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.
|Advisor:||Koshel, Richard J.|
|Commitee:||Harvey, Todd A., Sasian, Jose|
|School:||The University of Arizona|
|School Location:||United States -- Arizona|
|Source:||MAI 58/03M(E), Masters Abstracts International|
|Keywords:||Bird, Birds of paradise, Birds-of-paradise ornament, Iridescent thin film, Structural color, Thin film|
Copyright in each Dissertation and Thesis is retained by the author. All Rights Reserved
The supplemental file or files you are about to download were provided to ProQuest by the author as part of a
dissertation or thesis. The supplemental files are provided "AS IS" without warranty. ProQuest is not responsible for the
content, format or impact on the supplemental file(s) on our system. in some cases, the file type may be unknown or
may be a .exe file. We recommend caution as you open such files.
Copyright of the original materials contained in the supplemental file is retained by the author and your access to the
supplemental files is subject to the ProQuest Terms and Conditions of use.
Depending on the size of the file(s) you are downloading, the system may take some time to download them. Please be