Browsing School of Physics by Title
Now showing items 615-634 of 2105
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Expansion dynamics of laser produced plasma
(2011)We consider the applicability of the isentropic, adiabatic gas dynamical model of plume expansion for laser ablation in vacuum. We show that the model can be applied to ionized plumes and estimate the upper electron ... -
Experimental analysis of polarization dependence of ultrafast gain dynamics in SOAs
(2005)Nonlinear polarization rotation in semiconductor optical amplifiers has been the focus of a lot of work in the past decade. A lot of research has been devoted to this phenomenon due to its possible use in all-optical ... -
Experimental and computational investigation of structure and magnetism in pyrite Co1-xFexS2: Chemical bonding and half-metallicity
(American Physical Society, 2004)Bulk samples of the pyrite chalcogenide solid solutions Co1?xFexS2 s0?x?0.5d, have been prepared and their crystal structures and magnetic properties studied by x-ray diffraction and SQUID magnetization measurements. Across ... -
Experimental and Theoretical Investigation of the Distance Dependence of Localized Surface Plasmon Coupled Forster Resonance Energy Transfer
(2014)The distance dependence of localized surface plasmon (LSP) coupled Förster resonance energy transfer (FRET) is experimentally and theoretically investigated using a trilayer structure composed of separated monolayers of ... -
Experimental investigation of polarisation rotation in semiconductor optical amplifiers
(IEEE, 2004)An experimental study of polarisation rotation in a semiconductor optical amplifier is presented. Two techniques are used to investigate the gain and birefringence along the two eigenmodes of the component waveguide, with ... -
Experimental Investigation of Polarization Effects in Semiconductor Optical Amplifiers and Implications for All-Optical Switching
(2008)A free-space contra-propagation configuration is implemented and pump-probe studies are undertaken in order to study polarization-dependent gain dynamics in bulk semiconductor optical amplifiers (SOAs) and their application ... -
Experimental observation of scaling laws for alternating current and direct current conductivity in polymer-carbon nanotube composite thin films
(2002)Alternating current (ac) and direct current (dc) conductivities have been measured in polymer-nanotube composite thin films. This was carried out for a range of concentrations of multiwall nanotubes in two polymer hosts, ... -
Experimental quantitative study into the effects of electromigration field moderation on step bunching instability development on Si(111)
(2011)We experimentally studied the effects of a moderated electromigration field on the dynamics of the step bunching process on the Si(111) surface at 1130 ?C (regime II) and 1270 ?C (regime III). The surfaces with step bunch ... -
An experimental realisation of the Weaire-Phelan structure in monodisperse liquid foam
(2012)The Weaire-Phelan (WP) structure is the lowest energy structure known of an ideal monodisperse foam in the dry limit. To date, it has not been realized in the laboratory. Instead Lord Kelvin's 1887 structure, which it ... -
Experimental reconstructions of 3D atomic structures from electron microscopy images using a Bayesian genetic algorithm
(2022)We introduce a Bayesian genetic algorithm for reconstructing atomic models of monotype crystalline nanoparticles from a single projection using Z-contrast imaging. The number of atoms in a projected atomic column obtained ... -
An exploration of two-dimensional materials for solar energy harvesting
(Trinity College Dublin. School of Physics. Discipline of Physics, 2020)The rise in energy demand around the globe can only be met with sustainable and long-term reliance on alternative renewable energy sources. In this context, the goal of this thesis is to conceive a method through which ... -
Exploring New and Enhanced Optical Functionalities in Coupled Nano-Systems
(Trinity College Dublin. School of Physics. Discipline of Physics, 2018)In this thesis, a variety of novel emerging systems were chosen to explore new and enhanced optical functionalities in coupled nano-systems. The coupling of novel nanomaterials with complimentary properties paves the way ... -
Exploring the cation dynamics in lead-bromide hybrid perovskites
(2016)Density functional theory including a many-body treatment of dispersive forces is used to describe the interplay between structure and electronic properties of two prototypical Br-based hybrid perovskites, namely, CH ... -
Exploring the coordination chemistry of bifunctional organoarsonate ligands: Syntheses and characterisation of coordination polymers that contain 4-(1,2,4-triazol-4-yl)phenylarsonic acid
(2014)This account describes the coordination chemistry of a novel bifunctional arsonic acid ligand, 4-(1,2,4-triazol-4-yl)phenylarsonic acid (H2TPAA) that contains a triazole group. Hydrothermal reactions of transition metal ... -
Exploring the limits of the self consistent Born approximation for inelastic electronic transport
(2009)The non equilibrium Green function formalism is today the st andard computational method for describing elastic transport in molecular devices. This ca n be extended to include inelastic scattering by the so called ... -
Exponential behavior of the interlayer exchange coupling across nonmagnetic metallic superlattices
(1998)It is shown that the coupling between magnetic layers separated by nonmagnetic metallic superlattices can decay exponentially as a function of the spacer thickness N, as opposed to the usual N-2 decay. This effect is due ... -
Exposition of semiconducting and ferromagnetic properties of pulsed-laser-deposited thin films of LaFe1-xNixO3 (x=0.3, 0.4, and 0.5)
(American Institute of Physics, 2005)We have explored the possibility of ferromagnetic semiconducting property in the epitaxial thin films of LaFe1?xNixO3 x=0.3, 0.4, and 0.5 grown on 001 oriented LaAlO3 substrate. We observe that substitution of Ni in ... -
Extracting the hysteresis loops of magnetic interfaces from optical second-harmonic intensity measurements
(2007)Surface- and interface-sensitive optical techniques, such as optical second-harmonic generation (SHG), allow the buried interfacial structure of centrosymmetric materials to be explored through thin capping layers, and ...