Figure 3: Schematics and experimental realizations illustrating the versatility of the self-assembly methodology.

(a–d) Schematics and fluorescence images of differentially photo-crosslinked and self-assembled SU-8 geometries. (a) A cylindrical mesh with hollow rectangular micropatterns and a uniform radius of curvature was self-assembled by creating a uniform CLG across the entire SU-8 film. (b) Patterned and unpatterned cubes were self-assembled with CLG hinges and flat, high-crosslinked square faces. (c) An SU-8 sheet exhibiting bidirectional curvature was self-assembled with high-crosslinked square faces and both top and bottom exposed CLG hinges. (d) A hybrid SU-8/PDMS microfluidic device was self-assembled using a CLG-containing SU-8 layer to curve an underlying PDMS channel. Red lines indicate a segment of the hollow microfluidic channel. (e,f) Brightfield images of a free-floating bidirectionally folded sheet with micrometer-scale gold SRRs patterned on the square faces. The sheet was reversibly self-assembled such that the SRRs were either (e) in a single plane when the structure flattened in acetone, or (f) arranged along the x, y and z axes when the structure was de-solvated. Insets show magnified views of representative regions from the same film. Scale bars are 250 μm (a–d; e,f insets), 3 mm (e,f).