EM ANALYSIS OF A CONDUCTING SCATTERER IN OPTIC DIELECTRIC WAVE-GUIDE

A method to compute the scattered field of curved mirrors and gratings in a dielectric slab waveguide is proposed, In contrast to the beam p ropagation method (BPM) for this kind of problems, the method of momen t is adopted. By introducing the dyadic Green's function in a slab wav eguide, the electric field integral equations for induced current dist ribution on the conducting obstacles are derived. To improve the compu tational efficiency, the modified Green's function is incorporated int o the computation program. With this study, the effects of grooves of gratings and the finite extent of the mirrors in dielectric waveguides can be investigated in more detail.