Now showing items 146-165 of 225

    • On the strain in silicon nanocrystals 

      Yılmaz, Dündar (Bilkent University, 2009)
      In this Thesis we present our achievements towards an understanding of atomistic strain mechanisms and interface chemistry in silicon nanocrystals. The structural control of silicon nanocrystals embedded in amorphous ...
    • Optical and thermal dynamics of long wave quantum cascade lasers 

      Gündoğdu, Sinan (Bilkent University, 2018-09)
      Quantum Cascade Lasers (QCLs) are coherent light sources that make use of intraband transitions of wavefunction engineered semiconductor quantum wells. They have been designed to emit light in a wide spectral range; from ...
    • Optical near field interaction of spherical quantum dots 

      Amirahmadov, Togay (Bilkent University, 2012)
      Nanometer-sized materials can be used to make advanced photonic devices. However, as far as the conventional far-field light is concerned, the size of these photonic devices cannot be reduced beyond the diffraction limit ...
    • Pairing in charged-neutral fermion mixtures under an artificial magnetic field 

      Ünal, Fatma Nur (Bilkent University, 2012)
      Bose-Einstein condensations (BEC), pairing behaviour, vortex formations in superconductivity and superfluidity are just a few examples of fascinating features of ultracold gases. In this thesis, we study charged-neutral ...
    • Passivation of InSb infrared photodetectors 

      Yumrukçu, Samed (Bilkent University, 2010)
      Infrared detectors have wide range applications in both military and civilian life. One of the most commonly used infrared detectors is InSb detectors. InSb detector technology has been developing since 1950s. Fabricating ...
    • Persistent currents in carbon nanotubes 

      Çetiner, Sinem Binicioğlu (Bilkent University, 2003)
      Carbon nanotubes are one of the most important findings of physics in the recent years. They are of great interest because of their various electrical, and mechanical features. All the properties of the nanotubes are ...
    • Phase transitions in tetrahedral Ising lattices 

      Kabakçıoğlu, Alkan (Bilkent University, 1993)
      After a review of the Renormalization CJroup theory, the phase diagram of unisotro])ic tetrahedral Ising lattice is explored l)y the motivation gained through the recent experimental findings about SiGe alloys. ...
    • Phonon anomalies in high temperature superconductors 

      Türeci, E Hakan (Bilkent University, 1996)
      Anomalously large low temperature phonon anharmonicities can lead to static as well as dynamical changes in the low temperature properties of the vibrational system. In this work, we focus our attention on the low ...
    • Phonon renormalization effects in low dimensional electron-hole systems 

      Güven, Kaan (Bilkent University, 1995)
      Ia)vv (linuMisioiial sciniromluclor st i iid iii4's lia\4‘ 1и‘(М1 an (‘Xt(Misiv(‘ i4\soa,rrh iwcix ill (4)iul(4iscd iiiatlcr physics. In j^aii iculai', iiindi (‘llorl has 1)(Ч'п dcvolnd to lhc‘ study ol ciuasi-one-diiiK'iisional ...
    • Phonon-coupling and magnetic fields effects on the binding energy of a hydrogenic impurity in two dimensions 

      Kop, Bahar (Bilkent University, 2006)
      Electron-phonon interaction and ınagne t ic field effects on a two-dimensional electran bound to a Coulomb center is st udied within the fraınework of a variational appıoxinıat ion consisting of an adiabatic polaronic wave ...
    • Photocatalytic nanocomposites for increased optical activity 

      Tek, Sümeyra (Bilkent University, 2008)
      To combat environmental pollution, photocatalytic decomposition provides degradation of organic and inorganic contaminants near the surface of the photocatalyst nanoparticles by converting optical energy of the absorbed ...
    • Physics and applications of coupled-cavity structures in photonic crystals 

      Bayındır, Mehmet (Bilkent University, 2002)
      We proposed and demonstrated a new type of propagation mechanism for the electromagnetic waves in photonic band gap materials. Photons propagate through coupled cavities due to interaction between the highly localized ...
    • Physics and applications of photonic crystals 

      Temelkuran, Burak (Bilkent University, 2000)
      We first fabricated a dielectric based layer-by-layer photonic crystal, with a three-dimensional photonic band gap at microwave frequencies. We investigated the transmission, reflection and defect characteristics of the ...
    • Physics of nonradiative energy transfer in the complex media of 0D, 2D and 3D materials 

      Yeltik, Aydan (Bilkent University, 2016-08)
      Quantum-confined colloidal nanostructures with strong excitonic properties have emerged as promising light harvesting components in photonics and optoelectronics over the past 20 years. With their favorable photophysical ...
    • Plasmonic band gap cavities 

      Kocabaş, Aşkın (Bilkent University, 2008)
      Surface plasmon polaritons (SPP’s) are trapped electromagnetic waves coupled to free electrons in metals that propagate at the metal-dielectric interfaces. Due to their surface confinement and potential in sub-wavelength ...
    • Plasmonic nanoantennas for enhanced light-matter interactions and graphene based tunable nanophotonic devices 

      Çakmakyapan, Semih (Bilkent University, 2015)
      Focusing, manipulating and beaming of electromagnetic waves are important for many applications such as antennas, optical isolators, biological sensor, chemical sensors, and solar cells. There is an extensive research ...
    • Plasmonic nanoparticles by laser dewetting of thin metallic films 

      Sarıtaş, Seval (Bilkent University, 2013)
      In this work, formation of metal nanoparticles via laser induced dewetting and their plasmonic properties have been investigated. The effects of metal film, substrate type, laser power density and dwell time on dewetting ...
    • Plasmonics from metal nanoparticles for solar cell applications 

      Günendi, Mehmet Can (Bilkent University, 2013)
      In today’s economy, need for development in energy is essential. Solar energy is safe, and at the same time is one of the cleanest, cheapest choices of energy alternative to fossil fuels. In this perspective, using the ...
    • Polarization independent thermo-optic modulators for integrated optics 

      Kocabaş, Aşkın (Bilkent University, 2003)
      In this work, we studied MMI and Y-junction based Mach-Zehnder modulators on both silicon-on-insulator and polymer based on thermo-optic effect. Both Pπ values and frequency response of the devices were measured and ...