Enhanced group velocity in metamaterials
arXiv:physics/0402037 · doi:10.1088/0305-4470/37/1/L04
Abstract
The Bruggeman formalism is implemented to estimate the refractive index of an isotropic, dielectric, homogenized composite medium (HCM). Invoking the well--known Hashin--Shtrikman bounds, we demonstrate that the group velocity in certain HCMs can exceed the group velocities in their component materials. Such HCMs should therefore be considered as metamaterials.