Refraction of electromagnetic energy for wave packets incident on a negative-index medium is always negative.
We analyze refraction of electromagnetic wave packets on passing from an isotropic positive to an isotropic negative-refractive-index medium. We definitively show that in all cases the energy is always refracted negatively. For localized wave packets, the group refraction is also always negative.
Physics Department and Electronic Materials Research Institute, Northeastern University, Boston, MA 02115, USA.
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Sokoloff
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Sridhar