An accurate control of the surface wave using transformation optics.

In this paper, we study two surface wave control scenarios at microwave frequencies. The first is a surface wave traveling along an uneven interface with a triangular obstruction present on a grounded dielectric slab. The other is a surface wave that circumvents a metallic rhombus-shaped obstacle, which is partially buried in a flat grounded dielectric slab. With a consideration of the eigenmode properties of the surface wave, our proposed technique - based on transformation optics - offers an efficient and accurate way to perform the filed manipulation. On the one hand, we see that the surface wave is guided along the uneven interface with no scattering into the air, as the grounded dielectric slab is flat. On the other hand, we observe that the surface wave is capable of traversing the rhombus obstacle with no shadow left behind, as the obstacle is cloaked. This technique for surface wave control is also valid at higher frequency ranges, and can easily be extended to encompass other propagating modes.