Production and characterization of multilayered one dimensional plasmonic nanowires

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Tezin Türü: Yüksek Lisans

Tezin Yürütüldüğü Kurum: Orta Doğu Teknik Üniversitesi, Fen Edebiyat Fakültesi, Fizik Bölümü, Türkiye

Tezin Onay Tarihi: 2017

Öğrenci: EZGİ AYGÜN

Eş Danışman: HÜSNÜ EMRAH ÜNALAN, ALPAN BEK

Özet:

In this study, the main objective is to obtain enhanced optical properties from low dimensional nanostructures via tailoring their plasmonic properties. As the low dimensional multilayered plasmonic structures bear hybrid plasmon modes due to plasmon mixing, some of these modes are found to be subject to very low attenuation, resulting in long range and long lifetime plasmons. Such nanostructures have the potential to be utilized as efficient light management interfaces in thin film photovoltaic devices or as low-loss interconnects in integrated photonic circuitry. For this purpose, a novel geometry was designed composed of one dimensional (1D) metal/dielectric multilayers. Scattering spectra of multilayered nanostructures depend strongly on the thicknesses of the layers. Atomic layer deposition (ALD) technique was used to deposit thin titanium dioxide (TiO2) spacer layers on high aspect ratio polyol synthesized core silver nanowires. The ALD process was optimized by investigating the compositional, morphological, optical, and electrical properties of the deposited thin films using various characterization techniques. A thin layer of silver on top of TiO2 coated silver nanowires serves as a coaxial outer layer facilitating plasmon hybridization. The optical characterization of the resultant nanowires indicates that the plasmonic response of 1D coaxial nanowires of metaldielectric-metal multilayers can be tuned by tailoring the constituent layers. In this study, we showed that it is possible to generate new hybridized plasmon modes in 1D multilayered nanowires.