Fig. 3. Cross-sectional HR-SEM images of PR column arrays with different pitches of (a) 3 μm, (b) 5 μm, and (c) 10 μm, coated with the cured PDMS : hexane (1 : 10) solution. The red arrow in (a) indicates the breaking of the PDMS thin film covered on the flat-top of the PR columns – inserted image in (b) – which was caused by breaking the sample for SEM observation. Scale bars represent 2 μm.
