Fig. 4: Patterning experiments.

a SEM image of a laser-written structure consisting of five lines, illustrating controlled inhibition of polymerization. The curing laser was on continuously for all five lines whereas the inhibition laser was off while writing the first line (topmost), turned on one, two, and three times while writing the second, third, and fourth lines, respectively, and was continuously on during writing of the fifth line. Colored lines correspond to the laser paths (blue for the curing laser λ = 435 nm, pink for the inhibition laser λ = 355 nm). The dots visible on the left side of the fifth line correspond to a short deactivation of the inhibition laser in order to mark the position of the laser path. b Greyscale experiment—height profile of the obtained structure. c Dose-dependent variation in the depth of the formed valleys.