Journal
JOURNAL OF THE ROYAL SOCIETY INTERFACE
Volume 12, Issue 105, Pages -Publisher
ROYAL SOC
DOI: 10.1098/rsif.2014.1354
Keywords
structural colour; spatial shift colour appearance; photonic crystal; multi-layered rigorous coupled-wave analysis
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Funding
- MOST [103-2221-E-008-002]
- AFOSR [FA9550-10-1-0020]
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A range of iridescent colour appearances are presented by male Swinhoe's pheasants' (Lophura swinhoii) mantle feathers. Two distinct regions of the open pennaceous portion of its feathers display particularly conspicuous angle-dependent reflection. A bright blue band appears in one region at normal incidence that spatially shifts to another at higher illumination angles. The two-dimensional photonic crystal-like nanostructures inside the barbules of these two regions are similar. However, this study found that the spatial variation in their colour appearance results from a continuously changing orientation of barbules with respect to the alignment of their associated barb. Amulti-layered rigorous coupled-wave analysis approachwas used to model the reflections from the identified intra-barbule structures. Well-matched simulated and measured reflectance spectra, at both normal and oblique incidence, support our elucidation of the origin of the bird's distinctive feather colour appearance.
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