Fig. 7From: All-Dielectric Phase-Gradient Metasurface Performing High-Efficiency Anomalous Transmission in the Near-Infrared RegionPhase distribution of a phase-gradient metasurface consisting of different element numbers. a Nine-element metasurface. b Eight-element metasurface. c Seven-element metasurface. d Five-element metasurface. e Four-element metasurface. f Three-element metasurface. d–f depict two periods to better show the anomalous transmission effect. The detailed parameters are shown in Table 3Back to article page