Abstract
AbstractElectromagnetic power flow, energy density, and the energy transport velocity that equals the group velocity of a lossless wave packet are straightforwardly derived for the recently formulated electric and magnetic anisotropic representation of spatially dispersive materials or metamaterials. Boundary conditions in spatially dispersive media are used to confirm analytically and numerically the expressions obtained for the power flow and energy density. A long‐standing alternative expression for the energy transport velocity in spatially dispersive media is shown to be invalid. Plausible formulation‐independent definitions of spatial and temporal dispersion for normal modes are proposed in terms of group and phase velocities.
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