On the inapplicability of a negative-phase-velocity condition as a negative-refraction condition for active materials
arXiv:0812.0171 · doi:10.1002/mop.24289
Abstract
A negative-phase-velocity condition derived by Depine and Lakhtakia [Microwave Opt Technol Lett 41 (2004) 315] for isotropic, homogeneous, passive, dielectric-magnetic materials is inapplicable as a negative-refraction condition for active materials.
replacement for preliminary version submitted earlier by error