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SEM of the metasurface consisting of a rectangular array of poly-Si cylinders on a quartz substrate (a) and the measured (solid lines) and modelled (dashed lines) reflectivity for light propagating along z and polarized along x and y (b). At 1.55 μm, the anisotropic metasurface efficiently reflects light polarized along x while transmitting light polarized along y, and thus functions as a polarization splitter. (Online version in colour.)
