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

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

2011-06-22

arxiv.org/abs/1106.4533v1

Opt. Express 19, 15371 (2011)

Physics

Optics

9 pages, 6 figures

Scientific paper

10.1364/OE.19.015371

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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