Wave Propagation Parallel to Plane Interface of two Dielectric Half Spaces (original) (raw)

Wave propagation parallel to a dielectric interface has been studied by considering an electric current line source at the interface. The first order asymptotic evaluation of field components show a null of the electric field at the interface. An amplitude null represents an unstable structure and phase front dis-continuity across the interface. Higher order asymptotic evaluations have been employed to get further insight into this propagation problem. The results show that the wave-fronts need not be discontinuous. The continuity of the phase fronts is preserved with the help of interesting and stable structures such as saddle points and center points in the phase map.