Figure 5.

SEM images of (a) an NFL structured in silicon (Schroer et al., 2005 ▸), (b) an FZP made out of gold with typical layer height from 0.85 to 1 µm and smallest outermost zone width of 50 nm (Gorelick et al., 2011 ▸), and (c) an MLL (Bajt et al., 2018 ▸).