Wave propagation in hyperbolic metasurfaces

The unique combination of reduced dimensionality and unusual electromagnetic response in metasurfaces [see N. Yu and F. Capasso, Nat. Mater. 13, 139 (2014)] have recently led to the development of exciting applications, such as lenses able to control the direction of incoming beams [see F. Monticone, et al, Phys. Rev. Lett. 110, 203903 (2013)], 2D waveguides supporting surface plasmons (SPPs) [see M. Jablan, et al, Phys. Rev. B., 80, 245435 (2009)], or ultrathin reconfigurable antennas [see J. S. Gómez-Díaz, et al, Opt. Express, 21, 24856 (2013)]. In a related context, bulk hyperbolic media [see V. P. Drachev, et al, Phys. Rev. B., 21, 1699 (2013)] are well-known for combining dielectric and metallic properties in a single structure, thus providing interesting phenomena such as the increase of the local density of states of a dipole located in their vicinity or negative refraction.