Hyperbolic Metasurface at Microwave Frequency for Spoof Surface Plasmon Polaritons

Hyperbolic metasurfaces have recently emerged as a new class of anisotropic two-dimensional materials to manipulate surface plasmon polaritons (SPPs) and show many potential applications. The hyperbolic metasurfaces in practice may be implemented with plasmonic materials at infrared and optics frequencies. In this work, we proposed and characterized an ultrathin metasurface with a hyperbolic dispersion, which originates from one of the principal components of their electric effective tensor having the opposite sign to the other two principal components. Hyperbolic propagation properties of spoof surface plasmon polaritons have been demonstrated on this metasurface. Comparing with traditional three-dimensional metamaterials, the metasurface can exhibit low propagation loss and compatibility with the integrated circuit, which may find plenty of applications in spatial multiplexers, focusing and imaging devices, planar hyper lens, in microwave and terahertz frequencies.