13. OPTICAL PROPERTIES OF METALLIC NANOTUBES WITH BROKEN SYMMETRY: DETECTION OF ECCENTRICITY.

ABRAHAM M; LESTER M

PLASMONICS

SPRINGER

Lugar: Berlin; Año: 2012 vol. 7 p. 579 - 587

1557-1955

The optical properties of dielectric core-metallic concentric shell nanoparticles show a highlysensitive dependence on geometrical parameters of thesystem. It is due to the strong interaction betweenplasmon modes excited on the surfaces of the metallicshell. Perturbations in the symmetries of the systemmodify these interactions and enable new ones, givingrise to dramatic variations in the far field spectrum. Inthis paper, we examine the electromagnetic response(far and near fields) of hollow metallic nanotubes (nts)with empty or dielectric core as a function of theoffset parameter between the core and the shell. Theevolution of extinction spectra shows a strong redshiftfor the dipolar resonance when the offset parameter isincreasing, whereas new multipole interactions can beobserved at high energy. As dimers, the extinction crosssection for nts with nonhomogeneous shell thickness