Electromagnetic Wave Propagation in Media with Indefinite Permittivity and Permeability Tensors

TL;DR

This paper investigates wave propagation in media with indefinite permittivity and permeability tensors, revealing effects like negative refraction and near-field focusing, and demonstrating field transfer in bi-layer structures without exponential growth.

Contribution

It introduces analysis of wave behavior in indefinite media, highlighting novel effects and the potential for field transfer without exponential wave growth.

Findings

Negative refraction observed in indefinite media

Near-field focusing achieved with these materials

Bi-layer structures can transfer fields without exponential growth

Abstract

We study the behavior of wave propagation in materials for which not all of the principle elements of the permeability and permittivity tensors have the same sign. We find that a wide variety of effects can be realized in such media, including negative refraction, near-field focusing and high impedance surface reflection. In particular a bi-layer of these materials can transfer a field distribution from one side to the other, including near-fields, without requiring internal exponentially growing waves.