Tunable negative-index photonic crystals using colloidal magnetic fluids |
Band structures of the PC slab with h = a at H = 250 Oe for odd modes using the FDTD (empty circles) and PWE methods (solid line). Gray lines specify the light line. Dashed line shows the band structure of the ideal 2D PC at H = 250 Oe for TM modes using the PWE method for comparison. |