Physics – Condensed Matter – Materials Science
Scientific paper
2007-03-26
Physics
Condensed Matter
Materials Science
9 pages, 9 figures, to appear in Phys. Rev. B
Scientific paper
Plasmon modes of a two-dimensional lattice of long conducting circular wires are investigated by using an embedding technique to solve Maxwell's equations rigorously. The frequency-dependent density of states is calculated for various values of the wave vector and the filling fraction. At low filling fractions, collective modes are all found to accumulate at the surface-plasmon frequency $\omega_p/\sqrt{2}$, $\omega_p$ being the bulk plasmon frequency. As the filling fraction increases, the interference between the electromagnetic fields generated by localized surface-plasmon polaritons leads to the presence of {\it new} resonances, whose frequency strongly depends on the interparticle separation. For touching wires, a number of multipole resonances fill the spectral range between dipole resonances, as occurs in the case of a three-dimensional packing of metal spheres.
Giannakis N.
Inglesfield J. E.
Pitarke J. M.
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