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.
Lu
W T
WT
Physics Department and Electronic Materials Research Institute, Northeastern University, Boston, MA 02115, USA.
Sokoloff
J B
JB
Sridhar
S
S