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Schematic of (a) a block of perfect electric conductor, which is infinitely long in direction and cut through by one-dimensional periodic slits (Ref. 1) and (b) the PEC metal surface with one-dimensional periodic rectangle holes drilled in, where is the width of the slits or holes, is the length of the holes, and is the periodicity. (c) and (d) are the effective waveguide structures corresponding to (a) and (b), respectively.
(Color online) (a) Dispersion diagram of the guided modes with , , and the depth of the holes . The gray area is the light cone. The dash line corresponds to the cutoff frequency of the rectangle holes. The snapshot of the field for guided modes with in (b) plane crossing the center of holes and (c) the unit cell volume. (b1) and (c1) correspond to the guided mode for , and (b2) and (c2) for . The black lines in (b) give the outlines of the metal.
(Color online) Distribution of intensity of the DSP mode in Figs. 2(b1) and 2(c1) along (a) the plane and (b) the plane across the maximum, respectively. The red lines give the outline of the metal.
Reciprocal of the group velocity of the DSP modes in Fig. 2(a).
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