Manipulating Surface Plasmon Polaritons on the meta-surface

We proposed a concept of meta-surface composed of sub-wavelength groove arrays in gold film on chromium(Cr) layer with designable parameters, which allows for flexible manipulations of the Surface Plasmon Polaritons (SPPs). The SPP propagation and dispersion properties were systematically studied in the theoretical meta-surface scheme by numerical simulations. For details, a conventional SPP wave on metal surface was launched by a proper grating and then incident onto the meta-surface. Adopting periodic structural parameters, we find the surface waves can be split into two beams within the structure, which depends on the specific designs. This phenomenon is valid in visible wavelength of 633nm. Our meta-surface design would open a new avenue in manipulating the surface wave and hold the promise to develop new kinds of nanophotonic elements and interconnects.