Fig. 2: Fabrication, harvesting, and photoinduced rolling of pDR1M thin platforms.

A Manufacturing process: a drop of polymer solution is molded thanks to a PDMS stamp onto a substrate coated with a sacrificial layer (i, ii); then, after a short oxygen plasma etching, the patterned structures are released from the substrate through sacrificial layer dissolution and collected (iii, iv). B pDR1M structures of various sizes and shapes, before (i, ii) and after releasing (iii). The top line shows optical microscopy images (fluorescent imaging with excitation/emission at 545/620 nm), while colored SEM images are depicted at the bottom. C Light-induced rolling of the fabricated pDR1M platforms: an optical image of irradiated and not irradiated 6 µm by 9 µm rectangles in water (i), a colored SEM image of a rolled 6 µm by 6 µm structure after drying (ii), and a confocal microscopy image of two rolled 6 µm by 6 µm structures in water (iii, excitation/emission at 561/615 nm), where a representation of the microtubes orientation is illustrated in the white dotted inset. The pDR1M platforms were rolled using fluorescent light filtered at 545 nm for 3 s (12.5 mW mm⁻²).