Browsing Theses - Department of Physics by Title
Now showing items 176-195 of 229
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Rabi oscillations in an exciton-polariton system
(Bilkent University, 1995)The pure qiiaiitum model d(\scril)ing lîahi oscillations of exciton-polaritons in a ınicro-cavity is consid(‘r(‘(l. IMiolon-c'Xcilon intiT’action Hamiltonian is diagonalized with the aid of Bogoliihov canonical transformations ... -
Radiation properties of sources inside photonic crystals
(Bilkent University, 2003)The control of spontaneous emission is an important problem both in basic and applied physics. Two main problems arise in the control of emission: enhancement or suppression and angular confinement of radiation. In this ... -
Refractive index tuning with Burstein-Moss effect in Indium Nitrite under photoexcitation
(Bilkent University, 2009)The band filling effect due to free carriers introduces a shift in the absorption edge, which in turn modifies the refractive index of the medium through the Kramers-Kronig relation. This is known as the Burstein-Moss ... -
Repetition-rate stabilization of femtosecond stretched-spectrum fiber laser
(Bilkent University, 2008)Passively modelocked lasers produce trains of femtosecond pulses, with the temporal separation between the pulses being determined by the length of the laser cavity. The repetition rate of the laser is inverse of this ... -
Ridge waveguide GaAS
(Bilkent University, 1994)The study of solid-state laser structures in low dimensions has gained great deal of attention in recent years. The theory originated in early 1960s developed really fast along with new fabrication methods bringing ... -
Robust entanglement in atomic systems
(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 ... -
Rotating two leg Bose Hubbard ladder
(Bilkent University, 2009)We analyze two leg Bose Hubbard model under uniform magnetic field within various methods. Before studying the model, we discuss the background on rotating Bose Einstein condensates, Bose Hubbard model and superfluid ... -
Scanning hall probe microscopy (SHPM) using quartz crystal AFM feedback
(Bilkent University, 2005)Scanning Hall Probe Microscopy (SHPM) is a quantitative and non-invasive technique for imaging localized surface magnetic field fluctuations such as ferromagnetic domains with high spatial and magnetic field resolution ... -
Selective plasmonic control of excitons and their non-radiative energy transfer in colloidal semiconductor quantum dot solids
(Bilkent University, 2009)To date extensive research has proved that semiconductors and metals exhibit extraordinary optical properties in nano-dimensions compared to their bulk counterparts. For example, an interesting effect is observed in ... -
Silicon and carbon based nanowires
(Bilkent University, 2004)Nanowires have been an active field of study since last decade. The reduced dimensionality end size allowing electrons can propagate only in one direction has led to quantization which are rather different from the bulk ... -
Silicon based dielectrics : growth, characterization, and applications in integrated optics
(Bilkent University, 2005)In recent years, growing attention has been paid to silicon based dielectrics, such as silicon oxynitrides, silicon nitrides, and semiconductor doped silicon oxides, all combined under the name silica on silicon technology. ... -
Silicon nanocrystal doped polymer nanowire arrays
(Bilkent University, 2013) -
Silicon nanowire-based complex structures : A Large-scale atomistic electronic structure and ballistic transport
(Bilkent University, 2014)While the hierarchical assembling as well as the dramatic miniaturization of Si nanowires (NWs) are on-going, an understanding of the underlying physics is of great importance to enable custom design of nanostructures ... -
Silicon oxynitride layers for applications in optical waveguides
(Bilkent University, 2000) -
Silicon-on-insulator optical waveguides and waveguide devices
(Bilkent University, 2000)Silicon-on-insulator(SOI) optical waveguides, directional couplers and some types of MMI couplers were designed, fabricated and characterized at a wavelength of 1.55 /im. Effective index method and the single mode ... -
Size controlled germanium nanocrystals in dielectrics : structural and optical analysis and stress evolution
(Bilkent University, 2017-09)Group IV semiconductor nanocrystals, namely silicon and germanium have attracted much interest in the past two decades due to their broad applications in photovoltaic, memory, optoelectronic, medical imaging and ... -
Slow light in Germanium nanocrystals
(Bilkent University, 2009)The phenomena of quantum coherence has been applied with great success in the atomic systems. For optoelectronic applications the interest is inherently directed towards the semiconductor heterostructures. Large number ... -
Sonic Hawking Radiation from a blackhole laser
(Bilkent University, 2018-06)The quantum thermal radiation from a black hole (BH) known as “Hawking Radiation” or “Black Hole Evaporation” results from studying quantum fields in the curved space-time of the horizon of a BH. Experimentally, the ... -
Sorting of chiral microswmmers
(Bilkent University, 2014)Microscopic swimmers, for example chemotactic bacteria and cells, are capable of directed motion by exerting a force on their environment. In some cases, including bacteria and spermatozoa swimming near boundaries, or ... -
Spatial properties of quantum multipole radiation
(Bilkent University, 2000)Complete quantum mechanical treatment of multipole radiation is constructed. Vacuum noise of polarization for transversally and longitudirudly polcirized fields is discussed for different total angular momentum values ...
