Split-step finite difference time domain algorithm for double negative meta-materials

Unconditionally stable finite difference time domain (FDTD) formulation is presented for modelling electromagnetic wave propagation in open region double-negative meta-material domains. The formulation is based on incorporating the bilinear transformation technique and the stretched coordinate perfectly matched layer into the split-step FDTD algorithm. Numerical examples carried out in one- and two-dimensional domains show that the proposed formulation not only maintains the accuracy level of the conventional alternating direction implicit FDTD scheme but also reduces the required computational time by 21%.