Metasurface acting as an asymmetric absorber: wave beam incident on a periodically modulated surface is reflected back (purple), or creates a sum of evanescent harmonics which are completely absorbed (red).

From the article:

Extreme Asymmetry in Metasurfaces via Evanescent Fields Engineering: Angular-Asymmetric Absorption
Xuchen Wang, Ana Díaz-Rubio, Viktar S. Asadchy, Grigorii Ptitcyn, Andrey A. Generalov, Juha Ala-Laurinaho, and Sergei A. Tretyakov
Phys. Rev. Lett. 121, 256802 (2018)

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