Physics (Theses and Dissertations): Recent submissions
Now showing items 201-220 of 458
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Solution processed Group V1 transition metal dichalcogenides : a study on conductive hybrids and photoconductivity for future applications in printed electronics
(Trinity College (Dublin, Ireland). School of Physics, 2014)Transition metal dichalcogenides (TMDs) constitute a class of inorganic layered compound with generalised MX2 stoichiometry, where M denotes a transition metal atom and X a chalcogen atom of sulfur, selenium or tellurium ... -
An investigation into the effects of magnetic fields on biological cell processes
(Trinity College (Dublin, Ireland). School of Physics, 2011)The application of external magnetic fields to biological cells has received the attention of many researchers in recent decades and there have been countless reports of effects on a myriad of cellular processes. Despite ... -
Electronic structure, bonding and dichroism in rutile compounds : an X-ray spectroscopic study
(Trinity College (Dublin, Ireland). School of Physics, 2012)Rutile-type transition-metal compounds are a continually rewarding area of research, of both technological and fundamental importance due to their exhibiting a wide variety of physical properties, lending to numerous ... -
Solution phase silver nanostructures for ehanced localized surface plasmonic sensing
(Trinity College (Dublin, Ireland). School of Physics, 2010)A detailed study of the Localized Surface Plasmon Resonances (LSPR) of a range of solution phase silver nanostructure sols and their refractive index sensitivity is presented. This work focuses on developing a thorough ... -
Electronic structure study of defects and impurities in oxide semiconductors
(Trinity College (Dublin, Ireland). School of Physics, 2012)In this work, the crystal and electronic structures of defects and impurities in ZnO and Fe3O4 are studied using first principles calculations. B3LYP hybrid density-functional theory calculations were used with supercell ... -
Spin-dependent transport in multifunctional tunnel junctions
(Trinity College (Dublin, Ireland). School of Physics, 2012)Spin-dependent tunnelling between ferromagnetic electrodes separated by insulating oxide barriers has long attracted scientific and commercial interest. In the last decade it became evident that the insulating layer was ... -
Magnetic barcodes in molecular medicine
(Trinity College (Dublin, Ireland). School of Physics, 2010)The need for faster and more sensitive diagnostic systems for the early detection of many life-threatening diseases is the driving force behind the work in this thesis. A lab-on-a-chip prototype device incorporating a ... -
An experimental investigation of tunable laser diodes based on multiple etched slots
(Trinity College (Dublin, Ireland). School of Physics, 2010)Widely tunable semiconductor lasers will play a critical part in future technologies. Tunable lasers are rapidly replacing fixed wavelength lasers in dense wavelength division multiplexing (DWDM) optical communications. ... -
Electronic transport and magnetic properties of organic semiconductors
(Trinity College (Dublin, Ireland). School of Physics, 2011)The primary aim of this research thesis is to investigate the electronic transport and magnetic properties of organic semiconducting materials. Undeniably, experimental and theoretical work is needed to conclusively study ... -
Investigation of transport through interfacial barriers between metals and semiconductors
(Trinity College (Dublin, Ireland). School of Physics, 2009)Electrical spin injection from a ferromagnetic metal source into a semiconductor can only take place through an interfacial barrier (Rashba, Phys. Rev. B 62, R16267 and Phys. Rev. B 68, 241310). This thesis presents a study ... -
Towards stable molecular nanostructures on a semiconductor surface
(Trinity College (Dublin, Ireland). School of Physics, 2012)The miniaturisation trend in the construction of electronic devices has recently sparked an interest in the bottom-up construction of 2-dimensional nanostructures from single organic molecular building blocks on surfaces. ... -
Computational studies of correlated 1D and 3D systems : a density functional theory approach
(Trinity College (Dublin, Ireland). School of Physics, 2011)This thesis describes a number of theoretical investigations into the electric and magnetic properties of one-dimensional and three-dimensional correlated systems. Our studies are based on suitable and efficient implementations ... -
Novel transparent conducting oxides for application in solar cells
(Trinity College (Dublin, Ireland). School of Physics, 2012)In the present thesis deposition and characterization of transparent conducting oxides (TCOs) have been explored. The coexistence of transparency and conductivity in a material is often regarded as an unusual property, ... -
An X-ray search for active cores in Local Group galaxies
(Trinity College (Dublin, Ireland). School of Physics, 2000)The nuclei of galaxies are sometimes sites of very energetic process, resulting in high levels of electromagnetic radiation being emitted. Such active galactic nuclei (AGNs) are thought to be powered by accretion of mass ... -
Mesoscopic transport in ferromagnetic oxides
(Trinity College (Dublin, Ireland). School of Physics, 2002)The study presented in this thesis is concerned with mesoscopic transport in half metallic ferromagnetic oxides. Two techniques have been developed to gain insight into the extrinsic transport properties of these oxides. ... -
Investigations in real-time confocal microscopy
(Trinity College (Dublin, Ireland). School of Physics, 2002)This thesis is a study of imaging in real-time confocal imaging systems. The particular instrument examined is the direct-view microscope (DVM), an instrument which allows real-time confocal imaging through the use of an ... -
Structural, electronic and magnetic properties of ferromagnetic perovskites : a comparative study
(Trinity College (Dublin, Ireland). School of Physics, 2001)During the course of this research work, the physical properties of twelve mixed-valence manganites have been investigated and compared. Upon embarking on this project, the prospect of incorporating these newly re-discovered ... -
Investigation into semiconductor microcavity light emitting strucutres, and the assessment of InAs/GaAs quantum dots as sources for etched microstructures
(Trinity College (Dublin, Ireland). School of Physics, 2002)The spectral, spatial, and temporal characteristics of the spontaneous light emission process are dependent on the optical environment with which the emitter interacts. Cavity structures with dimensions of the order of the ... -
The physical properties of agent-based systems
(Trinity College (Dublin, Ireland). School of Physics, 2004)This thesis deals with the physical properties of agent-based systems. Agent models are powerful tools for understanding 'social' self¬organized systems and may provide an explanation of features typically found in many ... -
Dispersion of the third order optical nonlinearity & all-optical switching figures of merit in molecularly engineered polymers
(Trinity College (Dublin, Ireland). School of Physics, 2002)Solid state and solution measurements of the effective third order nonlinear absorption and refraction, have been earned out on poly (2,5-dioctyloxy-paraphenylene-vinylene-co-2,5- pyridinyl) (Pyridinyl PAV), poly ...
