Browsing Physics (Theses and Dissertations) by Title
Now showing items 259-278 of 417
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On the control of quantum many-body systems
(Trinity College Dublin. School of Physics. Discipline of Physics, 2022)The ability to control and actively manipulate physical systems at a scale at which quantum properties manifest themselves is crucial for the development of quantum technologies. While, at present, it is possible to ... -
On the ejection of high velocity massive stars from star clusters
(Trinity College (Dublin, Ireland). School of Physics, 2008)OB1 runaways are massive, early-type, high velocity stars which have been ejected from their parent birthplaces. Some of which have velocities above 200km/s. Two mechanisms are plausible explanations for these objects: A ... -
Optical and electrical characterisation of hexabenzocoronene derivative molecular self-assemblies
(Trinity College (Dublin, Ireland). School of Physics, 2006)In this thesis the optical properties of molecular aggregates of Hexa-peri-benzocoronene derivatives are investigated for evidence of Frenkel Exciton Resonance (FER). Using photo-luminescence and optical absorption measurement ... -
Optical and electrical properties of modified conjugated polymer thin films
(Trinity College (Dublin, Ireland). School of Physics, 2003)The ability to control both the spectral and electrical stability of polymer light emitting devices are just two of the parameters that are paramount to their commercial viability. The presence of water vapour and oxygen ... -
Optical and EUV studies of laser triggered Z-pinch discharges
(Trinity College (Dublin, Ireland). School of Physics, 2014)This thesis describes the results of experiments with two geometries of laser assisted discharge plasma. Both devices are designed for fast Z-pinch discharge, triggered by laser produced plasma generated by ablation of one ... -
Optical and X-ray characterization of the magnetic properties of gold capped cobalt nanowires grown on Pt(997)
(Trinity College (Dublin, Ireland). School of Physics, 2011) -
Optical characterisation and manipulation of active microspheres
(Trinity College (Dublin, Ireland). School of Physics, 2007)Spherical microcavities are of great interest for both photonic applications and for fundamental physics. In this thesis, a novel active dielectric microsphere emitter coated with colloidal CdTe nanocrystals is studied. ... -
Optical characterisation of blue-green-emitting polymer gain media : light amplification, laser emission, and two-photon absorption
(Trinity College (Dublin, Ireland). School of Physics, 2006)Blue-green emitting stilbene dyes have been incorporated into different inert polymer hosts. Steady-state absorption and emission spectroscopy revealed a considerable host dependence of the spectroscopic properties of these ... -
Optical Characterisation of Metallic and Biological Nanoparticles
(Trinity College Dublin. School of Physics. Discipline of Physics, 2023)Nanotechnology is a rapidly growing technology with applications that affect many industries in the global economy. Two such industries are optoelectronics and healthcare. With the increased demand for smaller, more ... -
Optical impedance matching studied with Scanning Near-Field Optical Microscopy
(Trinity College (Dublin, Ireland). School of Physics, 2003)This thesis is a study of reflection-mode Scanning Near-Field Optical Microscopy (SNOM). A microscope was built for non-invasive imaging of samples, with optical resolutions better than the diffraction limit. The microscope ... -
Optical investigations of the magnetic properties of iron nanostructures grown on tungsten(110)
(Trinity College (Dublin, Ireland). School of Physics, 2007)The structural and magnetic properties of ultra-thin Fe films and Fe nanostripes grown on vicinal W(110) are studied using Reflectance Anisotropy Spectroscopy (RAS), and the non-linear optic techniques of Second Harmonic ... -
Optical properties and photoluminescence quantum yields of carbon nanotube dispersions
(Trinity College (Dublin, Ireland). School of Physics, 2011)The absorbance and photoluminescence (PL) spectra of single-walled carbon nanotubes (SWNTs) dispersed in deuterium oxide (D2O) using various surfactants were examined in order to estimate the photoluminescence quantum yield ... -
Optical properties of capped metallic nanostructures, grown on silicon
(Trinity College (Dublin, Ireland). School of Physics, 2011) -
Optical Transmitters based on High-Order Surface Grating Lasers for Applications in Communication Systems
(Trinity College Dublin. School of Physics. Discipline of Physics, 2021)Optical communication is the forefront of modern communication systems and is unarguably the leading technology for information sharing and transmission of large amounts of data over longer distances with low latency. Since ... -
The Optics and Photonics of Two-Dimensional Nanomaterials
(Trinity College Dublin. School of Physics. Discipline of Physics, 2020)In this work, by using a broadspectrum angle-resolved absorption technique, we studied enhanced absorption from multi-layered materials with near-zero dielectric permittivity in the near-infrared. These materials, known ... -
Optimisation of Electrolytically-gated Thin Film Transistors made from Printed Nanosheet Networks
(Trinity College Dublin. School of Physics. Discipline of Physics, 2022)Networks of two-dimensional nanosheets show great potential in a wide variety of different applications, with particular focus on the area of printed electronics. One of the main issues facing such nanosheet network ... -
Optimisation of non-Markovian systems using tensor networks
(Trinity College Dublin. School of Physics. Discipline of Physics, 2024)Structured environments that do not admit simple time-local descriptions display a wealth of features which are otherwise absent from unstructured environments. Here we use optimal control to learn how to perform quantum ... -
Optimization techniques in elastic proton-proton collisions
(Trinity College (Dublin, Ireland). School of Physics, 2000)The proton spin puzzle has intrigued experimentalists and theorists since the surprising result from the EMC experiment at CERN in 1988, which found a smaller than expected contribution to the spin of the proton from the ... -
Organic light emitting diodes - new emissive materials and device architecture
(Trinity College (Dublin, Ireland). School of Physics, 2007)Organic materials are now used for a variety of electronic devices including organic light-emitting diodes (OLEDs). However, most organic electronic display applications require more efficient red, green and blue OLEDs ... -
Organic light-emitting diodes and photovoltaic devices: Incorporation of carbon nanotubes as charge transport media
(Trinity College (Dublin, Ireland). School of Physics, 2003)The effects of incorporating multi-walled carbon nanotubes (MWNT) in two existing functional organic devices : organic light emitting diodes (OLEDs) and organic solar cells have been studied. Single layer OLEDs and organic ...
