Abstract
Plasmonic Nano-Antenna Array (PNA) on periodic thin film is analyzed in this paper. Such an inhomogeneous thin film is a periodic structure with two different isotropic materials. Changing these materials leads to obtaining a reconfigurable anisotropic dielectric. This anisotropic dielectric is used as a thin film of a PNA. Such a 2D lattice consists of plasmonic double-square rings shaped nano-antennas. For analysis a complicated structure, the optic axis of anisotropic thin film is chosen to be perpendicular to the PNA's surface. In this analysis, Galerkin version of Periodic Method of Moments ( $PMoM$ ) is used in which, the dyadic Green's function is calculated by a model of Transmission Line (TL) by considering the plasmonic effects. Using PMoM-TL approach, the effective surface current densities on nano-antennas are calculated. In the spectral domain, the information of the scattered fields are also evaluated. The analytical results are compared with simulation ones obtained by a commercial FEM based-EM solver for validation. Using such a structure, one can obtain a reconfigurable optical filter without changing the dimensions of the metallization.
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