Index Catalog // ScholarsArchive@OSU

A new technique for high performance tandem time-of-flight mass spectrometry

Creator:: Katz, Daniel Louis
Abstract:: The main result of this written dissertation is a mathematical solution to the problem of multiplex recording for high performance tandem time-of-flight mass spectrometry. The prescription is to use a time-lag accelerator in the second stage to match the ion optical properties of the decay fragments to the requirements of...
Resource Type:: Dissertation

Heavy fermion effective mass in the superconducting vortex state

Creator:: Townsend, Emily A.
Abstract:: The extended-Lifshitz-Kosevitch formalism (ELK) unifies the treatment of the de Haas-van Alphen (dHvA) effect, allowing it to transcend its traditional roles of mapping Fermi surfaces and measuring effective masses. Here we exploit the capabilities of dHvA as a probe of many-body effects to examine heavy-fermion su- perconductivity. ELK successfully describes...
Resource Type:: Dissertation

Metallic nanoscale conductors

Creator:: Nebergall, Nathan Sky
Abstract:: A new, reproducible method of using electromigration to form metallic nano-conductors is developed using gold and a tin-silver alloy. Measurements revealed a quantization of the electrical conductance consistent with the theory of quantum conductance. The theory of quantum conductance is applied to show that a nano-conductor with a cross-section of...
Resource Type:: Masters Thesis

Generation and manipulation of THz waves

Creator:: Amer, Naaman
Abstract:: In this thesis I studied several THz components that can be used for potential THz technology. THz waves were generated in nonlinear medium via optical rectification of femtosecond optical pulses. Utilizing the phase matching condition between the optical and THz waves in a ZnTe crystal, single-cycle broad-band THz pulses were...
Resource Type:: Dissertation

Subwavelength light confinement and quantum chaos in micro- and nano-structured metamaterials

Creator:: Govyadinov, Alexander A.
Abstract:: This dissertation concerns a broad range of unique phenomena related to the light propagation at nano- and micro-scales. To access the nano-domain, we introduce anisotropy-based waveguides with positive- and negative-index modes. These novel structures allow energy propagation in subwavelength regions and, in contrast to surface waves, have the mode structure...
Resource Type:: Dissertation

The nonlinear optical properties of gallium arsenide pertaining to terahertz generation

Creator:: Hurlbut, Walter C.
Abstract:: Gallium arsenide shows excellent promise for terahertz generation using mid infrared. This is for two reasons. First, the indices of refraction for the terahertz (nTHz=3.61 at 1 THz) and mid infrared (nopt=3.431 at 2 μm) are close allowing a long interaction length. Second, the linear absorption is low at terahertz...
Resource Type:: Dissertation

Mode patterns in quadrupole resonator with anisotropic core

Creator:: Thongrattanasiri, Sukosin
Abstract:: This thesis deals with applications of uniaxial anisotropic crystals for microcavity resonators with partially chaotic underlying ray dynamics. We develop an implementation of the scattering matrix formalism, and relate the eigenvalues and eigenvectors of the scattering matrix to the field distribution of inside the system. Using the developed technique, we...
Resource Type:: Masters Thesis

Generation of narrowband THz pulses and THz studies of ultrafast phenomena in semiconductor quantum wells

Creator:: Danielson, Jeremy R.
Abstract:: This work comprises two main parts: creating and shaping narrowband, pulsed THz radiation in a table-top optical setup; and applying THz pulses to semiconductor nanostructures to study electron dynamics. I developed a scheme to shape the THz output of a fanned-out periodically poled lithium niobate (PPLN) crystal. The pulses are...
Resource Type:: Dissertation

Breaking of spherical symmetry in electronic structure, free and immersed atoms in an electron gas

Creator:: Dorsett, Skye Forrest
Abstract:: Total electronic energies are calculated numerically for free and singly-ionized He, Li, C, and Ne atoms using density functional theory. Immersion energies are calculated for a single C impurity atom embedded or absorbed into a charge-neutral system composed of a free-electron gas with uniform positive background, also called 'jellium'. Nonspherical...
Resource Type:: Dissertation

ScholarsArchive@OSU

A new technique for high performance tandem time-of-flight mass spectrometry

Heavy fermion effective mass in the superconducting vortex state

Metallic nanoscale conductors

Generation and manipulation of THz waves

Subwavelength light confinement and quantum chaos in micro- and nano-structured metamaterials

The nonlinear optical properties of gallium arsenide pertaining to terahertz generation

Mode patterns in quadrupole resonator with anisotropic core

Generation of narrowband THz pulses and THz studies of ultrafast phenomena in semiconductor quantum wells

Breaking of spherical symmetry in electronic structure, free and immersed atoms in an electron gas

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