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.Comment: 9 pages, 6 figure
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