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Now showing items 471-480 of 2111
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 ...
Two-photon-absorption in semiconductor micro-cavities
(Trinity College (Dublin, Ireland). School of Physics, 2006)
In this thesis a study of two-photon absorption photoconductivity in semiconductor microcavities is presented. It can be shown that a 10,000-fold enhancement of the non-linear two-photon absorption response can be obtained ...
Mechanisms of Imprint Effect on Ferroelectric Thin Films
(2005)
We have developed a single/double layer model to explain horizontal shifting of measured D-E hysteresis loops (imprint) for ferroelectric thin films. Such phenomenon can be explained by considering three mechanisms or their ...
Femtosecond ultraviolet laser ablation of silver and comparison with nanosecond ablation
(2013)
The ablation plume dynamics arising from ablation of silver with a 500 fs, 248nm laser at
2Jcm
2
has been studied using angle-resolved Langmuir ion probe and thin film deposition techniques. For
the same laser fluence, ...
Surfing Multiple Conformation-Property Landscapes via Machine Learning: Designing Single-Ion Magnetic Anisotropy
(2020)
Computational statistical disciplines, such as machine learning, are leading to a paradigm shift in the way we conceive the design of new compounds, offering a way to directly design the best compound for specific applications. ...
Spin-pumping and inelastic electron tunneling spectroscopy in topological insulators
(2013)
We demonstrate that a quantum spin Hall current, spontaneously generated at the edge of a two-dimensional topological insulator, acts as a source of spin pumping for a magnetic impurity with uniaxial anisotropy. One can ...
Manipulation of Vanadium Oxide Characteristics for Applications: Resistive switching & Reflectance Anisotropy Spectroscopy
(Trinity College Dublin. School of Physics. Discipline of Physics, 2022)
This thesis deals with the study of vanadium dioxide, vanadium pentoxide and the mixed 4+ and 5+ valence vanadium oxide phases, or Wadsley phases. Thin films (VO2) and single crystals (V2O5) are examined. Vanadium dioxide ...
Reactive Plasma N-Doping of Amorphous Carbon Electrodes: Decoupling Disorder and Chemical Effects on Capacitive and Electrocatalytic Performance
(2020)
Nitrogen-free amorphous carbon thin films prepared via sputtering followed by graphitization, were used as precursor materials for the creation of N-doped carbon electrodes with varying degrees of amorphization. Incorporation ...
Magnetic structure of an amorphous rare-earth transition-metal alloy
(American Physical Society, 1976)
161Dy Mossbauer spectra show that the dysprosium moments in amorphous DyCo3.4 are strongly coupled to the local crystal field axes. The magnetic structure is one in which the cobalt "sublattice" is strongly ferromagnetic, ...
Suppression of Residual Single-Photon Absorption Relative to Two-Photon Absorption in High Finesse Planar Microcavities
(2008)
Suppression of residual single-photon absorption
(SPA) relative to two-photon absorption (TPA) in a high finesse
GaAs planar microcavity is explored. The TPA photocurrent
becomes larger than the SPA photocurrent as long ...