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    From Cell to Barbule the Optics of Iridescent Bird Feathers

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    Author
    Piatt, Georgia
    Issue Date
    2018
    Keywords
    Bird
    Birds of Paradise
    Birds of Paradise Ornament
    iridescent thin film
    Structural color
    Thin Film
    Advisor
    Koshel, Richard J.
    
    Metadata
    Show full item record
    Publisher
    The University of Arizona.
    Rights
    Copyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction, presentation (such as public display or performance) of protected items is prohibited except with permission of the author.
    Abstract
    There are brightly colored birds spanning the globe. These fabulous animals get their colors from a variety of different sources. Some birds use pigments while others have specialized shapes and forms creating optical phenomena such as thin-films, and photonic crystals among others; within the cells of their feathers to reflect and refract light to create vibrant colors. The spectacular Bird-of-paradises’ feathers are just as incredible as the birds themselves. The male Parotia wahnesi Bird-of-paradise puts on an elaborate show to attract a mate, part of this show is flashing an iridescent ornament from under his chin called a breast ornament. To the female sitting on the branch above the male, it is a brilliant yellow, but when the ornament is flush against the bird, it reflects a variety of colors from purple to green. The colors from the ornament feather, can be modeled as a structured thin film using non-sequential optics software. The models tested were created from a digitized shape of a cell and barbule of the ornament feather. There is a combination of .05µm of melanin with a refractive index of n = 2+.01i and .128µm of keratin with a refractive index of n=1.5 in 31 alternating layers overlaid on the topography of the bottom of the barbule. The outer shell of the cell is created by a single 21µm layer of keratin. Together this created a vivid color pattern which closely matches measurements and observation in the real world. In contrast to the vivid Whanes’s Parotia, the white tip of a Mourning Dove flight feather is also examined. The feather, composed of keratin and air, lacking any organization as well as any recognizable outer structure.
    Type
    text
    Electronic Thesis
    Degree Name
    M.S.
    Degree Level
    masters
    Degree Program
    Graduate College
    Optical Sciences
    Degree Grantor
    University of Arizona
    Collections
    Master's Theses

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