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Schematic illustration of the bilayer hydrogel microlens array.
Hydrogel microlens fabrication process.
Testing the transparency of the hydrogel microlens array at different temperatures (a) at and (b) at . Scale bar, 3 mm.
(a) Micrographs of a cylindrical sensitive hydrogel at different levels. (b) Free-swelling diameter of sensitive hydrogel vs . (c) Focal length measurement setup. (d) Measured focal length vs values and comparison with theoretical calculations.
Micrographs of microlens array in different environments. Insets show close-up tilted images.
Dry out experiment comparing the hydrogel with (right) and without (left) glycerol at room temperature. Dye has been added to provide contrast. Scale bar, 2 mm.
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