Figure 5: The flexibility and versatility in wavefront manipulations. | Nature Communications

Figure 5: The flexibility and versatility in wavefront manipulations.

From: Highly efficient and ultra-broadband graphene oxide ultrathin lenses with three-dimensional subwavelength focusing

Figure 5

(a–d) Bending and twisting of the GO thin film on a polydimethylsiloxane substrate. (e,f) Microscopic images of Swinburne logo fabricated on the GO thin film before (e) and after (f) bending. Scale bar, 10 μm. (g,h) Microscopic images of the GO lens array at the focusing plane before (g) and after (h) bending. Scale bar, 30 μm. Insets: microscopic images of the GO lens array fabricated on the GO film. (i) Diffraction image of a two-dimensional grating, retrieved by using three beams at wavelength of 405, 561 and 633 nm simultaneously. Inset: microscopic image of the two-dimensional grating fabricated on the GO film. Scale bar, 20 μm. (j) Comparison of the single focal spot (left column) and multi-foci GO lenses (right column). The designs are shown schematically (top panel) and the focal intensity distributions along the axial directions are characterized experimentally (bottom panel). Scale bar, 2 μm.

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