Interface modes of two-dimensional composite structures

TL;DR

This paper investigates the surface modes of 2D composite structures with metallic wires, analyzing their optical properties, shape effects, and wire interactions through photonic band structure calculations.

Contribution

It provides a detailed analysis of surface modes in 2D metallic wire composites, including effects of wire shape, polarization, and interactions on plasmon localization.

Findings

Effective dielectric response varies with filling fraction.

Wire shape and polarization influence optical absorption.

Wire interactions affect surface plasmon localization.

Abstract

The surface modes of a composite consisting of aligned metallic wires with square cross sections are investigated, on the basis of photonic band structure calculations. The effective long-wavelength dielectric response function is computed, as a function of the filling fraction. The dependence of the optical absorption on the shape of the wires and the polarization of light is discussed, and the effect of sharp corners analyzed. The effect of the interaction between the wires on the localization of surface plasmons is also addressed.