Physics (Scholarly Publications): Recent submissions
Now showing items 401-420 of 1742
-
Electron trapping by neutral pristine ferroelectric domain walls in BiFeO3
(2018)First-principles calculations for pristine neutral ferroelectric domain walls in BiFeO3 reveal that excess electrons are selectively trapped by the domain walls, while holes are only weakly attracted. Such trapped excess ... -
Spectral overlap dependence of enhanced energy transfer near small au nanoparticles
(2014)We consider the effect of gold nanospheres of subwavelength dimension on the energy transfer rates and efficiencies between donor-acceptor pairs placed near the nanospheres. We investigate theoretically the ... -
Short pulse transmission characteristics in multi-contact SOA
(2012)An experimental characterisation of a multi-contact semiconductor optical amplifier using ultrashort optical pulses is presented. The SOA in question allows the injection of bias current through ... -
Plasmon-enhanced nonradiative energy transfer in a hybrid quantum well structure
(2015)Three different silver metal nanobox arrays are used to demonstrate plasmon-enhanced non-radiative energy transfer from an InGaN/GaN quantum well to a ~80 nm thick layer of CdSe/ZnS quantum dots ... -
Polarisation dependence of two-photon absorption generated by band-limited amplified spontaneous emission noise in silicon avalanche photodiodes
(2011)Two-photon absorption (TPA) generated by unpolarised band-limited amplified spontaneous emission (BL-ASE) noise is found to be within 5% of that generated by circularly polarised BL-ASE noise for silicon-based devices. A ... -
Effect of insertion layer on electrode properties in magnetic tunnel junctions with a zero-moment half-metal
(2019)Due to its negligible spontaneous magnetization, high spin polarization and giant perpendicular magnetic anisotropy, Mn2RuxGa (MRG) is an ideal candidate as an oscillating layer in THz spin-transfertorque nano-oscillators. ... -
An apparatus and methodology for high-power SQUID-detected ferromagnetic resonance measurements
(2019)Historically, ferromagnetic resonance has been dominated by inductive techniques, for the best part of the last 80 years. It has been only in the last 20 years that non-inductive techniques, such as Ferromagnetic Resonance ... -
4D full-vector radio frequency complex magnetic susceptibility mapping. Near-field imaging of RFID tags
(2019)Radio frequency identification (RFID) is a technology permeating both everyday life and scientific applications alike. The most prolific passive tag-based system uses inductively-powered tags with no internal power source ... -
Room-temperature ultraviolet luminescence from γ-CuCl grown on near lattice-matched silicon
(2005)We have probed the luminescence properties of a wide-band-gap, direct band-gap optoelectronic material, grown on closely lattice-matched silicon substrates, namely, γ-CuCl on Si. This material system is compatible with ... -
2D foams above the jamming transition: Deformation matters
(2017)Jammed soft matter systems are often modelled as dense packings of overlapping soft spheres, thus ignoring particle deformation. For 2D (and 3D) soft disks packings, close to the critical packing fraction ϕc, this results ... -
Influence of plasmonic array geometry on non-radiative energy transfer from a quantum well to a quantum dot layer
(IEEE, 2017)The influence of ordered plasmonic arrays on energy transfer from a quantum well to a quantum dot layer has been investigated. The ordered arrays are comprised of nanostructures of different geometries, including boxes, ... -
Quantum control of excitons for reversible heat transfer
(2019)Lasers, photovoltaics, and thermoelectrically-pumped light emitting diodes are thermodynamic machines which use excitons (electron-hole pairs) as the working medium. The heat transfers in such devices are highly irreversible, ... -
Equipartition of Energy Defines the Size-Thickness Relationship in Liquid-Exfoliated Nanosheets.
(2019)Liquid phase exfoliation is a commonly used method to produce 2D nanosheets from a range of layered crystals. However, such nanosheets display broad size and thickness distributions and correlations between area and ... -
Athermal tuning for a two-section, all-active DBR laser with high-order grating
(2018)We incorporate thermal effects for injection currents ranging up to 150 mA in order to model the tuning behavior of a two-section, all-active distributed-Bragg-reflector (DBR),ridge-wave guide semiconductor laser utilized ... -
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 ... -
Effective heat dissipation in an adiabatic near-field transducer for HAMR
(2018)To achieve a feasible heat-assisted magnetic recording (HAMR) system, a near-field transducer (NFT) is necessary to strongly focus the optical field to a lateral region measuring tens of nanometres ... -
Negative Gauge Factor Piezoresistive Composites Based on Polymers Filled with MoS2 Nanosheets
(2019)Nanocomposite strain sensors, particularly those consisting of polymer–graphene composites, are increasingly common and are of great interest in the area of wearable sensors. In such sensors, application of strain yields ... -
Quantifying the Trade-Off between Absolute Capacity and Rate Performance in Battery Electrodes
(2019)Among other things, battery electrodes need to display large absolute capacities coupled with high rate performance. However, enhancing areal capacity, for example via increased electrode thickness, results in reductions ... -
Whiskey-phase exfoliation: exfoliation and printing of nanosheets using Irish whiskey
(2019)Recent advances in the liquid-phase exfoliation (LPE) of layered materials have facilitated significant progress in the creation of functional inks. While ethanol/water blends have been shown to yield reasonable nanosheet ...
