Browsing Physics by Sponsor "Enterprise Ireland"
Now showing items 1-20 of 38
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All-optical sampling based on two-photon absorption in a semiconductor microcavity for high-speed OTDM
(SPIE, 2005)Future high-speed optical communications networks operating at data rates in excess of 100Gbit/s per channel will require a sensitive and ultrafast technique for precise optical signal monitoring.1 The standard way ... -
An alternative fluorine precursor for the synthesis of SnO2:F by spray pyrolysis
(2012)An alternative, non-toxic precursor was employed for the synthesis of SnO2:F transparent conducting oxide. The performance of benzenesulfonyl fluoride (BSF) as F source for spray pyrolysis was investigated. Its decomposition ... -
Angular Distribution of electron temperature and density in a laser-ablation plume
(American Physical Society, 2000)The angular distribution of electron temperature and density in a laser-ablation plume has been studied for the first time. The electron temperature ranges from 0.1 to 0.5 eV and is only weakly dependent on the angle in ... -
Band structures of rare gas solids within the GW approximation
(2005)Band structures for solid rare gases s Ne, Ar d have been calculated using the GW approximation. All electron and pseudopotential ab initio calculations were performed using Gaussian orbital basis sets and the ... -
A Bayesian approach to comparing theoretic models to observational data: A case study from solar flare physics
(2011)Solar flares are large-scale releases of energy in the solar atmosphere, which are characterized by rapid changes in the hydrodynamic properties of plasma from the photosphere to the corona. Solar physicists have typically ... -
Confined optical modes and amplified spontaneous emission from a microtube cavity formed by vacumm assisted filtration
(American Physical Society, 2006)The authors demonstrate a new route to the fabrication of individual aluminosilicate microtubes that can act as micron-scale optical cylindrical resonators. The microtubes were prepared using a simple vacuum assisted wetting ... -
The Crystal Structure of Bubbles in the Wet Foam Limit (Amendment)
(Royal Society of Chemistry, 2006)We have observed a rich variety of three-dimensional crystal and defect structures spontaneously formed by small (diameter 200 mm) bubbles in a wet foam. The observations confirm and extend those made by Bragg and Nye ... -
Cylindrical permanent-magnet structures using images in an iron shield
(IEEE, 2003)We report on cylindrical permanent-magnet structures that exploit the image effect in a surrounding circular soft-iron sheath. We present the theory for a general multipole ring, where the polarization direction ? = (n + ... -
Dynamics of the plume produced by nanosecond ultraviolet laser ablation of metals
(American Physical Society, 2003)The dynamics of the ablation plume of a partially ionized plasma produced by a nanosecond UV laser with different irradiation spot geometries has been explored. We have used an ensemble of quartz crystal microbalances to ... -
Effect of ZnS shell thickness on the phonon spectra in CdSe quantum dots
(American Physical Society, 2003)The evolution of the optical phonon spectra of colloidal core/shell CdSe/ZnS quantum dots with an increase of the shell thickness from 0.5 to 3.4 monolayers has been studied by resonant Raman spectroscopy. The results ... -
Effects of excitonic diffusion on stimulated emission in nanocrystalline ZnO
(American Institute of Physics, 2006)We present optically pumped emission data for ZnO, showing that high excitation effects and stimulated emission/lasing are observed in nanocrystalline ZnO thin films at room temperature, although such effects are not ... -
EG and: Far ultraviolet spectroscopic explorer and Hubble space telescope STIS monitoring of an eclipsing symbiotic binary
(American Astronomical Society, 2008)We present highlights and an overview of 20 FUSE and HST STIS observations of the bright symbiotic binary EG And. The main motivation behind this work is to obtain spatially resolved information on an evolved giant star ... -
Evidence for internal tether-cutting in a flare/coronal mass ejection observed by Messenger, Rhessi, and Stereo
(2010)The relationship between eruptive flares and coronal mass ejections (CMEs) is a topic of ongoing debate, especially regarding the possibility of a common initiation mechanism. We studied the kinematic and hydrodynamic ... -
Exchange coupling in CaMnO3 and LaMnO3: Configuration interaction and the coupling mechanism
(2002)The equilibrium structure and exchange constants of CaMnO3 and LaMnO3 have been investigated using total-energy unrestricted Hartree-Fock (UHF) and localized orbital configuration interaction (CI) calculations on bulk ... -
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 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 ... -
Growth of n-type ?-CuCl with improved carrier concentration by pulsed dc sputtering: Structural, electronic and UV emission properties
(2011)? Copper (I) chloride is naturally a direct band gap, zincblende and p-type semiconductor material with much potential in linear and non-linear optical applications owing to its large free excitonic binding energy. In order ... -
Impact of bias current distribution on the noise figure and power saturation of a multicontact semiconductor optical amplifier
(2011)We present an experimental investigation of a multicontact semiconductor optical amplifier. This first-generation device allows for direct control of the carrier density profile along the length of the waveguide. This is ...