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Published on: June 17, 2020
Reflections on iridescent neck and breast feathers of the peacock, Pavo cristatus
Pascal Freyer1, Bodo D Wilts2, Doekele G Stavenga1
1Computational Physics, Zernike Institute for Advanced Materials, University of Groningen, 9747 AG Groningen, The Netherlands.
Abstract:
The blue neck and breast feathers of the peacock are structurally coloured due to an intricate photonic crystal structure in the barbules consisting of a two-dimensionally ordered rectangular lattice of melanosomes (melanin rodlets) and air channels embedded in a keratin matrix. We here investigate the feather coloration by performing microspectrophotometry, imaging scatterometry and angle-dependent reflectance measurements. Using previously determined wavelength-dependent refractive indices of melanin and keratin, we interpret the spectral and spatial reflection characteristics by comparing the measured spectra to calculated spectra by effective-medium multilayer and full three-dimensional finite-difference time-domain modelling. Both modelling methods yield similar reflectance spectra indicating that simple multilayer modelling is adequate for a direct understanding of the brilliant coloration of peacock feathers.
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