(color online) Surface current distributions on the top double rods ((a), (d), (g)) and on the ground plane ((b), (e), (h)), and electrical field profiles ((c), (f), (i)) of the three resonant modes of the metasurface. Top row, middle row, and bottom row are for the resonance at 26 THz, 37 THz, and 43.3 THz, respectively.