Browsing Physics (Theses and Dissertations) by Title
Now showing items 146-165 of 420
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Interactions of Plasmonic and Dielectric Structures with 2D Materials
(Trinity College Dublin. School of Physics. Discipline of Physics, 2023)Three separate systems of nanoparticles coupled to two-dimensional materials are studied. Each system is investigated both experimentally and numerically with FDTD simulations. The first system involves a nanoparticle-on-mirror ... -
Interface properties of Fe3O4/MgO and surface studies of Fe3O4(110)
(Trinity College (Dublin, Ireland). School of Physics, 2006)The research project described in this Ph.D. thesis can be divided into two parts. The first, consisting in the description of a new instrument, the low temperature tunneling device (LTTD), designed and built in order to ... -
Inverse Problems in Disordered Systems
(Trinity College Dublin. School of Physics. Discipline of Physics, 2023)It is a simple Quantum Mechanics problem to find the electronic conductance of a device by directly solving the Schrodinger Equation. Obviously, this is the case if and only if the underlying Hamiltonian is known, i.e., ... -
Investigating of gas sensing and diode laser frequency stabilisation using novel photonic microstructures
(Trinity College (Dublin, Ireland). School of Physics, 2010)Laser spectroscopy is nowadays a widespread research field with countless applications across multiple disciplines. In particular, the application to gas sensing in the near-infrared region significantly benefits from the ... -
Investigating the Feasibility of Photostimulation for the Development of a Low Energy-Spread Electron Microscope Source.
(Trinity College Dublin. School of Physics. Discipline of Physics, 2024)Electron microscopes use fast-moving electrons as illumination to generate high resolution images down to the atomic scale. They are a valuable tool in various research fields, from palaeontology to material science. Low ... -
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 ... -
An Investigation into the Accretion Processes of Young Stellar Objects
(Trinity College Dublin. School of Physics. Discipline of Physics, 2023)The way in which young stars form is complex and fascinating, and is anything but a smooth, continuous process. Studying their dramatic, and sometimes violent, early years of accreting and ejecting material is vital in ... -
Investigation of copper chloride for photonics applications
(Trinity College (Dublin, Ireland). School of Physics, 2011)Wide band gap semiconductors have found multiple applications. Being light emitters in the range of blue and UV, materials like GaN or ZnO have been applied to highly efficient blue light emitting diodes, and increasingly ... -
Investigation of electronic structure and optical properties of organic molecular semiconductor materials by X-ray spectroscopies
(Trinity College (Dublin, Ireland). School of Physics, 2009)The electronic structure of thin films of several members of the metal phthalocyanine (MPc) and metal chelate families of organic molecular semiconductors have been studied using resonant soft x-ray emission spectroscopy, ... -
Investigation of low voltage Fabry-Perot modulators for optical interconnect applications
(Trinity College (Dublin, Ireland). School of Physics, 2001)Optical interconnect technology is one of the proposed solutions to the fast approaching communication bottleneck in electronic digital systems, arising from the bandwidth limitations of electrical interconnects. Optical ... -
Investigation of nanosecond and femtosecond pulsed laser deposition and application of some metal nanoparticle films
(Trinity College (Dublin, Ireland). School of Physics, 2012)Pulsed laser deposition (PLD) is a convenient and flexible technique which can be applied to all elemental and compound solids. In conventional PLD a nanosecond (ns) laser is used to ablate the surface of a solid target ... -
Investigation of near-infrared laser diodes for application in space-based spectroscopic gas sensing
(Trinity College (Dublin, Ireland). School of Physics, 2007)The availability of numerous semiconductor diode lasers that provide wavelength tuneable, high output power, single frequency emission in the near infrared region of the spectrum (0.7μm - 2.5μm) provides researchers with ... -
Investigation of organic / ferromagnet interface and magnetoresistive characteristics of small molecule organic semiconductors
(Trinity College (Dublin, Ireland). School of Physics, 2013)Spin injection, transport and dynamics in organic semiconductors are of growing interest as the field of organic spin electronics begins to take shape during the last decade. This new field of research aims to manipulate ... -
Investigation of Polymer-based Responsive Photonic Structures Fabricated by Two Photon Polymerisation
(Trinity College Dublin. School of Physics. Discipline of Physics, 2024)In this thesis, various 2D and 3D submicron polymer-based photonic structures are investigated for structural colour generation. 2D diffractive gratings have been designed and theoretically investigated by using ... -
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 ... -
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 ... -
Ion outflow and soft X-ray radiation from a micro capillary discharge source and laser produced plasma
(Trinity College (Dublin, Ireland). School of Physics, 2002)This thesis concerns itself with the study of pulsed plasma sources. The plasma is produced either in an electrical discharge or by a laser pulse. The plasma is generated on a nanosecond time scale, after which it evolves ... -
Issues relating to the application of monolithic tuneable laser diodes to multi-species gas detection
(Trinity College (Dublin, Ireland). School of Physics, 2005)Tuneable Diode Laser Absorption Spectroscopy (TDLAS) technology for gas sensing has had reliance on, and has benefited from, devices developed for the optical communications sector, namely distributed feedback laser diodes. ... -
The Jacobi-Legendre framework for Machine Learning in Materials Investigation and Discovery
(Trinity College Dublin. School of Physics. Discipline of Physics, 2024)Machine-learning models have rapidly become fundamental tools in the study of materials properties. In the past few years there has been a surge of interest in the construction of new models and descriptors to accelerate ... -
Kinematic properties of globally-propagating waves in the solar corona
(Trinity College (Dublin, Ireland). School of Physics, 2012)Globally-propagating bright fronts in the solar corona are a poorly understood phenomena despite almost 15 years of research. Here, the kinematics and morphology of these disturbances are studied using Extreme UltraViolet ...
