Browsing Physics by Title
Now showing items 2075-2094 of 2105
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The wave properties of coronal bright fronts observed using SDO/AIA
(2011)Coronal bright fronts (CBFs) are large scale wavefronts that propagate though the solar corona at hundreds of kilometers per second. While their kinemat- ics have been studied in detail, many questions remain regarding the ... -
Waveguide Loss Measurement Using the Reflection Spectrum
(2008)A method for waveguide loss measurement purely based on the reflection spectrum is proposed. Using the Fourier series expansion of the single longitudinal mode in the reflection spectrum, the ratio between the second ... -
Wavelength, concentration, and distance dependence of nonradiative energy transfer to a plane of gold nanoparticles.
(2012)Nonradiative energy transfer to metal nanoparticles is a technique used for optical-based distance measurements which is often implemented in sensing. Both Förster resonant energy transfer (FRET) and nanometal surface ... -
Weak ferromagnetism and magnetoelectric coupling in bismuth ferrite
(American Physical Society, 2005)We analyze the coupling between the ferroelectric and magnetic order parameters in the magnetoelectric multiferroic BiFeO3 using density functional theory within the local spin density approximation (LSDA) and the LSDA+U ... -
Weyl points and exceptional rings with polaritons in bulk semiconductors
(2020)Weyl points are the simplest topologically protected degeneracy in a three-dimensional dispersion relation. The realization of Weyl semimetals in photonic crystals has allowed these singularities and their consequences to ... -
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 ... -
Whispering Gallery Mode Emission from a Composite System of CdTe Nanocrystals and a Spherical Microcavity
(2003)We have studied the optical properties of a novel quantum dot?microcavity system consisting of CdTe nanocrystals attached to a melamine formaldehyde latex microsphere. The spheres were studied using conventional and ... -
White light conical diffraction
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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 ... -
A Wind analysis of an evolved Giant. FUSE and HST/STIS observations of an eclipsing Symbiotic Binary
(European Space Agency, 2005)A major outstanding problem in stellar astrophysics lies in understanding the wind generation mechanism by which evolved giants lose mass. Phase-resolved observations of eclipsing symbiotic binary systems, containing ... -
The winds of low-mass stars and solar-wind evolution
(Trinity College Dublin. School of Physics. Discipline of Physics, 2020)Stellar winds affect the evolution of stars (as well as impacting the planets orbiting these stars) through the removal of angular momentum and mass over time. This process changes the rotation rate of the host star, which ... -
Winds of Planet Hosting Stars
(2015)The field of exoplanetary science is one of the most rapidly growing areas of astrophysical research. As more planets are discovered around other stars, new techniques have been developed that have allowed ... -
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 ... -
X-ray and radio diagnostics of accelerated electrons in solar active regions
(Trinity College (Dublin, Ireland). School of Physics, 2015) -
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 ... -
The X-ray spectroscopic diagnosis of laser-produced plasmas, with emphasis on line broadening
(American Physical Society, 1980)A detailed account is given of the x-ray spectroscopic diagnosis of plasmas formed by exploding pusher microballoons. The measurements of the electron temperature from the shell and from the core is described. A method for ... -
X-ray spectroscopic studies of the electronic structure of chromium based p-type transparent conducting oxides
(Trinity College Dublin. School of Physics. Discipline of Physics, 2018)In this thesis the electronic, optical, electrical, and mechanical properties of two p-type transparent conducting oxides will be explored, primarily by spectroscopic techniques. The initial chapters outline how the ... -
X-ray spectroscopic studies of the electronic structure of chromium-based p-type transparent conducting oxides
(2016)The valence band structure of p-type transparent oxides—crystalline MgxCr2−xO3 and nanocrystalline CuxCrOy—is analyzed as a function of incoming photon energy. The valence band of both p-type transparent conducting oxides ...