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Poynting theorem constraints on the signs of the imaginary parts of the electromagnetic constitutive parameters: comment

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Abstract

Contrary to an unphysical conclusion obtained by Alavikia et al. [J. Opt. Soc. Am. A 32, 522 (2015) [CrossRef]  ], the imaginary parts of both the permittivity and the permeability of any linear, homogeneous, passive, spatially local, dielectric-magnetic material are always positive, independent of the signs of their real parts.

© 2015 Optical Society of America

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