Figure 1
(a) The truncated view of a 2-D periodic array of PNSs. (b) The unit cell of the two proposed cases, i.e., (c) case 1: an all-metal PNS with a combination of a metal nanosphere and a metal nanorod and (d) case 2: a combination of a metal nanosphere and a core-shell nanorod (metal-shell with a dielectric nanorod in core region), respectively. The axis shows the propagation direction and polarization of the incident EM wave where the period, height of the nanorod, radius of the nanorod, radius of the nanophere, thickness of the Ag nanoshell and radius of the dielectric nanorod in Ag nanoshell are denoted by Λ, h, r, R, t and d, respectively. The environmental refractive index is set to be n = 1.0 for air.
