title: Surface plasmon modes of a single silver nanorod: an electron energy loss study.
abstract: 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.
authors.affiliation: Department of Materials Science and Metallurgy, University of Cambridge, Pembroke Street, CB2 3QZ Cambridge, UK. on214@cam.ac.uk
authors.forename: Olivia
authors.initials: O
authors.lastname: Nicoletti
authors.forename: Martijn
authors.initials: M
authors.lastname: Wubs
authors.forename: N Asger
authors.initials: NA
authors.lastname: Mortensen
authors.forename: Wilfried
authors.initials: W
authors.lastname: Sigle
authors.forename: Peter A
authors.initials: PA
authors.lastname: van Aken
authors.forename: Paul A
authors.initials: PA
authors.lastname: Midgley
mesh_terms: D003198:Computer Simulation; D004548:Elasticity; D004583:Electrons; D053768:Metal Nanoparticles / Q000737:chemistry*; D046529:Microscopy, Electron, Transmission / Q000379:methods; D036103:Nanotechnology / Q000379:methods*; D017655:Silicon Compounds / Q000737:chemistry; D012834:Silver / Q000737:chemistry*; D013059:Spectrum Analysis, Raman / Q000379:methods; D020349:Surface Plasmon Resonance / Q000379:methods*
chemical_list: D017655:Silicon Compounds; D012834:Silver; C032734:silicon nitride