Now showing items 67-86 of 233

    • First-principles investigation of functionalization of graphene 

      Korkmaz, Yaprak (Bilkent University, 2013)
      The graphene sheet is a single-atom thick novel material and attracts great interest due to its unique features. However, it is a metallic material with no bandgap, which makes it difficult to integrate in electronic ...
    • First-principles investigation of graphitic nanostructures 

      Şen, Hüseyin Şener (Bilkent University, 2013)
      In this thesis, first-principles investigations of several graphene related nanosystems based on density functional theory are presented. First, the electronic structure of several graphene nano-ribbons both in 1D and ...
    • Formation of Ge nanocrystals with CW laser irradiation of Siox:Ge thin films 

      Gümüş, Melike (Bilkent University, 2015)
      Germanium and silicon are the materials which have effective absorption in the visible and near infrared region of electromagnetic spectrum; therefore they are preferred for optoelectronic device and solar cell applications. ...
    • Formation of silicon nanocrystals by laser processing of silicon rich oxides 

      Gündoğdu, Sinan (Bilkent University, 2012)
      Silicon nanocrystals are well known to exhibit strong luminescence in the visible. Extension of this into a nanocrystal network would be beneficial for many applications. In the light of recent advances on exciton-plasmon ...
    • Frictional properties of quasi-two-dimensional materials from the Prandtl-Tomlinson model 

      Adeel, Shaharyar (Bilkent University, 2016-10)
      Tribology, the study of friction, is both an old theoretical problem in physics and an area of great practical importance. The invention of experimental instruments such as Atomic Force Microscope (AFM) has lead to the ...
    • Functionalization of carbon nanotubes 

      Dağ, Sefa (Bilkent University, 2005)
    • GaAs/AlGaAs polarization splitting directional couplers 

      Yurt, Nasuhi (Bilkent University, 1997)
      Directional couplers are building blocks for m any guided wave devices in integrated optics and optoelectronics. They have been used as switches, modulators, wavelength filters, power dividers, wavelength m ultiplexer-dem ...
    • Gain measurements via spontaneous emission in quantum well semiconductor lasers 

      Azfar, Talal (Bilkent University, 1996)
      111 this work ail analysis of gain in single c|iianliini well last'rs as a riinction of sonu' of llu'ir o|)(M’alioiial paranu'l('rs is earrii'd oiil. I^'irsl, a 1 li('or('liea.l inodi'l of gain is |)resent('d. 'riuMi two ...
    • GaN/AlGaN-based UV photodetectors with performances exceeding the PMTS 

      Tut, Turgut (Bilkent University, 2008)
      The recent developments in high Al-content AlxGa1−xN material growth technology made it possible to fabricate high performance solar-blind photodetectors operating in the ultraviolet (UV) spectral region with improved receiver ...
    • Germanium alloys for optoelectronic devices 

      Erbil, Ayşe (Bilkent University, 2008)
      Silicon has been the backbone of the mainstream electronics of the last fifty years. It is however, used in conjunction with other matierals, mainly with its oxides and nitrides. Germanium, on the other hand, is also a ...
    • Graphene based high frequency electronics 

      Pinçe, Erçağ (Bilkent University, 2010)
      Recent advances in chemical vapor deposition of graphene on large area substrates stimulate a significant research effort in order to search for new applications of graphene in the field of unusual electronics such as ...
    • Graphene based optoelectronics in the visible spectrum 

      Polat, Emre Ozan (Bilkent University, 2015)
      Graphene, a two dimensional crystal of carbon atoms, emerges as a viable material for optoelectronics because of its electrically-tunable broadband optical properties. Optical response of graphene at visible and near ...
    • Graphene-based electrically tunable terahertz optoelectronics 

      Kakenov, Nurbek (Bilkent University, 2016-11)
      Advances in terahertz (THz) research and technology, has bridged the gap between radio-frequency electronics and optics. More efficient control of THz waves would highly benefit noninvasive, high-resolution imaging ...
    • Grating based plasmonic cavities 

      Şenlik, Servet Seçkin (Bilkent University, 2009)
      Surface plasmon polaritons are dipole carrying electromagnetic excitations occur- ing at metal-dielectric interfaces. Metallic periodic structures exhibit modi¯ed transmission and re°ection spectra owing to the interaction ...
    • Grating loaded integrated optical cantilevers 

      Karademir, Ertuğrul (Bilkent University, 2010)
      Cantilever beams are the most important parts of standard scanning probe microscopy. In this work, an integrated optical approach to sense the deflection of a cantilever beam is suggested and realized. A grating coupler ...
    • Gravitational waves from binary black hole systems in inspiralling phase 

      Kökcü, Efekan (Bilkent University, 2018-07)
      Binary black hole systems have three phases: inspiralling, merger and ringdown phases. This thesis is a review of methods developed to study the inspiralling phase analytically. Those methods include post Minkowskian ...
    • Ground state energy of the fröhlich polaron as a function of dimensionality and the phonon coupling strength 

      Bayrak, Hamdi Burak (Bilkent University, 2018-09)
      We use the trial polaron wave function introduced by Devreese et al. [1] to estimate the ground state energies of the Fröhlich polaron over a broad range of the phonon coupling strength by a variational approach. We ...
    • Ground-state properties of double-wire semiconducting systems 

      Mutluay Müstecaplıoğlu, Nihal (Bilkent University, 1997)
      With the recent advances in nanometer-scale semiconductor device fabrication technology, it became experimentally possible to produce strongly confined electron systems. Quantum wires are among these systems, and are ...
    • Ground-state properties of ultra-cold atomic gases 

      Sevinçli, Sevilay (Bilkent University, 2008)
      After the observation of Bose-Einstein condensation, the developments in the experimental control and measurement methods provided the realization of basic models of many-body physics using dilute, ultra-cold gases. This ...
    • The growth, fabrication and characterization of high performance AI(formula)Ga(formula)N metal-semiconductor-metal photodiodes 

      Bütün, Serkan (Bilkent University, 2006)
      High performance UV photodetectors have attracted unwarranted attention for various applications, such as in military, telecommunication, and biological imaging, as an AlxGa1-xN material system is also rather suitable ...