Phys. Rev. Lett.

Volume 90, Page 029303


Comment on “Wave Refraction in Negative-Index Media: Always Positive and Very Inhomogeneous”


JB Pendry and D.R. Smith


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?’. ….


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