Ankara : The Graduate School of Engineering and Science of Bilkent University, 2014.Thesis (Master's) -- Bilkent University, 2014.Includes bibliographical references leaves 56-65.Photonic crystals are essential part of the integrated systems which require manipulation
of light in a manner that all-optical polarization and re
ection properties
are completely calibrated to necessary levels. However, beyond scienti c
development of photonic crystals, biological systems also provided inspiration for
the eld since they perfected the mechanisms in terms of coloration over millions
of years. In addition, natural samples are also observed to serve and function for
more than single purpose, and this further illuminates the technological designs
so as to develop multifunctional structures. Anas Platyrhynchos L. (mallard) is
one of the natural examples and detailed investigations yield that its neck feathers
have structural coloration, iridescence and hydrophobicity.
Being inspired form mallard duck, two-dimensional photonic crystal bers
are produced to imitate coloration and surface architecture. The fabrication is
established by iterative size reduction technique which, as a top-down method,
enables design of nano-scale materials from macro-scale structures. To accurately
imitate duck feathers, polycarbonate (PC) and polyvinyldi
uoride (PVDF), are
characterized and selected for their thermal compatibility and dielectric properties
among number of polymers.
Produced 2D photonic crystal bers have been demonstrated to re
ect color
of green like duck feathers, and also shown to have iridescence by optical means.
Besides single coloration, all colors of visible spectrum are also obtained to attest
potential applicability of fabrication technique and produced bers. It is
also substantiated that all colors can be obtained in a single ber by tapering a
thick ber. In addition, last but not least, 2D photonic crystal bers are carefully
designed to have surface roughness which promoted hydrophobic feature of PVDF and provided better hydrophobicity than natural counterparts. Manufactured
structures are also the rst demonstration for production of all-polymer
two dimensional photonic crystal bers which may be used in textile or ltering
technologies.Doğan, TamerM.S
