Design of broadband visible carpet cloak based on composite media

Abstract

The main purpose of this paper is design of a carpet cloak to operate at visible wavelength range (500 to 700nm) using nanocomposite materials. The refractive index profile of the cloak region is calculated using an analytic function determined by standard conformal mapping. Since the refractive index for cloak region have to be between 0 and 1, and usually implementation of this range is hard, so, the cloak region is compacted as more as possible. Cloak region is divided into some pixels and the refractive index of each pixel is approximated as the refractive index value obtained by the mapping in the center of the pixel. To realize required refractive index, each pixel is considered as a polymeric medium with random distribution of spherical metal and doped semiconductor nanoparticles with desired plasma frequency and filling factor.