Now showing items 26-45 of 73

    • 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 ...
    • 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 ...
    • 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 ...
    • High speed and high efficiency infrared photodetectors 

      Kimukin, İbrahim (Bilkent University, 2004)
      The increasing demand for telecommunication systems resulted in production of high performance components. Photodetectors are essential components of optoelectronic integrated circuits and fiber optic communication ...
    • Hot electron interactions in nanostructures 

      Kaya, Ismet Inonu (Bilkent University, 1997)
      Modern semiconductor growth and processing techiques have provided the capability of fabricating a huge variety of devices which have atomically precise layered structures and lateral patterns with nanometer sizes. This ...
    • Intracavity optical trapping with fiber laser 

      Kalantarifard, Fatemeh (Bilkent University, 2019-06)
      After Ashkin's seminal works, optical trapping has been a powerful technique for capturing and manipulating sub micro particles not only in physics research fields but also in biology and photonics. Standard optical ...
    • Investigation of lateral forces in dynamic mode using combined AFM/STM 

      Atabak, Mehrdad (Bilkent University, 2007)
      In this Ph.D. work, we constructed a ¯ber optic interferometer based non-contact Atomic Force Microscope (nc-AFM) combined with Scanning Tunneling Micro- scope(STM) to study lateral force interactions on Si(111)-(77) ...
    • Investigation of Si1-xGex alloy formation by using STM 

      Oral, Ahmet (Bilkent University, 1994)
    • 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 ...