20 research outputs found
Negative Refraction in Perspective
The concept of negative refraction is attracting a lot of attention. The
initial ideas and the misconceptions that have arisen are discussed in
sufficient detail to understand the conceptual structure that binds negative
refraction to the existence of backward wave and forward wave phenomena. A
presentation of the properties of isotropic media supporting backward waves is
followed by a discussion of negative phase velocity media, causality,
anisotropic crystals and some connections to photonic crystals. The historical
background is always coupled to a detailed presentation of all the issues. The
paper is driven numerically and is illustrated with the outcomes of original
FDTD simulations