The Troides magellanus butterfly exhibits iridescence when both viewed and illuminated at near grazing incidence. The effect derives from a complex bigrating structure that provides exquisite control over both the viewing angles and colour observed.
© 2001 Optical Society of America
C. Lawrence, P. Vukusic, and J. R. Sambles, " Tailored iridescence from butterfly wings: constrained diffraction gratings," in Optical Interference Coatings, OSA Technical Digest Series (Optical Society of America, 2001), paper TuE7.
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