Figure 1.

Plot of the Bloch wave vector K as a function of the normalized photon energy for a metallic PBG. The vertical dashed lines show εv/εp and εc/εp which are the maximum normalized energy of the lower energy band and the minimum normalized energy of the upper energy band, respectively. The refractive index of background is n2 = 1.5

Hatef and Singh Nanoscale Research Letters 2010 5:464-468   doi:10.1007/s11671-009-9517-1