A STRETCHED COORDINATE TECHNIQUE FOR NUMERICAL ABSORPTION OF EVANESCENT AND PROPAGATING WAVES IN PLANAR WAVE-GUIDING STRUCTURES

Berenger's PML technique is modified to allow for the absorption of ev anescent and propagating waves in FDTD modeling of wave propagation in planar waveguiding structures. Analytic results illustrate the validi ty and capability of the proposed modification. Numerical studies expl ain the numerical implementation of the modified PML in the FDTD and i n the compact 2D-FDTD algorithms. Guidelines for the proper selection of the various parameters that govern the performance of the modified PML are presented. The results from simulations indicate that the prop osed modified PML grid truncation can be used efficiently for highly a ccurate numerical analysis of planar waveguiding structures.