Figure 5 | Light: Science & Applications

Figure 5

From: Beam switching and bifocal zoom lensing using active plasmonic metasurfaces

Figure 5

Experimental results for the cylindrical bifocal lens. (a) Camera pictures of the cylindrical bifocal lens imaged at different distances z from the metasurface. Since the design is for a cylindrical lens, only the x-direction is focused. In the amorphous case, a bright line appears at z=0.5 mm, whereas the image shows broad diffuse lightness at the same z position in the crystalline case. At z=1 mm the bright line focus appears in the crystalline case whereas one can only observe a light patch in the amorphous case. This is in very good agreement with the theory. (b) SEM micrograph of a portion of the fabricated cylindrical metasurface lens.

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