Comment on "Wave Refraction in Negative-Index Media: Always Positive and Very Inhomogeneous"
arXiv:cond-mat/0206563 · doi:10.1103/PhysRevLett.90.029703
Abstract
In a recent Physical Review Letter [1] Valanju Walser and Valanju (VWV) called into question the basis of work on the so called negative index media (NIM). See for example [2,3]. The key point at issue is, `what is the group velocity of a wave in NIM?'
Comment on Phys. Rev. Lett., v. 88, 187401 (2002)