Plasmon polaritons of metallic nanowires for controlling submicron propagation of light

We use the Green dyadic technique to study the propagation of a local excitation along metallic nanowires of a subwavelength cross section. The metallic nanowires are elongated parallelepipeds deposited on a transparent substrate. A tightly focused plane wave illuminates one end of the nanowires. The localized surface-plasmon resonances of the nanowires propagate the local excitations over distances larger than the incident wavelength. The properties of the electromagnetic eigenmodes of the nanowires are analyzed in terms of the local density of states.