I analyze propagation of ultralocalized surface waves that takes place at the boundary between a semi-infinite layered metal-dielectric nanostructure cut normally to the layers and a isotropic medium. It is demonstrated that Dyakonov-like surface waves (also coined dyakonons) with hybrid polarization may propagate in a wide angular range. As a consequence, dyakonon-based wave-packets (DWPs) may feature subwavelength beamwidths. Out of the hyperbolic-dispersion regime in plasmonic crystals, DWPs are still sustained in the canalization regime. Dominant diffusion dynamics,however, is driven by dissipation effects in metal.... [Leer más...]