Analysis on absorbing peak frequency of electromagnetic wave absorption in two low-loss periodically layered dielectric materials

A large absorption of the electromagnetic wave achieves using periodically layered materials with low loss. Our FDTD calculation demonstrates the sharp absorption at discrete frequencies for TM and TE polarizations. These frequencies are called absorbing peak frequencies, which are determined by the characteristic equations related to the transversal resonance in the cross section of the composite material. An equivalent dielectric constant of the composite material is required to solve these equations. One method to estimate the equivalent dielectric constant is based on electrically stored energy in the material, and the other is based on the effective dielectric constant method The absorbing peak frequencies obtained by two methods are compared with FDTD calculation