Browsing Dept. of Physics - Master's degree by Title
Now showing items 113-132 of 170
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Pairing in charged-neutral fermion mixtures under an artificial magnetic field
(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
(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
(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
(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
(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
(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
(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
(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 ... -
Plasmonic metamaterial based structures for designing of multiband and thermally tunable light absorbers, multiple thermal infrared emitter, and high-contrast asymmetric transmission optical diode
(Bilkent University, 2021-07)Metamaterials with sub-wavelength nanostructures refer to a class of synthetic materials that possess exotic electromagnetic properties which cannot be observed with natural materials. Negative refractive index, asymmetric ... -
Plasmonic nanoparticles by laser dewetting of thin metallic films
(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
(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
(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 ... -
Prediction and characterisation of intensity noise of ultrafast fiber amplifiers and low noise vibrometer for biological applications
(Bilkent University, 2013)We report on the experimental characterisation and theoretical prediction of intensity fluctuations for ultrafast fibre amplifiers. We formulate a theoretical model with which the intensity noise of a Yb-doped fiber ... -
Probing interfacial processes on carbon nanotubes and graphene surfaces
(Bilkent University, 2012)The surface of low-dimensional carbon (carbon nanotubes and graphene) has unique electronic properties due to the delocalized p-orbitals. Very high carrier mobility with nanoscale dimension make carbon nanotubes and ... -
Quantum polarization properties of radiation
(Bilkent University, 1999)New bosonic operators, describing the polarization properties of photons at any point with respect to a source, are introduced. It is shown that, unlike the classical picture, the local quantum description of polarization ... -
Quantum properties of multipole radiation
(Bilkent University, 2002)In this study, multipole expansion of quantum electromagnetic radiation is constructed and quantized by canonical transformation with increasing demand of some modern research areas of physics such as entanglement of the ... -
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 ...
