Design of a Beam-Tilting Metasurface Polarizer Using Surface Field Optimization

In this work, the design of a locally lossless and passive anisotropic metasurface performing an anomalous refraction and a linear-to-circular polarization conversion is presented, using a numerically efficient surface field optimization. The metasurface consists of the cascade of three patterned metallic layers, modeled through homogenized impedance sheets. A certain number of evanescent Floquet modes are introduced through an optimization procedure aiming at minimizing the real part of the three sheet impedances. Numerical results show an almost perfect anomalous refraction without reflection and an efficient linear-to-circular polarization conversion.