Two-dimensional spoof surface plasmon polaritons for designing holographic metasurfaces

We propose a method to design two-dimensional (2D) holographic metasurfaces, which are composed of textured structures, to support spoof surface plasmon polaritons (SPPs) in the microwave frequency. We implement the metasurface by an array of sub-wavelength metallic blocks drilled with dielectric holes. By mapping the corresponding surface impedance to the size of dielectric hole, we can shape the quasi-periodic distribution of spoof SPP structure. Combining with the holographic antenna technology and radiation theory of leaky-wave, we design a planar spiral antenna, which can generate the radiations of two reversely circular polarizations in the two sides of planar antenna. The design can be extended to millimeter-wave or THz regimes by scaling down the structure.