Butterfly wing colors depend not on pigment within the wings but on the effect of light on microscopic structures on the wing surfaces. Although this has been understood for some time, it has been impossible to replicate the colors artificially. Mathias Kolle and his colleagues from the University of Cambridge have invented a way to manufacture the tiny color-producing structures.
Electron micrograph of natural butterfly wing: This scanning electron micrograph shows that the surface of a wing scale is covered with concavities.
Credit: Mathias Kolle, University of Cambridge
Electron micrograph of artificial structure: This SEM image of concavities is covered by a conformal multilayer stack of 11 alternating layers of titania and alumina.
Credit: Mathias Kolle, University of Cambridge
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