Now showing items 194-213 of 233

    • Silicon-on-insulator optical waveguides and waveguide devices 

      Kiyat, İsa (Bilkent University, 2000)
      Silicon-on-insulator(SOI) optical waveguides, directional couplers and some types of MMI couplers were designed, fabricated and characterized at a wavelength of 1.55 /im. Effective index method and the single mode ...
    • Size controlled germanium nanocrystals in dielectrics : structural and optical analysis and stress evolution 

      Bahariqushchi, Rahim (Bilkent University, 2017-09)
      Group IV semiconductor nanocrystals, namely silicon and germanium have attracted much interest in the past two decades due to their broad applications in photovoltaic, memory, optoelectronic, medical imaging and ...
    • Slow light in Germanium nanocrystals 

      Keleş, Ümit (Bilkent University, 2009)
      The phenomena of quantum coherence has been applied with great success in the atomic systems. For optoelectronic applications the interest is inherently directed towards the semiconductor heterostructures. Large number ...
    • Sonic Hawking Radiation from a blackhole laser 

      Ouf, Ahmed Refat Mohamed Mohamed (Bilkent University, 2018-06)
      The quantum thermal radiation from a black hole (BH) known as “Hawking Radiation” or “Black Hole Evaporation” results from studying quantum fields in the curved space-time of the horizon of a BH. Experimentally, the ...
    • Sorting of chiral microswmmers 

      Mijalkov, Mite (Bilkent University, 2014)
      Microscopic swimmers, for example chemotactic bacteria and cells, are capable of directed motion by exerting a force on their environment. In some cases, including bacteria and spermatozoa swimming near boundaries, or ...
    • Spatial properties of quantum multipole radiation 

      Can, Muhammet Ali (Bilkent University, 2000)
      Complete quantum mechanical treatment of multipole radiation is constructed. Vacuum noise of polarization for transversally and longitudirudly polcirized fields is discussed for different total angular momentum values ...
    • Spintronic properties of carbon and silicon based nanostructures 

      Durgun, Engin (Bilkent University, 2007)
      In this thesis, nanostructures which may display novel spintronic behaviors are revealed and their properties are investigated by using first-principles methods. We have concentrated on three different systems, namely ...
    • Stability of two dimensional (2D) structures based on GaAs 

      Erol, Mustafa (Bilkent University, 2015-08)
      Graphene is a two dimensional material isolated for the first time in 2004. After this, two dimensional materials has become an appealing research area for the scientists because of their exotic properties. In search ...
    • Strained empirical pseudopotential generation from hybrid density functionals: GaAs, InAs,GaSb, InSb 

      Çakan, Aslı (Bilkent University, 2015-08)
      Self-assembled quantum dots composed of III-V compounds receive considerable attention due to their potential applications on spintronics and quantum informa- tion processing. Here, lattice mismatch between two materials ...
    • Strongly correlated models of high-temperature superconductivity 

      Boyacı, Hüseyin (Bilkent University, 1999)
      Son zamanlarda nanometrc büyüklüğündeki örneklerle ya|)dan tek ek'ktron ta.^ınma deneyleri, üstün iletkenlerin büyüklüklerinin alt sının ile ilgili soruyu yeniden gündeme getirmiştir, iler ne kadar, belirsiz tanecik ...
    • Strongly interacting one-dimensional Bose condensates 

      Erkan, Kamil (Bilkent University, 2000)
      Recent observation of Bose-Einstein condensation in dilute alkali gzises led to a great interest in this area both experimentally and theoretically. The most important characteristics of a Bose-Einstein condensate is ...
    • Structural and electronic properties of carbon-based materials 

      Kılıç, Çetin (Bilkent University, 2000)
      In this thesis, some carbon-based materials in nano scale have been investigated by using first-principles methods as well as transferable tight-binding and empirical potential models. The focus of interest has been in ...
    • A study of adsorption of single atoms on carbon nanotubes 

      Durgun, Engin (Bilkent University, 2003)
      The adsorption of individual atoms on the semiconducting and metallic singlewall carbon nanotubes (SWNT) have been investigated by using first-principles pseudopotential plane wave method within Density Functional Theory. ...
    • Study of anisotropic particles in active bath 

      Mehmood, Naveed (Bilkent University, 2015)
      Brownian (passive) particles undergo random motion due to thermal agitation in the surrounding medium. In recent years, a lot of attention has been devoted to study active Brownian particles, i.e., microscopic particles ...
    • Sub-wavelength resolution in a photonic crystal superlens 

      Çubukçu, Ertuğrul (Bilkent University, 2003)
      Materials that can bend light in the opposite direction to normal (’left-handed’ materials) reverse the way in which refraction usually works-this negative refractive index is due to simultaneously negative permeability ...
    • Subwavelength surface plasmon interferometer for high-throughput sensing 

      Yavaş, Özlem (Bilkent University, 2012)
      Small detection volume, increased analysis speed and reduced cost are the main driving forces for miniaturized lab-on-a-chip systems. Subwavelength holes on opaque metal films provide a unique configuration for miniaturized ...
    • Superconducting systems of low dimensionality 

      Gedik, M. Zafer (Bilkent University, 1992)
      It is possible to call the last five years as the golden age of superconductivity. The two most important developments in the field are the discovery of copper oxide and fullerene superconductors. In this work, some ...
    • Superconductivity in ultrasmall metallic grains 

      Bozat, Özgür (Bilkent University, 2001)
    • Supercurrents and persistent currents in strongly correlated electron systems 

      Boyacı, Hüseyin (Bilkent University, 1995)
      The lull understanding· ol’the solution Гог the 1-tl Hubbard model is of interest in its own right, and may provide clues to the understanding of higher dimensioned systiMiis. We have found tin? exact solution of tlie ...
    • Surface plasmon based enhanced transmission of electromagnetic waves 

      Bıyıklı, Süheyla Sena Akarca (Bilkent University, 2004)
      Grating-coupling phenomena between surface plasmons and electromagnetic waves are studied in the microwave spectrum using metallic gratings. Transmission and reflection measurements were carried out to observe the transmitted ...