Although the physics of structural color has been investigated, it remains a challenge to create artificial replicas of the natural photonic crystal structure. The concave multilayer replica of Papilio blumei butterflies is successfully fabricated by the following three main steps: self assembly of polystyrene spheres, deposition using an electron-beam gun, and inductively coupled plasma etching. The green iridescence of the wings of P. blumei is successfully reproduced.
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