Broadband Huygens’ Metasurface Based on Hybrid Resonances

Huygens' metasurfaces are interesting, as they can modify transmitted wave fronts with negligible reflection. To achieve perfect broadband transparency of a Huygens' surface, the authors design a meta-atom based on two shifted split-ring resonators with particular eigenmodes, with the shift canceling magnetoelectric coupling and bringing the electric and magnetic responses into resonance at the same frequency. Broadband transparency with frequency-dependent phase shifting within full 360\ifmmode^\circ\else\textdegree\fi{} coverage is observed, numerically and experimentally, in the microwave range. This meta-atom could be used in high-efficiency polarization converters, beam splitters, and other optically thin devices.