High-Efficiency Cross Polarization Converters by Plasmonic Metasurface

We have proposed a carefully designed metasurface constructed by the elongated apertures in gold film. This metasurface structure can support only single anomalous refractions for both circular polarization (CP) and linear polarization (LP) incidence, which is also following the generalized Snell's law, whereas the normal refraction can be completely suppressed nearly. Furthermore, the circularly polarized light converted to cross-polarized light and the linearly polarized light decomposed into two CP states with opposite transmission angle after passing through the metasurface with a high conversion efficiency of 87.5 %. The concept of single anomalous refraction can be exploited for creating high-performance wave plate.