Now showing items 35-54 of 72

    • The left hand of electromagnetism : metamaterials 

      Alıcı, Kamil Boratay (Bilkent University, 2010)
      Metamaterials are artificial periodic structures whose electromagnetic response is solely dependent on the constituting unit cells. In the present thesis, we studied unit cell characteristics of metamaterials that has ...
    • Light matter interaction in plexcitonic crystals and moiré cavities 

      Karademir, Ertuğrul (Bilkent University, 2015-01)
      Surface plasmon polaritons (SPPs) are quanta of electromagnetic excitations at the interface between metal and dielectric media. SPPs with an evanescent tail in the perpendicular direction, thus their properties are ...
    • Manipulation and control of collective behavior in active matter systems 

      Pinçe, Erçağ (Bilkent University, 2016-11)
      Active matter systems consist of active constituents that transform energy into directed motion in a non-equilibrium setting. The interaction of active agents with each other and with their environment results in collective ...
    • Many-body effects in selected two-dimensional systems 

      Subaşı, A. Levent (Bilkent University, 2009)
      In this thesis we study many-body effects in three distinct two-dimensional systems. The two dimensional electron gas is a model system yielding to basic analytical and computational theoretical ideas of many-body physics ...
    • Many-body interaction effects in quasi-one-dimensional photo-excited electron-hole systems 

      Güven, Kaan (Bilkent University, 1999)
      The work in this thesis concerns rnany-body interaction effects in a quasi-onedimensional electron-hole plasma, which may be generated under intense photoexcitation in a semiconductor quantum-well wire. In particular, ...
    • Mixtures of charged-neutral superfluids 

      Ünal, Fatmanur (Bilkent University, 2016-12)
      Motivated by the developments of artificial magnetic fields (AMFs) enabling cou- pling to the neutral particles of ultracold quantum gases, we have theoretically studied charged-neutral mixtures in various settings. The ...
    • 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 ...