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. 2015 Mar 18;5:9250. doi: 10.1038/srep09250

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(a) Dispersion relations of complementary R-shaped grooves for odd mode and even mode. (b) The E_y field distributions for the two modes along the observation line shown in the inset. (c) The spatial variation of the z-component electric field (E_z) for the dominant odd mode of the complementary plasmonic structure at 6.8 GHz. (d) The E_z field distribution for the dominant even mode of the normal corrugated metal strip at 7 GHz. (e) The E_z field distribution for the dominant even mode of the DMD interface in the optical regime at 300 THz. (f–h) The E_z field distributions for the high-order modes of the complementary structure (8 GHz), normal structure (7.8 GHz), and DMD interface (560 THz). The operating frequencies are all close to their asymptotic frequencies, and the yellow parts in Figure (c), (d), (f), and (g) indicate metal.