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| Sample fabrication technique for copying the structural colour of Papilio blumei. a) Deposition of polystyrene colloids on a gold-coated silicon substrate. b) Growth of platinum or gold in the interstices of the
colloidal array by electro-plating. The metal deposition is terminated when the thickness of the deposited film equals the microsphere radius. c) Removal of
the polystyrene spheres from the substrate by ultrasonication in acetone. d) Sputtering of a thin carbon film and ALD of a stack of 11 alternating TiO2 and
Al2O3 layers (arrows indicate the precursor gas flow). e,f) In a second route, the colloids are molten to cover the cavities with a homogeneous film (e) which is covered by a TiO2-Al2O3 multilayer (f). (Courtesy: Mathias Kolle) |
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