Grazing-incidence iridescence from a butterfly wing |
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Authors: | Lawrence Chris Vukusic Peter Sambles Roy |
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Affiliation: | Defence Evaluation and Research Agency, Farnborough, Hants, United Kingdom. crlawrence@qinetiq.com |
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Abstract: | The Troides magellanus butterfly exhibits a specialized iridescence that is visible only when its hind wings are both illuminated and viewed at near-grazing incidence. The effect is due to the presence of a constrained bigrating structure in its wing scales that has been previously observed in only one other species of butterfly (Ancyluris meliboeus). However, whereas the Ancyluris presents wide-angle flickering iridescence, the Troides butterfly uses pigmentary coloration at all but a narrow tailored range of angles, producing a characteristic effect. |
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