Plasmonics metamaterials of high refractive index at visible frequency

We proposed that the interaction between the surface plasmon modes would create the high index of refractive in the subwavelength metallic channel at optical frequency. The analytically discussion of the dependence of the refractive index value on the unit cell geometry and the metal dielectric function were performed. It is interesting that the proposed high refractive index metamaterials can be realized without any electric or magnetic resonance along the geometry and thus has the promising potential in reducing the material loss. In addition, a kind of spatially non-uniform high refractive index plasmonics metamaterials was introduced to manipulating light in subwavelength scale, and a focusing nano-optics element design process was illustrate to verified the potential application of non-uniform plasmonics metamaterials at optical frequency.