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Laser triggered sequential folding of microstructures
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View: Figures


Image of FIG. 1.
FIG. 1.

Conceptual schematic and experimental realization of laser actuated folding. (a) Schematic showing the fabrication scheme for the microstructures. Flexible Cr/Au bilayer hinges alternate with rigid Au segments. A polymer trigger is patterned atop the flexible hinges. Bending occurs when the polymer is softened on heating by laser irradiation. (b) and (c) Optical microscopy images of a 532 nm laser inducing folding of microstructures. Actuation at different scales is possible by focusing or broadening the laser spot. (b) Multiple microgrippers are closed at once by a laser beam. Scale bar is 500 μm. Insets show schematics of open and closed grippers. (c) Individual microgrippers are closed sequentially. Scale bar is 1 mm.

Image of FIG. 2.
FIG. 2.

Characterization of laser-triggered folding of microdevices. (a) Graph showing the time to close tc versus distance of the laser from the microstructure, d. (b) Graph showing tc versus laser irradiance (Ir ), from a visible (green diamonds) and near-IR (purple triangles) laser.

Image of FIG. 3.
FIG. 3.

Sequential folding with spatial control. (a) Schematic of a four-membered structure folded sequentially. (b) Optical microscopy images of sequential actuation of individual hinges within a single four-membered structure using a 532 nm laser. Scale bar is 1 mm.

Image of FIG. 4.
FIG. 4.

Sequential folding of nested cubes. (a) Schematic and (b) optical microscopy images of the sequential folding of two patterned cruciforms into nested cubes, triggered by a low power 532-nm laser. Scale bar is 1 mm.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Laser triggered sequential folding of microstructures