Physics: Recent submissions
Now showing items 301-320 of 2200
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Visualizing the Mott transition
(2012)Correlated electronic systems involve strong short-range repulsion. At integer filling, the primary effect of correlation is the emergence of an insulating state where band theory predicts a metal. Understanding the ... -
Transient Inhomogeneous Ionic Solutions -The Influence of the Magnetic Field Gradient
(Trinity College Dublin. School of Physics. Discipline of Physics, 2022)Solutions of paramagnetic ions and their response to magnetic field gradients of permanent magnets were studied. Paramagnetic fluids confined by solid walls only develop internal flows in a magnetic field gradient when a ... -
Thermodynamics of interacting many-body quantum systems
(Trinity College Dublin. School of Physics. Discipline of Physics, 2021)Technological and scientific advances have given rise to an era in which coherent quantum-mechanical phenomena can be probed and experimentally-realised over unprecedented timescales in condensed matter physics. In turn, ... -
Room-temperature plexcitonic strong coupling: Ultrafast dynamics for quantum applications
(2021)Strong light-matter interaction is at the heart of modern quantum technological applications and is the basis for a wide range of rich optical phenomena. Coupling a single quantum emitter strongly with electromagnetic ... -
Working Principle of Tunable PlasmonicReflect-Array Metasurfaces
(Trinity College Dublin. School of Physics. Discipline of Physics, 2021)This thesis will explore the way in which plasmonic metasurfaces, hosting nano-scale metallic resonator elements, can be used as beam-steering devices. We will propose our own devices that will demonstrate anomalous ... -
Synchronization in disordered oscillator lattices: Nonequilibrium phase transition for driven-dissipative bosons
(2021)We show that lattices of phase oscillators with random natural frequencies undergo a transition from a desynchronized to a synchronized state for dimensions d<4. The oscillators are described by a generalization of the ... -
Empirical Modelling of Public Lighting Emission Functions
(2021)Study of light at night has increased in recent decades due to the recognition of its impact on the environment, potential health concerns, as well as both the financial and carbon cost of energy waste. The advent of more ... -
Prismatic 2.0 Simulation software for scanning and high resolution transmission electron microscopy (STEM and HRTEM)
(2021)Scanning transmission electron microscopy (STEM), where a converged electron probe is scanned over a sample's surface and an imaging, diffraction, or spectroscopic signal is measured as a function of probe position, is an ... -
Thermoreflectance Imaging of Semiconductor lasers with a Numerical Thermal Model
(2021)High resolution surface temperature maps of a slotted surface grating laser operating at approx. 1550 nm are obtained by means of CCD-thermoreflectance imaging. The resolution is such that the temperature of the 2 μm ... -
Optical, thermal, and bit-writing analysis of a directly coupled plasmonic waveguide for heat-assisted magnetic recording
(2020)We investigate the energy conversion process and subsequent thermal and bit-writing performance of a plasmonic near-field transducer (NFT) under steady-state operation within heat-assisted magnetic recording (HAMR) devices. ... -
Spatially resolved self-heating and thermal impedance of laser diodes using CCD-TR imaging
(2021)The spatial distribution of the surface temperature of single and multi-section slotted semiconductor laser diodes with surface gratings is investigated experimentally with CCDthermoreflectance imaging. The lasers are ... -
1.3 μm wavelength tunable single-mode laser arrays based on slots
(2021)Two twelve-channel arrays based on surface-etched slot gratings, one with non-uniformly spaced slots and another with uniformly spaced slots are presented for laser operation in the O-band. A wavelength tuning range greater ... -
Wide range thermal and athermal operation of slotted surface grating lasers
(2021)Athermalisation is a procedure in which the wavelength of a semiconductor laser remains unchanged even as the temperature is altered. This is achieved by altering the currents that flow through the laser so as to maintain ... -
Directly accessing octave-spanning dissipative Kerr soliton frequency combs in an AlN microresonator
(2021)Self-referenced dissipative Kerr solitons (DKSs) based on optical microresonators offer prominent characteristics allowing for various applications from precision measurement to astronomical spectrometer calibration. To ... -
Near-octave-spanning breathing soliton crystal in an AlN microresonator
(2021)The soliton crystal (SC) was recently discovered as an extraordinary Kerr soliton state with regularly distributed soliton pulses and enhanced comb line power spaced by multiples of the cavity free spectral ranges (FSRs), ... -
Photolithography allows high-Q AlN microresonators for near octave-spanning frequency comb and harmonic generation
(2020)Single-crystal aluminum nitride (AlN) possessing both strong Pockels and Kerr nonlinear optical effects as well as a very large band gap is a fascinating optical platform for integrated nonlinear optics. In this work, fully ... -
Genetic algorithm optimization of high order surface etched grating tunable laser array
(2020)A genetic algorithm is developed with a view to optimizing surface-etched grating tunable lasers over a large optimization space comprised of several variables. Using this approach, a new iteration of slotted lasers arrays ... -
850 nm GaAs/AlGaAs DFB lasers with shallow surface gratings and oxide aperture
(2019)We present and experimentally demonstrate a novel oxide-confined ridge-waveguide distributed feedback (DFB) laser with the first-order surface grating using only a single growth step. The metal contacts are laterally offset ... -
X-ray Photoelectron Spectroscopy of Novel Ternary Materials
(Trinity College Dublin. School of Physics. Discipline of Physics, 2021)In this thesis the best synthesis conditions and compositional dependency of optoelectronic properties for novel ternary n-type amorphous Zinc Tin oxide (a-ZTO) and p-type nanocrystalline CuxCrO2 Transparent Conducting ...
