Browsing by Subject "Fractal"

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    E-Beam lithography designed substrates for surface enhanced Raman spectroscopy
    (Elsevier BV, 2015-06) Cinel, N. A.; Cakmakyapan, S.; Butun, S.; Ertas, G.; Özbay, Ekmel
    Surface Enhanced Raman Spectroscopy (SERS) is a popular method that amplifies weak Raman signals from Raman-active analyte molecules making use of certain specially-prepared metallic surfaces. The main challenge in SERS is to design and fabricate highly repeatable, predictable, and sensitive substrates. There are many fabrication methods that strive to achieve this goal, which are briefly summarized in this paper. The E-beam lithography method is proposed to be superior to the mentioned techniques. In this paper, we review how EBL can be utilized in the preparation of SERS substrates and we discuss the contributions to the field by the Özbay group.
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    Ferroelectric based fractal phononic crystals: wave propagation and band structure
    (Taylor & Francis, 2020-04) Palaz, S.; Özer, Z.; Mamedov, Amirullah M.; Özbay, Ekmel
    In this study, the band structure and transmission in multiferroic based Sierpinski carpet phononic crystal are investigated based on finite element simulation. In order to obtain the band structure of the phononic crystal (PnC), the Floquet periodicity conditions were applied to the sides of the unit cell. The square lattice PnC consists of various piezoelectric inclusion in a rubber matrix with square and circular cross section.
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    Information flow and interconnections in computing: extensions and applications of Rent's rule
    (Elsevier, 2004) Özaktaş, Haldun M.
    Rent’s rule and related concepts of connectivity such as dimensionality, line-length distributions, and separators are discussed. Generalizations for systems for which the Rent exponent is not constant throughout the interconnection hierarchy are provided. The origin of Rent’s rule is stressed as resulting from the embedding of a high-dimensional information flow graph to two- or three-dimensional physical space. The applicability of these concepts to free-space optically interconnected systems is discussed. The role of Rent’s rule in fundamental studies of different interconnection media, including superconductors and optics, is briefly reviewed.