Fig. 5: UV-induced PC-type grating structures.
a Optical micrographs of sections of vertical PC grating samples (top) and tilted PC grating samples (bottom). Left scale bars:10 μm, right scale bars: 50 μm. b Optical photographs of a 10 μm bar PC grating, a 3 μm bar PC grating, a 10 μm dot PC grating, and a 5 μm ring PC grating. Pictures share the same scale bar: 10 μm. c Schematic diagram of the structural color principle of the PC grating. θi represents the angle of the incident light. d represents the spacing between the PC gratings. d Patterns with different structural colors are created by superimposing a macro photomask with a grating pattern photomask. e Photographs of PC gratings with different color patterns. Pictures share the same scale bar: 1 cm. f Transmission spectra of the sample with vertical PC grating at different angles and optical photographs of the corresponding structural color changes. θs represents the rotation angle of the film. g Scrambling and recovering PC grating-type 2D code pattern by shape memory effect. Scale bars: 1 cm.
