Zhijie Ma, Stephen M. Hanham, Yandong Gong, and Minghui Hong, "All-dielectric reflective half-wave plate metasurface based on the anisotropic excitation of electric and magnetic dipole resonances," Opt. Lett. 43, 911-914 (2018)
We present an all-dielectric metasurface that simultaneously supports electric and magnetic dipole resonances
for orthogonal polarizations. At resonances, the metasurface reflects the incident light with nearly perfect efficiency and provides a phase difference of π in the two axes, making a low-loss half-wave plate in reflection mode. The polarization handedness of the incident circularly polarized light is preserved after reflection; this is different from either a pure electric mirror or magnetic mirror. With the features of high reflection and circular polarization conservation, the meta-mirror is an ideal platform for the geometric phase-based gradient metasurface functioning in reflection mode. Anomalous reflection with the planar meta-mirror is demonstrated
as a proof of concept. The proposed meta-mirror can be a good alternative to plasmonic metasurfaces for
future compact and high-efficiency metadevices for polarization and phase manipulation in reflection mode.