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Metasurfaces based on sub-wavelength patterning have major potential for realizing arbitrary control of the wavefront of
the diffracted light by achieving local control of the phase amplitude and polarization. We discuss novel devices based
on this technique; a salient feature is the ability to create often with a single digital mask an arbitrary analog phase
profile. A variety of flat optical components, including lenses, polarizers, vortex plates, coatings, holograms and couplers
with polarization invariant coupling efficiency will be presented.
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