Figure 10.

(a) Schematic illustration of a free-standing fishnet MM slab, and its optical configuration. (b) Absorption spectra at TM polarization, shown with an offset. Incident angles vary from 0° to 20° (from bottom to top). (c) Dispersion diagrams, obtained from the absorption peaks. Left: TE modes. Right: TM modes. Oblique solid lines denote the light cone in air. The dashed line represents the lowest mode in a homogeneous MIM (h-MIM) waveguide. The dotted line denotes the reduced MIM (r-MIM) mode into the first Brillouin zone. (d) Time-averaged EM power flow in the I layer (left) and the xz sections (right). The excitation condition is indicated by arrows in (b) and (c). The definition of the power flow is given in the text. (e) Time-averaged EM power flow in a five-layers fishnet MM slab, containing three metal and two insulator layers. The excitation condition is similar to that in (d).