Response to 'on negative refraction in classical vacuum'

Tom G. MacKay, Akhlesh Lakhtakia

Research output: Contribution to journalArticlepeer-review

4 Scopus citations


An analysis [McCall, M.W. J. Mod. Opt. 2007, 54, 119-128] based on the electromagnetic energy-momentum tensor, to explore the prospects for negative-phase-velocity (NPV) propagation in gravitationally affected vacuum, did not consider (i) the total energy-momentum tensor and (ii) the global perspective of curved spacetime. Also, the appearance of NPV was wrongly attributed to a change in signature of the spacetime metric.

Original languageEnglish (US)
Pages (from-to)323-328
Number of pages6
JournalJournal of Modern Optics
Issue number2
StatePublished - Jan 2008

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics


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