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Schematic of metasurface narrowband filtering [144]. (a) Pixelated metasurface image. (b) SEM micrograph. (c) Diagram of the imaging system. (d–e) Reflection images of the pixelated metasurface recorded at four specific wave numbers. Reproduced with permission [144]. (a–e) Copyright 2018, American Association for the Advancement of Science.
