Abstract
A tunable planar lens metasurface composed of a gold array on a Titanium dioxide slab is presented. Each cell of such a structure comprised of a V-shaped gold nano-antenna on a uniaxial anisotropic substrate. In the design of such a planar lens, the phase diagram of the cross-polarized scattered field is obtained using a spectral domain calculation based on dyadic Green's function. This function, which is obtained by employing the transmission line (TL) model, appears in an integral equation. By solving the integral equation using Galerkin's Method of Moments (MoM) with the appropriate entire domain functions, the effective surface current densities on the gold array is determined. A series of V-shaped elements with the different dimensions are selected, based on the equal optical length principle, to satisfy the phase discontinuities of each cell. Finally, the lens metasurface illuminated by the plane wave is analyzed by using an electromagnetic simulator. The obtained results indicate the optic axis rotation of the anisotropic substrate leads to controlling the intensity of the lens focuses.
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