METALLIC NANOTUBES CHARACTERIZATION VIA SURFACE PLASMON EXCITATION

ABRAHAM EKEROTH, R. M.; LESTER, M.; SCAFFARDI, L. B.; SCHINCA, D. C.

PLASMONICS

SPRINGER

Lugar: Berlín; Año: 2011 vol. 6 p. 435 - 444

1557-1955

AbstractIn this work we show theoretical results of the behaviour of the extinction cross section as a function of the incident wavelength for metallic nanotubes (Nts) with a 2D core-shell structure. To calculate the optical response of the gold, silver and cooper system, an exact integral formalism is implemented. The method is based on Green’s Integral Theorem and it allows us to compute the electromagnetic field at any point in space. For a correct description of the constitutive parameters of the metallic shell we introduce a corrective model for the dielectric function in terms of the shell thickness in the range 1nm to 10nm.In particular, we investigate the features of surface plasmons in metallic nanotubes (Nts) and in the cases of Au and Cu, the mechanisms of the interband transitions play a relevant role. In this paper we show that a quasi-static approach is not sufficient to account the plasmon-plasmon interaction in Ag Nts. The aim of these studies is to characterize coresize and shell thicknesses of the Nts by means of the surface plasmon resonance observed in the far field.