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DescriptionPeacock plumage closeup.jpg
Many of the brilliant colours of the peacock plumage are due to an optical interference phenomenon (Bragg reflection) based on (nearly) periodic nanostructures found in the barbules (fiber-like components) of the feathers.
Different colours correspond to different length scales of the periodic structures.
Such interference-based structural colour is especially important in producing the peacock's iridescent hues (which shimmer and change with viewing angle), since interference effects depend upon the angle of light, unlike chemical pigments.
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This image, originally posted to Flickr, was reviewed on 23 October 2009 by the administrator or reviewerRaeky, who confirmed that it was available on Flickr under the stated license on that date.
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