Metasurfaces offered great opportunities to control electromagnetic (EM)waves, but currently available meta-devices typically work either in purereflection or pure transmission mode, leaving half of EM space completelyunexplored. Here, we propose a new type of metasurface, composed byspecifically designed meta-atoms with polarization-dependent transmission andreflection properties, to efficiently manipulate EM waves in the full space. Asa proof of concept, three microwave meta-devices are designed, fabricated andexperimentally characterized. The first two can bend or focus EM waves atdifferent sides (i.e., transmission/reflection sides) of the metasurfacesdepending on the incident polarization, while the third one changes from a wavebender for reflected wave to a focusing lens for transmitted wave as theexcitation polarization is rotated, with all these functionalities exhibitingvery high efficiencies (in the range of 85%-91%). Our findings significantlyexpand the capabilities of metasurfaces in controlling EM waves, and canstimulate high-performance multi-functional meta-devices facing morechallenging and diversified application demands.
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