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arXiv 1106.4533physics.opticscond-mat.mes-hall
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单根银纳米棒的表面等离子体激元模式:电子能量损失研究

Surface plasmon modes of a single silver nanorod: an electron energy loss study

Olivia Nicoletti, Martijn Wubs, N. Asger Mortensen, Wilfried Sigle, Peter A. van Aken, Paul A. Midgley

摘要:

我们提出了一个电子能量损失的研究,使用能量过滤TEM的空间分辨表面等离子体激元激发银纳米棒的纵横比14.2休息在30 nm厚的氮化硅膜。我们的研究结果表明,激发量子化的共振模式,其强度的最大值沿纳米棒的长度变化,其波长变得压缩向纳米棒的两端。模拟银纳米棒-氮化硅系统的表面等离子体激元响应的理论计算表明,为了准确地描述共振模式的能量色散,包括延迟和基板效应的重要性。

英文摘要:

We present an electron energy loss study using energy filtered TEM of spatially resolved surface plasmon excitations on a silver nanorod of aspect ratio 14.2 resting on a 30 nm thick silicon nitride membrane. Our results show that the excitation is quantized as resonant modes whose intensity maxima vary along the nanorod's length and whose wavelength becomes compressed towards the ends of the nanorod. Theoretical calculations modelling the surface plasmon response of the silver nanorod-silicon nitride system show the importance of including retardation and substrate effects in order to describe accurately the energy dispersion of the resonant modes.

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