Nonlocal Homogenization Model for a Periodic Array of Epsilon-Negative Rods

TL;DR

This paper introduces a nonlocal homogenization model for periodic epsilon-negative rod arrays, revealing dispersionless modes that enable sub-wavelength imaging, validated through numerical simulations.

Contribution

It presents a novel effective permittivity model accounting for spatial dispersion in epsilon-negative rod arrays, enabling accurate prediction of electromagnetic behavior.

Findings

The medium supports dispersionless modes guiding energy along rods.

Spatial dispersion effects are significant and cannot be neglected.

Numerical simulations confirm the model's accuracy.

Abstract

We propose an effective permittivity model to homogenize an array of long thin epsilon-negative rods arranged in a periodic lattice. It is proved that the effect of spatial dispersion in this electromagnetic crystal cannot be neglected, and that the medium supports dispersionless modes that guide the energy along the rod axes. It is suggested that this effect may be used to achieve sub-wavelength imaging at the infrared and optical domains. The reflection problem is studied in detail for the case in which the rods are parallel to the interfaces. Full wave numerical simulations demonstrate the validity and accuracy of the new model.