Browsing Physics (Theses and Dissertations) by Title
Now showing items 279-298 of 417
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Paramagnetic defects in thin carbon films
(Trinity College (Dublin, Ireland). School of Physics, 2003)This thesis is an investigation into paramagnetic defects in thin carbon films, their nature and the effects of deposition parameters and post deposition treatments. Electron paramagnetic resonance (EPR) is used to examine ... -
Passive thin film circuits of nanomaterials, inkjet printed on flexible temperature sensitive substrates
(Trinity College Dublin. School of Physics. Discipline of Physics, 2018)The objective of my work is threefold, firstly, to prepare functional ink dispersions of nanomaterials at high concentration with a well-defined narrow size distribution; secondly, to pattern low resistance, semiconducting ... -
Percolaton effects in nanostructured thin films
(Trinity College (Dublin, Ireland). School of Physics, 2013)Typically, materials with high electrical conductivity such as metals are opaque, and materials with high optical transparency such as glass are insulating. Finding materials that are both transparent to visible light and ... -
Photons in restricted topologies
(Trinity College (Dublin, Ireland). School of Physics, 2016)In this work we discuss three different aspects of the topological classification of propagating beams of light. This topological classification relies on global properties of the light beam, which are insensitive to local ... -
Piezoresistive Properties of 2D based Nanocomposites for Strain Sensing Applications
(Trinity College Dublin. School of Physics. Discipline of Physics, 2023)The superlative piezoresistive properties of nanomaterials and their composites have attracted great interest in the area of strain sensing. The field has grown exponentially over the past decade, benefiting from the ... -
Plasma diagnostics and hydrodynamic evolution of solar flares
(Trinity College (Dublin, Ireland). School of Physics, 2014) -
Plasmon resonance studies in silver nanoparticles arrays grown by Atomic Terrace Low Angle Shadowing (ATLAS)
(Trinity College (Dublin, Ireland). School of Physics, 2009)Nanotechnology refers to the study of nanomaterials aiming to understand the physical properties and phenomena that materials show at the nanometre scale. A key goal in nanotechnology is acquiring the ability to manipulate ... -
Plasmonic interactions of gold nanoparticles with photoluminescent materials
(Trinity College Dublin. School of Physics. Discipline of Physics, 2024)The variable plasmonic resonances of metal nanoparticles have many applications across a wide range of fields, including the modification of the emission of photoluminescent materials. The plasmonic interactions of gold ... -
Plasmonic Waveguides for Sub-wavelength Light Confinement
(Trinity College Dublin. School of Physics. Discipline of Physics, 2018)Modern electronic devices and circuits for information processing are rapidly approaching their ultimate speed and bandwidth limitations, which is an increasingly serious problem that impedes their continued use in scientific ... -
Plume dynamics in nanosecond and femtosecond laser ablation of metal
(Trinity College (Dublin, Ireland). School of Physics, 2010)This thesis examines the ablation plume produced from nanosecond and femtosecond laser ablation of metal targets in vacuum. Optical emission and absorption spectroscopy, a time-of-flight Langmuir ion probe and ablation ... -
Point contact Andreev reflection and tunneling spectroscopy using high-field superconductors, topological insulators and compensated ferrrimagnets
(Trinity College (Dublin, Ireland). School of Physics, 2017)Spin electronics is a young and thriving research and technology field which relies more on the spin of the electron rather than its charge. The tunneling magnetoresistance and giant magnetoresistance effects have been ... -
Polarisation effects in semiconductor optical amplifiers
(Trinity College (Dublin, Ireland). School of Physics, 2007)Optical switches based on SOAs are critical elements for the implementation of alloptical gating. The various wavelength conversion schemes are limited by their polarisation sensitivity. The polarisation sensitivity of ... -
Polymer crystallisation of a reinforcement mechanism for polymer-carbon nanotube composites
(Trinity College (Dublin, Ireland). School of Physics, 2005)Two semi-crystalline polymers, poly(mphenylenevinylene-co-2,5-dioctyloxy-p-phenylenevinylene) (PmPV) and poly(vinyl alcohol) (PVOH), have been doped with carbon nanotubes. In the case of PmPV, well-graphitised arc discharge ... -
Polymeric waveguides for use as solid state laser materials
(Trinity College (Dublin, Ireland). School of Physics, 2000)The work presented is intended to identify promising candidate materials for use as solid state lasers utilising planar optical waveguides, and to gain an insight into the physical processes that may be controlled through ... -
Post-fabrication tuning of Hybrid Plasmonic Nanostructures with VO2
(Trinity College Dublin. School of Physics. Discipline of Physics, 2023)The development of hybrid plasmonic nanostructures and metamaterials to control electromagnetic radiation on the nanoscale has been at the centre of scientific research for the past few decades. Utilising the surface plasmon ... -
Precise modification of 2D materials by gas ion beams
(Trinity College Dublin. School of Physics. Discipline of Physics, 2018) -
Precision diagnostics of pulsation and evolution in helium-rich low-mass stars
(Trinity College Dublin. School of Physics. Discipline of Physics, 2019)In this thesis we discuss many types of low mass stars linked by their unusually low hydrogen atmospheric abundance, usually completely replaced with helium. We begin with the hot subdwarfs; subdwarf O and B (sdB, sdO) ... -
Preparation and characterisation of carbon nanotube films and composites
(Trinity College (Dublin, Ireland). School of Physics, 2008)A simple method of carbon nanotube (NT) composite preparation has been demonstrated that produces wide ranging and extremely high carbon nanotube mass fraction, mf, composites with minimal reagregation of the nanotubes (up ... -
Preparation, characterisation and technological applications of half-metallic ferromagnetic oxides in ceramic and thin film form
(Trinity College (Dublin, Ireland). School of Physics, 2001)The aims of this study were: (i) to study the structural, magnetic and transport properties of ferromagnetic oxides (La0.7 Sr0.3)MnO3 and A2FeMoO6 (A=Ca, Sr, Ba) in polycrystalline and thin film form, (ii) to optimise the ... -
Printed Electronics from Solution-Processed 2D Materials
(Trinity College Dublin. School of Physics. Discipline of Physics, 2018)The fervour created in the wake of the graphene gold-rush has fuelled investigative momentum over the last decade. The maturity of liquid-phase processing has meant that solution-processed layered crystals can be now be ...
