Electric and magnetic dipole moments in super cell dielectric meta-surface

Abstract

Two dimensional all dielectric grating metamaterial based on polydimethylsiloxane and TiO2 materials were prepared via sputtering method in two different configurations as PDMS/TiO2 (50 nm)) and 2D grating (etalon) TiO2 (50 nm)/PDMS/TiO2 (50 nm). As it was measured by a charged coupled device (CCD) camera, the hotspots confirm four points symmetry of the structure and also the refractive index falls in the negative part to show meta state. In addition, the absorption spectra show the clear separation between electric dipole (ED) and Magnetic dipoles (MD) by enhancing the incidence angle onto the sample. We noted the gradual increase in the angle begins to appear and became more noticeable from 52o to 60o and the reason for this separation at these angles may be the fall of the beam at an oblique angle, and it is clear that inclination at an oblique angle leads to a more pronounced metamaterial behavior.