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    Coherent light scattering of ultraviolet light by avian feather barbs

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    Torres_Auk_120(1)163.pdf (245.8Kb)
    Issue Date
    2003-04-05
    Author
    Prum, Richard O.
    Andersson, Staffan
    Torres, Rodolfo H.
    Publisher
    University of California Press
    Type
    Article
    Article Version
    Scholarly/refereed, publisher version
    Metadata
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    Abstract
    Ultraviolet (UV) structural colors of avian feathers are produced by the spongy medullary keratin of feather barbs, but various physical mechanisms have been hypothesized to produce those colors, including Rayleigh scattering, Mie scattering, and coherent scattering (i.e. constructive interference). We used two-dimensional Fourier analysis of transmission electron micrographs of the medullary keratin of UV-colored feather barbs of the Blue Whistling Thrush (Myiophonus caeruleus) (Turdidae) to test the alternative hypotheses for production of those UV structural hues. The two-dimensional Fourier power spectra of the tissue reveal a ring-like distribution of peak periodicity at intermediate spatial frequencies (∼0.078 nm −1), which documents that Myiophonus medullary keratin is substantially nanostructured and equivalently ordered in all directions. This nanoscale spatial order falsifies a basic assumption of both the Rayleigh scattering and Mie scattering. A predicted reflectance spectrum based on the Fourier power spectra matches hue of the measured reflectance spectra of the feathers (345 nm). These results demonstrate that the Myiophonus medullary keratin is ordered at the appropriately nanoscale to produce the observed UV hues by coherent scattering.
    Description
    This is the published version, also available here: http://dx.doi.org/10.1642/0004-8038(2003)120[0163:CSOULB]2.0.CO;2.
    URI
    http://hdl.handle.net/1808/17227
    DOI
    https://doi.org/10.1642/0004-8038(2003)120[0163:CSOULB]2.0.CO;2
    Collections
    • Mathematics Scholarly Works [282]
    Citation
    Prum, Richard O., Andersson, Staffan., Torres, Rodolfo H. "Coherent light scattering of ultraviolet light by avian feather barbs." The Auk 120(1):163-170. 2003. http://dx.doi.org/10.1642/0004-8038(2003)120[0163:CSOULB]2.0.CO;2.

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    Lawrence, KS 66045
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    Contact KU ScholarWorks
    785-864-8983
    KU Libraries
    1425 Jayhawk Blvd
    Lawrence, KS 66045
    785-864-8983

    KU Libraries
    1425 Jayhawk Blvd
    Lawrence, KS 66045
    Image Credits
     

     

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