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Metasurfaces are planar structures that locally modify the polarization,phase, and amplitude of light in reflection or transmission, thus enablinglithographically patterned flat optical components with functionalitiescontrolled by design. Transmissive metasurfaces are especially important, asmost optical systems used in practice operate in transmission. Several types oftransmissive metasurfaces have been realized, but with either low transmissionefficiencies or limited control over polarization and phase. Here we show ametasurface platform based on high-contrast dielectric elliptical nano-postswhich provides complete control of polarization and phase with sub-wavelengthspatial resolution and experimentally measured efficiency ranging from 72% to97%, depending on the exact design. Such complete control enables therealization of most free-space transmissive optical elements such as lenses,phase-plates, wave-plates, polarizers, beam-splitters, as well as polarizationswitchable phase holograms and arbitrary vector beam generators using the samemetamaterial platform.

Dielectric Metasurfaces for Complete Control of Phase and Polarization with Subwavelength Spatial Resolution and High Transmission