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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