Figure 2

Optical microscopy images of the top view of negative molds made of PDMS (1, 2, 5, 6, 9–15) and Si (7, 8) substrates (Magnification: 1, 2, 5, 6 200 × ,7–15 400 ×). Confocal microscopy images of the top view of negative molds made of Si (3,4) substrates (Magnification: 3, 4 200 ×) (Scale bar = 100 μm).