We look at models of neutrino mass and mixing which represent an important aspect of physics beyond the Standard Model (SM). We derive approximate analytic formulae for the neutrino mixing angles in general SD involving NLO and NNLO corrections. These expressions, which are give…
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Multiphysics simulations of magnetic nanostructures by Matteo Franchin In recent years the research on magnetism has seen a new trend emerging, characterised by considerable effort in developing new nanostructures and nding new ways to control and manipulate their magnetisation,…
Semiconductor Seeded Fibre Amplified Sources of Ultra Short Pulses By Stephen Paul Elsmere This thesis reports upon an experimental investigation of passively mode-locked optically pumped vertical-external-cavity surface-emitting semiconductor lasers (VECSEL). Mode-locked VECSEL…
High Harmonic Generation is a highly nonlinear process that can be used to generate a high flux, low divergence, coherent beam in the extreme ultraviolet (XUV) wavelength range. It is proposed that this radiation source could be implemented for microscopy using coherent diffract…
This work is related to the investigation and development of novel concepts to utilise planar nanostructures in optics, aided by complementary research in the microwave domain—in particular: Strong polarisation conversion capabilities are shown for planar chiral nanoholes in the…
This thesis is concerned with the problem of reproducing a desired sound field with an array of loudspeakers. A theory based on functional analysis and the theory of integral equations is developed for the study of this problem. An attempt is made to develop a mathematical frame…
This study explores the principles of echolocation in bats which can be potentially adopted for bio-inspired sonar systems. Using a biological signal processing technique which was developed based on bat’s hearing system, the effect of auditory processing on the object discrimin…
In this thesis I investigate optical properties of metre - long tapers. Microstructured optical fibre technology has created new opportunities in a broad range of science and technology. In the work presented in this thesis I have combined the microstructured optical fibre techn…
Electromagnetic metamaterials are artificial media that derive novel properties from periodic structuring on the sub-wavelength scale. Here, the consequences of two-dimensional (2D) and three-dimensional (3D) chirality for the electromagnetic properties of metamaterials are inve…
Intrinsic parameter fluctuations have become a serious obstacle to the continued scaling of MOSFET devices, particularly in the sub-100 nm regime. The increase in intrinsic parameter fluctuations means that simulations on a statistical scale are necessary to capture device param…
The ^(12)C([gamma],pp) reaction has been studied in the photon energy range E_=200-450MeV at the Mainz Microtron, MAMI. The linearly polarised photon beam was produced via the coherent bremsstrahlung technique with a diamond radiator and tagged with the Glasgow Tagging Spectrome…
Z-contrast imaging, using a high-angle annular dark field detector, can be used to characterise III-V heterostructures. GaAs/AlAs heterostructures were grown using MBE and prepared for TEM using a cross-sectional method. SuperSTEM 1 was used to investigate both the GaAs-on-AlAs …
This thesis details the simultaneous extraction of three polarisation-dependent asymmetries in the distribution of real photons from the e p → e p γ interaction and its indistisguishable deeply virtual Compton scattering and Bethe-Heitler processes at the HERMES fixed-target expe…
This work presents the first ever measurements of several polarization observables for the reactions gamman->K0Lambda and gamman->K0Sigma0.
A study of the possibilities for a direct photon cross-section measurement is carried out, in the context of expectations for the first LHC collision data from the ATLAS experiment. Comparisons are made between Monte-Carlo predictions and an optimised method of selecting and rec…
In this thesis methods of accurately and reproducibly measuring intestinal content and transverse relaxation to study the fate of food in the gastrointestinal tract are reported. In addition to this a technique for measuring relaxation parameters in the brain at ultra-high field…
This thesis presents an investigation into the influence of magnetic cohesion on the stability of granular slopes. We consider magnetic cohesion that results from the interaction between dipole moments induced in grains by a uniform magnetic field. The repose angle of spheres is…
One of the phenomena associated with quantum integrable systems is the possibility of persistent currents, i.e. currents which do not decay away entirely, but have some portion that continues to flow undiminished and indefinitely. These residual currents are shown to be the cons…
The cold dark matter model has become the leading theoretical paradigm for the formation of structure in the Universe. Together with the theory of cosmic inflation, this model makes a clear prediction for the initial conditions for structure formation and predicts that structure…
The origin of the quantum mechanical spin of the proton in terms of its constituents is not yet fully understood. The discovery that the intrinsic spin of quarks contributes only a small fraction of the total proton spin sparked a huge theoretical and experimental effort to unde…