Applied Physics B

, Volume 73, Issue 4, pp 299-304

First online:

Influence of the cross section and the permittivity on the plasmon-resonance spectrum of silver nanowires

  • J.P. KottmannAffiliated withElectromagnetic Fields and Microwave Electronics Laboratory, Swiss Federal Institute of Technology, ETZ G96, ETH-Zentrum, 8092 Zurich, Switzerland
  • , O.J.F. MartinAffiliated withElectromagnetic Fields and Microwave Electronics Laboratory, Swiss Federal Institute of Technology, ETZ G96, ETH-Zentrum, 8092 Zurich, Switzerland

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Abstract.

We investigate the plasmon resonances for silver nanowires with a non-regular cross section. To study the relationship between the cross section and the spectrum of the plasmon resonances, we consider cross sections evolving from a rectangular shape to a triangular one. In particular, we study the influence of the sharpness of a corner on the near-field enhancement at the vicinity of a particle and discuss its implications for surface-enhanced Raman scattering. We also investigate the influence of the absorption on the plasmon-resonance spectrum and on the near-field enhancement.

PACS: 73.20.Mf; 78.67.-n; 87.64.Je