A possible way to experimentally examine validity of the expressions of dissipated energy density

Abstract

There exist different and even unequivalent expressions of stored and dissipated energy densities, which relate to different conditions of division between stored and dissipated energies (CDSDEs), respectively. Here, we shall demonstrate that, for an electromagnetic wave normally traveling through a slab, energy absorbed by the slab (EAS) can be calculated by applying field quantities of forward and backward waves arising in the slab and selecting one of CDSDEs. On the other hand, the EAS can also be uniquely determined from scattering coefficients, which may be measured experimentally. Thus we shall suggest that applicability of CDSDEs may be tested by comparing EAS obtained from the two ways, subsequently, validity of the corresponding expression of dissipated energy density is examined. Furthermore, we shall confirm feasibility of the suggestion numerically and experimentally. This work may be helpful to properly describe energy storage and dissipation of electromagnetic wave in lossy media and address the related topics.