Browsing Electronic Theses and Dissertations by Department "Physics"
Now showing items 61-80 of 200
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(2016-06-30)Department: PhysicsGraphene, the two dimensional allotrope of the carbon family, exhibits extremely high electron mobility, thermal conductivity and fascinating ultrafast carrier-carrier and carrier-phonons interactions. However, being merely ...
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Effects of Geometrical Order on the Linear and Nonlinear Optical Properties of Metal Nanoparticles (2006-09-06)Department: PhysicsThis dissertation describes experimental and computational studies of the effects of ordered arrangement on the linear and nonlinear optical properties of metal nanoparticles. The principal result is that second-harmonic ...
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(2022-03-24)Department: PhysicsVanadium dioxide (VO2) is an exemplary phase-transition material due to its insulator-to-metal transition, which boasts sharp changes in its lattice vectors (~1%), electrical resistivity (~5 orders of magnitude), and optical ...
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(2020-03-24)Department: PhysicsThe E2/M1 mixing ratios have been measured for transitions from states in the one phonon gamma-vibrational bands to states in the ground state bands of of the neutron rich, even-even, deformed isotopes 102,104,106,108Mo, ...
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(2006-12-04)Department: PhysicsIn this dissertation we present our work on developing new beam monitoring methods for linear accelerators and free-electron lasers. Our current work concentrates on the diffraction radiation based beam monitoring technique ...
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Electron Beams from Needle Photocathodes and a New Theory of the Smith-Purcell Free-Electron Laser (2007-02-15)Department: PhysicsA promising source of radiation in the important terahertz (THz) region of the spectrum is the Smith-Purcell free-electron laser (SPFEL). This dissertation presents a new theory of the SPFEL, taking into account dispersion ...
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(2011-03-21)Department: PhysicsThis dissertation presents the study of electron field emission from nanostructures using a first-principles computational framework. Field emission is studied under various conditions such as laser illumination, spin ...
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(2017-09-25)Department: PhysicsNovel nano electronic devices are necessary in order to continue the advancement of computational power of microprocessors in the next decades. On the theory side, it is an open boundary system and usually modeled as a ...
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(2014-04-10)Department: PhysicsBecause most extrasolar planets are detected indirectly via their influence on their host star, processes occurring on the surfaces of these stars are a significant impediment to planet detection: photometric “noise” and ...
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(2012-03-16)Department: PhysicsAs the dimensions in modern integrated circuits (ICs) become smaller, electronic devices become more susceptible to failure due to radiation effects. One type of effect, caused by energy deposition from a single particle ...
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(2016-12-21)Department: PhysicsEngineering light-matter interaction at the nanoscale has the promise to enable technological advances in a wide range of technological applications, including biomolecular sensing, communication, quantum optics, displays, ...
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(2013-07-30)Department: PhysicsIn the first part of this dissertation, I look at (1) the possibility of using a conventional x-ray source for phase-contrast digital tomosynthesis, (2) that the reconstructed tomosynthesis images demonstrate and retain ...
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(2012-04-04)Department: PhysicsWe have observed two erupting, pre-main sequence stars, V1647 Ori and EX Lupi, with the Chandra X-ray Observatory during their 2008 optical eruptions. Our intensive X-ray monitoring of these objects affords the opportunity ...
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(2009-11-09)Department: PhysicsDiffusion-weighted magnetic resonance imaging (DW-MRI) is a noninvasive imaging technique that can be used to quantify the rate of self-diffusion of water molecules. In biological tissues the mobility of water molecules ...
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(2013-12-10)Department: PhysicsThe very-long-term (weeks to years) timing properties of high mass X-ray bina- ries (HMXBs) featuring black holes, particularly the so-called ultraluminous X-ray sources (ULXs), could be linked to the coupled precession ...
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(2009-08-05)Department: PhysicsThe design and characterization of a photovoltaic device employing CdSe nanocrystals sensitized to TiO2 nanotubes is described. The project was divided into three major objectives: (1) fabrication of anodically-oxidized, ...
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(2008-12-05)Department: PhysicsCanonical gravity in real Ashtekar--Barbero variables is generalized by extending Holst's original vacuum analysis to allow for both fermionic and bosonic matter. For fermions, the effects of emerging torsion on parity ...
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(2019-03-28)Department: PhysicsA covariant description of quantum matter fields in the early universe underpins models for the origin of species, e.g. baryogenesis and dark matter production. In nearly all cases the relevant cosmological observables are ...
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(2005-04-19)Department: PhysicsSeveral experiments were performed with a spontaneous fission source of 252Cf with Gammasphere. Triple coincidence gamma-gamma-gamma data were recorded in each of these experiments and analyzed to obtain detailed nuclear ...
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(2017-03-27)Department: PhysicsNeutrinos play a significant role in the Standard Model and the recent discovery of high energy cosmic neutrinos at IceCube has signified the beginning of neutrino astroparticle physics. The cosmic neutrino’s direction and ...