A comparative FDTD study of various PML configurations for the termination of nonlinear photonic bandgap waveguide structures

A comparative investigation of high-performance nonlinear, homogeneous and periodic, perfectly matched layers (PMLs) for the termination of twodimensional (2-D) nonlinear photonic bandgap waveguides is conducted. The absorbing configurations are combined with an appropriate Z-transformbased finite difference time domain (FDTD) technique for the numerical treatment of the nonlinear materials. As in the linear case, a remarkable reduction of the reflected waves is achieved when the periodic dielectric motif of the waveguide is continued inside the absorbing layers.