Simultaneous TE and TM designer surface plasmon supported by bianisotropic metamaterials with positive permittivity and permeability

Abstract

Abstract Surface plasmon polaritons (SPPs) are surface modes existing at the interface between a metal and a dielectric material. Designer SPPs with a customer-defined property can be supported on the surface of suitably engineered metallic structures. They are important for various applications, ranging from chemical sensing to super-resolution imaging. In conventional systems, SPPs are transverse magnetic (TM) polarized, because of their origin in the collective electron oscillation along the surface. In this work, we show that both transverse electric (TE) and TM designer surface plasmons can be supported at the interface between a suitably designed bianisotropic metamaterial and a normal dielectric material without involving either negative permittivity or negative permeability. We further propose a realistic bianisotropic metamaterial for implementation of the double surface modes. The bianisotropic metamaterial demonstrated here may have tremendous applications in optical information processing and integrated photonic devices.