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(a) The fabrication process for Ni–Co mold; (b) the homemade hot-embossing machine for rapidly generating arrays of nanostructures on an A4 size plastic film; (c) the optical image of the replicated nanostructure (left) and capped aluminum nanoslit arrays (right) on an A4 size polycarbonate film. There are 416 arrays and the area of each periodic nanostructure is 5 × 5 mm2; (d) the SEM (left), AFM (middle), and cross-sectional profile (right) of the capped aluminum nanoslits.
