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Photonic structures
Structural color is a type of coloration that arises from the interaction of light with nano-sized structures. This interaction is possible because these photonic structures are of the same size as the wavelength of light. Through a mechanism of constructive and destructive interference, certain colors get amplified, while others diminish.

Photonic structures are abundant in nature, existing in a wide range of organisms. Different organisms use different structures, each with a different morphology designed to obtain the desired effect. Examples of this are the photonic crystal underlying the bright colors in peacock feathers or the tree-like structures responsible for the bright blue in some Morpho butterflies.

An example of bio-inspired photonics using structures is the so-called moth eye. Moths have an structure of ordered cilinders in their eyes that don't produce color, but instead reduce reflectivity. This concept has led to creation of antireflective coatings.