Browsing School of Physics by Title
Now showing items 2005-2024 of 2105
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Tuning and characterization of self-assembled plasmonic nanoparticle arrays
(Trinity College (Dublin, Ireland). School of Physics, 2015)This thesis details the development and use of a novel nano-entity fabrication technique. The technique is based on a glancing angle deposition (GLAD) on transparent stepped templates. It is demonstrated that the technique ... -
Tuning behaviour of slotted vernier widely tunable lasers
(2019)A detailed thermo-optic model combining the 1D transfer matrix method and a 3D finite element method is developed and used to simulate a widely tunable vernier laser based on surface etched slots. The model is used to ... -
Tuning of oxygen vacancy-induced electrical conductivity in Ti-doped hematite films and its impact on photoelectrochemical water splitting
(2020)Titanium (Ti)-doped hematite (α-Fe2O3) films were grown in oxygen-depleted condition by using the spray pyrolysis technique. The impact of post-deposition annealing in oxygen-rich condition on both the conductivity and ... -
Tuning the crystallographic, morphological, optical and electrical properties of ZnO:Al grown by spray pyrolysis
(Elsevier B.V., 2014)In this contribution the effect of different deposition conditions on the physical properties of ZnO:Al grown by spray pyrolysis is outlined. In particular, it will be shown that the solvent composition affects the ... -
Tunnel magnetoresistance of disordered low-moment Co2MnSi Heusler alloy films
(American Institute of Physics, 2005)Thin films of Co(1?x?y)MnxSiy (x = 0.18?0.26 and y = 0.23?0.29) were deposited from elemental targets onto thermal-oxidized Si substrates at room temperature using dc magnetron cosputtering. The as-deposited films appear ... -
Tunneling magnetoresistance in Si nanowires
(2016)We investigate the tunneling magnetoresistance of small diameter semiconducting Si nanowires attached to ferromagnetic Fe electrodes, using fi rst principles density functional theory combined with the non-equilibrium ... -
Tunneling processes in asymmetric double barrier magnetic tunnel junctions with a thin top MgO layer
(2013)Dynamic conductance dI/dV and inelastic electron tunneling spectroscopy (IETS) d 2I/dV 2 have been measured at different temperatures for double barrier magnetic tunnel junctions with a thin top MgO layer. The resistance ... -
Tunnelling interlayer exchange coupling between oxide ferromagnets: Analysis for Fe3O4/vac/Fe3O4 case
(2009)We have investigated tunneling interlayer exchange coupling (TIEC) between ferrimagnetic Fe3O4 ?lms via a tunneling barrier. In this investigation we employ ab-initio density functional theory to study a generic tunneling ... -
Tunnelling magnetoresistance of the half-metallic compensated ferrimagnet Mn<inf>2</inf>Ru<inf>x</inf>Ga
(2016)Tunnel magnetoresistance ratios of up to 40% ar e measured between 10 K and 300 K when the highly spin-polarized compensated ferrimagnet, Mn 2 Ru x Ga, is integrated into MgO-based perpendicular magnetic tunnel ... -
Turbulence-assisted shear exfoliation of graphene using household detergent and a kitchen blender
(2014)To facilitate progression from the lab to commercial applications, it will be necessary to develop simple, scalable methods to produce high quality graphene. Here we demonstrate the production of large quantities of ... -
Two-dimensional foam rheology with viscous drag
(American Physical Society, 2006)We formulate and apply a continuum model that incorporates elasticity, yield stress, plasticity, and viscous drag. It is motivated by the two-dimensional foam rheology experiments of Debregeas et al. [Phys. Rev. Lett. ... -
Two-dimensional Förster resonant energy transfer in a mixed quantum dot monolayer: Experiment and theory
(2009)Energy transfer in monolayers of CdTe quantum dots (QDs), comprised of QDs of two different sizes, has been investigated. Förster resonant energy transfer (FRET) from QD donors to QD acceptors was observed and characterized ... -
Two-dimensional Model of Self-Pulsation in AlGaAs Laser Diodes
(SPIE, 2004)The use of a fully two-dimensional waveguide analysis of the optical modes in a self-pulsating laser is described. We show that there is a need for such an analysis as the effective index model often used for modeling ... -
"Two-Dimensional Nanosheets Produced by Liquid Exfoliation of Layered Materials"
(2011)If they could be easily exfoliated, layered materials would become a diverse source of 2-dimensional crystals whose properties would be useful in applications from electronics to energy storage. We show that layered ... -
The two-dimensional viscous froth model for foam dynamics
(American Physical Society, 2004)The two-dimensional viscous froth model is a simple tractable model for foam rheology and coarsening. It includes, but is not confined to, the quasistatic regime. Here we present a detailed analysis and implementation of ... -
Two-photon absorption based detection in semiconductor microcavities
(Trinity College (Dublin, Ireland). School of Physics, 2009)The most important feature of a two-photon absorption microcavity (TPAM) is that of its enhancement of the optical field which enhances the level of twophoton absorption (TPA) for a particular input optical power incident ... -
Two-photon absorption generated by optically amplified signals
(2008)Two-photon absorption generated by band-limited amplified spontaneous emission noise was found to be twice that generated by a continuous-wave optical signal with the same average power. A simple formula for describing the ... -
Two-photon absorption photocurrent enhancement in bulk AlGaAs semiconductor microcavities
(2002)We report on two-photon absorption ~TPA! photocurrent in semiconductor microcavities. We experimentally show a substantial increase in the TPA photocurrent generated, at resonance, in a GaAlAs/GaAs microcavity designed ... -
Two-photon induced photoconductivity enhancement in semiconductor microcavities: a theoretical investigation
(2002)We describe a detailed theoretical investigation of two-photon absorption photoconductivity in semiconductor microcavities. We show that high enhancement (by a factor of >10,000) of the nonlinear response can be obtained ...