Polarization Insensitive Multiband Electromagnetically Induced transparency -Like Metamaterials*

In this paper, we studied a sandwich metamaterial consisting of a dielectric substrate and a front and back metal structure with rotational symmetry. The transmission of the structure was calculated by finite-integral time-domain(FITD) method. The result was shown that the structure has multi-band electromagnetically induced transparency(EIT) -like effect. Through the comparative study of the electric field distribution and the transmission of part of the structure, it was found that the two bright modes are coupled to the dark mode realized the multi-band EIT in the structure. The results of the structure have potential applications in refractive index sensing, multi-frequency filter and microwave communication.