Comment on "Wave Refraction in Negative-Index Media: Always Positive and Very Inhomogeneous"
JB Pendry, D.R. Smith
TL;DR
This paper critiques recent claims about wave refraction in negative-index media, focusing on the interpretation of group velocity and its implications for understanding wave behavior in such media.
Contribution
It provides a critical analysis of the assumptions regarding group velocity in negative-index media, challenging recent assertions and clarifying the theoretical basis.
Findings
Questions the validity of previous group velocity interpretations in NIM
Highlights the inhomogeneous nature of wave refraction in NIM
Clarifies the theoretical understanding of wave behavior in negative-index media
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?'
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