Now showing items 41-60 of 73

    • Monolithic and hybrid silicon-on-insulator integrated optical devices 

      Kiyat, İsa (Bilkent University, 2005)
      Silicon, the basic material of electronics industry is rediscovered nowadays for its potential use in photonics and integrated optics. The research activity in silicon integrated optics have been speeding up during the ...
    • Nanoscience for sustainable energy production 

      Ataca, Can (Bilkent University, 2011)
      Hydrogen economy towards the utilization of hydrogen as a clean and sustainable energy source has three ingredients. These are (i) hydrogen production; (ii) hydrogen storage; and (iii) fuel cells. Optimization of fuel ...
    • Non-equilibrium steady state phase transitions of various statistical models 

      Renklioğlu, Başak (Bilkent University, 2013)
      Non-equilibrium phase transitions of a number of systems are investigated by several methods. These systems are in contact with thermal baths with different temperatures and taken to be driven to the non-equilibrium ...
    • Nonlinear and far-from-equilibrium dynamics of optical pulses in fiber oscillators 

      Teamir, Tesfay Gebremedhin (Bilkent University, 2017-08)
      Fundamentals of mode locking of lasers have been extensively studied and well established for the last three decades. However, it continues to be an intensely studied field. The continued interest is, in part, due to the ...
    • Novel approaches to control the propagation of electromagnetic waves : metamaterials and photonic crystals 

      Bulu, İrfan (Bilkent University, 2007)
      Applications in areas such as photonics, antennas, imaging and optics require the control of propagation of electromagnetic waves and the control of emission of electromagnetic radiation. Achievements in three key research ...
    • Novel approaches to ultrafast fiber laser design for ablation-cooled material removal 

      Yılmaz, Saniye Sinem (Bilkent University, 2016-11)
      The past few decades in particular have witnessed the tremendous beneficial impact of innovations in laser technology ranging from biomedical to industrial applications in response to enhancing community's quality of life. ...
    • Novel concepts in high power semiconductor lasers 

      Arslan, Seval (Bilkent University, 2018-12)
      This doctoral thesis deals with innovations to the cavity optics of high power semiconductor lasers emitting light at 9xx nm. High power laser diodes are complex electronic and photonic systems. Developments in epitaxial ...
    • 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 ...
    • 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 ...
    • Quantum entanglement and light propagation through Bose-Einstein condensate (BEC) 

      Taşgın, Mehmet Emre (Bilkent University, 2009)
      We investigate the optical response of coherent media, a Bose-Einstein condensate (BEC), to intense laser pump stimulations and weak probe pulse propagation. First, we adopt the coherence in sequential superradiance ...
    • Quantum gases in rotating optical lattices 

      Umucalılar, Rifat Onur (Bilkent University, 2010)
      The thesis is structured into two main parts so as to cover bosons and fermions in rotating optical lattices separately. In the first part, after a brief introduction to ultracold atoms in optical lattices, we review the ...
    • Quantum Monte Carlo simulations of ultracold atomic systems 

      Akatürk, Emre (Bilkent University, 2019-07)
      Here, we present our work and findings on ultracold atomic systems. We first present a semi-analytical work on density wave instability (DWI) and collective modes of a bilayer dipolar system of bosons and fermions. We ...
    • Quantum statistics of light interacting with matter 

      Müstecaplıoğlu, ÖE (Bilkent University, 1999)
      Studies on some systems in which light interacts with matter are performed from quantum statistical point of view. As a result of these studies a novel effect which can be utilized for detecting squeezed phonons is ...
    • Robust entanglement in atomic systems 

      Çakır, Özgür (Bilkent University, 2005)
      Various models for generation of robust atomic entangled states and their implementation with current accessible technologies are proposed and worked out. Deterministic creation of long living Bell states with respect ...