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 re- fractions for both circular polarization (CP) and linear polari- zation (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 transmis- sion angle after passing through the metasurface with a high conversion efficiency of 87.5 %. The concept of single anom- alousrefractioncanbeexploitedforcreatinghigh-performance