Metasurfaces have shown promise for the miniaturization of a wide variety of different optical components and have attracted significant interest for their ability to manipulate and control polarized light in a spatially-varying fashion. This capability, however, is not unique to metasurfaces. Several past technologies have been envisioned that spatially-varying control over polarized light. A scheme for classifying these is given, enabling rigorous comparison of the polarization control enabled by each. Moreover, Jones matrix holography, a concept which generalizes past design strategies for these elements, is introduced, and examples of new devices enabled by this generalized viewpoint are shown using metasurfaces.
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