FDTD and PSTD simulations for double negative (DNG) materials applications

As a full wave simulation method, the finite-difference time-domain (FDTD) method is capable of capturing the transient characteristics of wave propagation. This method has been successfully used in modeling the interactions of electromagnetic waves with double negative (DNG) materials. Another method, the pesudospectral time-domain (PSTD) method, is superior to FDTD in its linear dispersion relation. Another advantage of PSTD is that all field components are now located at a same position in the unit cell. Therefore, it is more natural to handle the boundary condition on interfaces between different materials. In this paper, FDTD and PSTD are used to simulate the transient evolution of wave propagation in structures with DNG materials. Numerical results are given to provide clear descriptions of the novel wave behaviors.