Imaging properties and negative refraction of the metallic photonic crystal at near-infrared frequency

Imaging properties and negative refraction of the two-dimensional metallic photonic crystal (PC) consisting of a triangular lattice of silver rods immersed in a dielectric is studied. It is found that good-quality image spots and negative refraction with an effective refractive index of −1 can be achieved for the near-infrared frequency through the adjustment of the metallic PCʹs lattice constant and the permittivity of the background material together. Drude dispersion model is adopted to describe the silver rod and it is found that the influence of the metalʹs absorption is trivial to debase the quality of the image spot.