Işığın çift katmanlı nano yapılardan saçılımı: Yapısal renklenme

In this work, we produced kilometer-long semiconducting cylindrical nanostructures by using a top-to-bottom nanofabrication technique which was recently developed in our research group. Comparison of commonly used methods for producing nanostructures such as electrospinning and nanoimprint lithography versus iterative thermal size reduction (ISR), is done in terms of uniformity, geometry control, multi-material compatibility, yield and device integrability. While the others cannot fulfil all requirements, ISR shows impressive results in all aspects. From very beginning to end, all steps of production and characterization of nanowires produced by ISR, the design, chalcogenide glass production, preform preparation, fiber drawing, iterative size reduction, chemical etching and imaging are explained in details. In addition, production of nanospheres by using in-fiber fluid instability which is based on Plateau-Rayleigh instability is also demonstrated. Theoretical study on scattering from small particles, Mie scattering, which is one of the mechanism for structural coloration together with thin film interference, multilayer interference, diffraction grating and photonic crystals is done. Structural coloration due to scattering from small particles is simulated by using Finite Domain Time Difference (FDTD) method and compared with theoretical results estimated for nanowire and nanosphere cases. Results are confirmed with experimental observation of structural coloration by taking dark field optical microscopy images of the final products of ISR and in-fiber fluid instability processes. Keywords: Nanotechnology, Fiber drawing, Nanostructures, Structural coloration, Mie scattering.