Figure 4
Photographs showing the transparency of Ti films on PDMS substrates. (a) Ti films with thicknesses of 180 nm (upper) and 250 nm (lower) on PDMS substrates at zero strain (left) and 30% strain (right) covering only half of the paper design underneath. (b) A 250-nm-thick Ti film on PDMS substrate wrapped around a transparent cylinder with a radius of curvature of 11 mm. Yellow dotted lines are drawn along the boundaries between the sample-overlaid areas and the bare areas.