Scopus İndeksli Yayınlar Koleksiyonu
Permanent URI for this collectionhttps://hdl.handle.net/20.500.12573/395
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Article Use of Confocal Microscopy to Monitor Structural Transformations in Nanopillars Based on DNA and CdSe/CdZnSe Quantum Dots(Springer, 2023-06-24) Motevich, I. G.; Erdem, T.; Akrema, A.; Maskevich, S. A.; Strekal, N. D.Chip system prototypes in the form of nanopillars were created from DNA complexes with CdSe/CdZnSe/ZnS quantum dots immobilized on a plasmonic gold fi lm by the use of vacuum deposition technology and inorganic synthesis. The design and presence of terminal DNA labeled with Cy3 cyanine dyes makes it possible to carry out the hybridization reaction of this terminal strand with complementary DNA and to control the process by variation of the giant Raman scattering (GRS) and the fluorescence signal. The effect of molecular recognition of complementary DNA is accompanied by a change in the GRS spectrum, a 20-fold increase in the fluorescence intensity, and a decrease in the duration of fluorescence decay.Article Broadband Low Reflection Surfaces With Silicon Nanopillar Hexagonal Arrays for Energy Harvesting in Photovoltaics(Springer, 2022-06-25) Tut, TurgutIn this study, optimization of the silicon nanopillar arrays and thin films coated on silicon substrate has been investigated in order to minimize the optical reflection loss from the silicon substrate surface. Nanopillars's filling ratio, pillar height, pillars diameter, sidewall incline angle, and step coverage with dielectric thin film thickness are systematically optimized together for the first time with these type of nanostructures. Full-field Finite Difference Time Domain method is used to simulate electro-magnetic fields and calculate the reflection from the modified nanostructured substrate surfaces in 400-1100 nm spectral range. Optimization recipe is clearly presented and this is not only useful for hexagonal arrays but also for regular arrays of nanopillars in general. We also further decrease the reflection by using step coverage concept which is the result of nonconformal coating on steps and trenches of thin films. We obtained approximately 2% of weighted average reflection in the 400-1100 nm range for perpendicular incident solar radiation which is one of the best results reported for this type of nanostructured surfaces in the literature.