Browsing Dept. of Physics - Ph.D. / Sc.D. by Title
Now showing items 32-51 of 73
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Intracavity optical trapping with fiber laser
(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
(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
(Bilkent University, 1994) -
The left hand of electromagnetism : metamaterials
(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
(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
(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
(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
(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
(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
(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
(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
(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
(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
(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
(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
(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
(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
(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 ... -
Phonon-mediated electron-electron interaction in confined media: low-dimensional bipolarons
(Bilkent University, 2000) -
Physics and applications of coupled-cavity structures in photonic crystals
(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 ...
