Artificially structured surfaces, or metasurfaces, have their functionality defined by the actual structure. Quite often the desired electromagnetic properties are achieved just in a narrow frequency range, because the employed components are resonant. In this work, the authors from China propose to use complex resonant elements to create a metasurface that can be useful in three different frequency ranges. In fact, the same metasurface can generate optical vortices at three different frequencies. The design allows to create vortices of either the same or different optical angular momentum at those specified frequencies. The metasurface operates in reflection mode, and provides very high conversion efficiency.

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