Fig. 5: SEM images of the metasurface and diagram of the experimental optical path. | npj Nanophotonics

Fig. 5: SEM images of the metasurface and diagram of the experimental optical path.

From: Highly-accurate manipulation of focal length for circular Airy beams

Fig. 5: SEM images of the metasurface and diagram of the experimental optical path.

a SEM image of the metasurface and b its magnified view. c Diagram of the experimental optical path. QWP: quarter-wave plate. MS: metasurface. The microscopic measurement system consists of an objective lens, a tube lens, and a CCD camera. The metasurface is installed on a linear motor stage that moves along the z-direction. d Picture of the experimental optical path.

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