The nanoscale structures inspired by the natural catenaries can achromatically spin light wave.

Digital optical holograms can achieve nanometer-scale resolution thanks to recent advances in metasurface technologies. This has raised hopes for applications in data encryption, data storage, information processing and displays. However, the hologram bandwidth has remained too low for any practical use. To overcome this limitation, information can be stored in the orbital angular momentum (OAM) of light, as this degree of freedom has an unbounded set of orthogonal helical modes that could function as information channels. Thus far, OAM holography has been achieved using phase-only metasurfaces, which however are marred by channels crosstalk. As a result, from the corresponding authors upon reasonable request.

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