Abstract
A three-dimensional silver metallic nanowires array which can realize negative refraction and image focusing in the visible frequency is presented. Homogeneous effective medium theory is used to investigate the negative refraction properties when the cell size of the array is much smaller than the incident wavelength. The analytical results are confirmed by Finite Difference Time Domain (FDTD) numerical simulations. The imaging properties comparison among the nanowires arrays with triangle, circle, ellipse, hexagon, and square wire cross-sections which have the same filling factor show the structure shapes of the nanowires will not influence the negative refraction but the imaging properties because of the different loss from the metal nanowires.
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