Browsing by Subject "Multifunctional Fiber"

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    Bio-inpired all-polymer 2d photonic crystal fibers = Doğadan esinlenilmiş tamamen polimer 2B fotonik kristal fiberleri
    (2014) Doğan, Tamer
    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.