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. 2015 Nov 18;5:16637. doi: 10.1038/srep16637

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(a) The image from the scale of a real Morpho didius butterfly wing. (b) The color image from an 11-layer lamellae structure on Si, showing the complementary color of blue and green. (c) The image from the same pattern as in (b) but on quartz substrate with slightly thinner layer thicknesses than designed values, showing purer blue. (d) The image of patterned area with the same layer structure as above and corrected thicknesses, showing the blue closer to the real one in (a). (e,f) The images from patterned areas for green color with 11 layers and 15 layers, respectively. (g) The image showing dark red color from the patterned area with 1.5-μm pitched ridge gratings without PMMA/Air branches. The scaling bar in all the images is 100 μm.