Fabrication of novel core-shell nanostructures for photonics applications

buir.advisorBayındır, Mehmet
dc.contributor.authorKhudiyev, Tural
dc.departmentGraduate Program in Materials Science and Nanotechnologyen_US
dc.descriptionAnkara : Materials Science and Nanotechnology Program of the Graduate School of Engineering and Science of Bilkent Univ., 2013.en_US
dc.descriptionThesis (Ph. D.) -- Bilkent University, 2013en_US
dc.descriptionIncludes bibliographical references leaves 169-182.en_US
dc.description.abstractDevelopments in nanoscale fabrication and characterization techniques have led to fundamental changes in the scientific understanding of many fields, and novel nanostructures have been utilized to investigate the conceptual underpinnings behind a diverse array of natural phenomena. However, nanofabrication methods are frequently hindered by issues such as misalignment, small batch sizes, high production costs and constraints in material choice or nanostructure diversity, which decrease their potential utility and prevent their widespread application in nanoscale optics and photonics. In this work, a new top-down nanofabrication method is described, which is called Iterative Size Reduction (ISR), where step-by-step reduction is utilized to decrease structure dimensions from macro- to nanosizes and produce indefinitely long one-dimensional core-shell nanostructures with properties highly suitable for use in optical applications. Plateau-Rayleigh instabilities are then utilized to thermally degrade ISR-produced nanowire arrays into complex core-shell schemes, which are produced successively in a hitherto-undescribed transitory region between core-shell nanowires and core-shell nanospheres. A diverse array of optical phenomena have been observed on fabricated novel core-shell nano-platforms, which are utilized in the design of novel nanostructures for emerging photonics applications. Briefly, (a) the resonant Mie scattering behavior is characterized on glass-polymer nanostructures and these nanostructures are designed for large-area structural coloration, (b) a novel non-resonant Mie scattering regime responsible for the scattering characteristics exhibited by all-polymer core-shell nanowires is described, (c) a nanoscale analogue to the thin film interference phenomenon is demonstrated that occurs on the core-shell boundary of ISR-produced micro- and nanostructures, (d) an unusual photonic crystal structure observed in the neck feathers of mallard drakes is investigated and imitated, (e) a series of all-polymer core-shell nanowires to function as novel light-trapping platforms and sensors are engineered and (f) the generation of supercontinuum light in well-ordered arrays of As2Se3 nanowires is reported.en_US
dc.description.statementofresponsibilityKhudiyev, Turalen_US
dc.format.extentxxx, 186 leaves, illustrations, graphicsen_US
dc.publisherBilkent Universityen_US
dc.subjectTop-down nanofabrication techniqueen_US
dc.subjectfiber drawingen_US
dc.subjectthermal instabilityen_US
dc.subjectMie scatteringen_US
dc.subjectcore-shell nanostructuresen_US
dc.subjectnanoshell interferenceen_US
dc.subjectphotonic crystalen_US
dc.subjectsupercontinuum generationen_US
dc.subjectlight trappingen_US
dc.subjectoptical sensoren_US
dc.subject.lccQC176.8.N35 K48 2013en_US
dc.subject.lcshNanostructured materials.en_US
dc.subject.lcshFiber optics.en_US
dc.titleFabrication of novel core-shell nanostructures for photonics applicationsen_US
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