tanaka, Y.;Wright, O. B.
我们利用超快光学技术研究了二氧化硅基底上金纳米环的振动模式。通过与数值模拟进行比较，我们确定了与纳米环和基底的轴对称变形相关的千兆赫范围内的几种共振。我们阐明了相应的模态形状，并发现基底在确定模态阻尼方面起着重要作用。这项研究表明需要采用等离子体纳米光学方法来了解等离子体纳米结构振动的光学激发和检测机制。
We investigate the vibrational modes of gold nanorings on a silica substrate with an ultrafast optical technique. By comparison with numerical simulations, we identify several resonances in the gigahertz range associated with axially symmetric deformations of the nanoring and substrate. We elucidate the corresponding mode shapes and find that the substrate plays an important role in determining the mode damping. This study demonstrates the need for a plasmonic nano-optics approach to understand the optical excitation and detection mechanisms for the vibrations of plasmonic nanostructures.