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Graduate Theses and Dissertations

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Tuning Of Layered Materials: Studies Of Craute4, Pdsn4 And Wte2, Na Hyun Jo Jan 2019

Tuning Of Layered Materials: Studies Of Craute4, Pdsn4 And Wte2, Na Hyun Jo

Graduate Theses and Dissertations

Layered materials are of great and growing interest for material scientists and condensed matter physicists, not only because of their possible applications but also because of the diverse and controllable ground states. In addition, tuning of layered materials through external fields, doping, or strain can lead to the emergence of novel phenomena. In this dissertation, the importance of the study of layered materials is emphasized in Chapter 1. Before getting into experimental results, the theoretical background and experimental methods, including growth of single crystals of selected layered materials, are introduced in Chapter 2 and Chapter 3. Chapters 4, 5 and ...


Symmetry Reduction In K − P Problems, Benjamin Sheller Jan 2019

Symmetry Reduction In K − P Problems, Benjamin Sheller

Graduate Theses and Dissertations

$K-P$ problems are a class of geometric optimal control problems on finite-dimensional real semisimple Lie groups which arise, for example, in the control of quantum systems when the Lie group is $SU(n)$. In these problems, the sub-Riemannian distribution corresponds to the $\p$-part of a Cartan decomposition (also known as the $-1$ eigenspace of a Cartan involution), and these systems are totally controllable. However, finding a particular optimal trajectory can be in general a computationally difficult problem, and from an analytic perspective, the Lie groups are sufficiently complicated to make finding such objects as the cut locus difficult. $K-P ...


A Fundamental Investigation Into Low Thermal Conductivity P-Type Chalcogenides And Skutterudites With Potential Thermoelectric Applications, Dean Hobbis Sep 2018

A Fundamental Investigation Into Low Thermal Conductivity P-Type Chalcogenides And Skutterudites With Potential Thermoelectric Applications, Dean Hobbis

Graduate Theses and Dissertations

Sustainable and renewable energy is an incredibly important area in today’s society and investigation into avenues to improve this wide ranging technology are underway in many different fields. Thermoelectric devices possess the ability for the direct solid-state interconversion of heat and electrical power, which not only allows for sustainable refrigeration but also waste heat recovery. One current restriction on the efficiency of thermoelectric devices is the disparity in thermoelectric performance of p-type and n-type materials. Furthermore, a key physical attribute shared by the majority of high performing thermoelectric materials is low thermal conductivity. Thus in this thesis three separate ...


The Effect Of Processing Conditions On The Energetic Diagram Of Cdte Thin Films Studied By Photoluminescence, Shamara P. Collins Jul 2018

The Effect Of Processing Conditions On The Energetic Diagram Of Cdte Thin Films Studied By Photoluminescence, Shamara P. Collins

Graduate Theses and Dissertations

The photovoltaic properties of CdTe-based thin films depend on recombination levels formed in the CdTe layer and at the heterojunction. The localized states are resultant of structural defects (metal sublattice, chalcogen sublattice, interstitial), controlled doping, deposition process, and/or post-deposition annealing. The photoluminescence study of CdTe thin films, from both the bulk and heterojunction, can reveal radiative states due to different defects or impurities. Identification of defects allows for potential explanation of their roles and influence on solar cell performance. A thorough understanding of the material properties responsible for solar cell performance is critical in further advancing the efficiency of ...


Surface And Interface Effects Of Magnetoimpedance Materials At High Frequency, Tatiana M. Eggers Jun 2018

Surface And Interface Effects Of Magnetoimpedance Materials At High Frequency, Tatiana M. Eggers

Graduate Theses and Dissertations

Amorphous and nanocrystalline transition metal magnetic alloys (TMMAs) have been the subjects of fundamental and applied study due to their unique structure. The lack of long-range order in these materials sets the stage for their soft magnetic properties to be tuned for a variety of technological applications, such as sensitive magnetic field sensors, high frequency transformers, and stress sensors. Fundamental investigation of the magnetic and structural properties of these materials is also motivated by their unique amorphous or nanocrystalline-embedded amorphous matrix morphology, which has consequences on both the magnetism seen from both the atomic and macro-scale. The surfaces of these ...


The Association Of Size Variation In The Dental Arch To Third Molar Agenesis For A Modern Population, Devin N. Williams Apr 2018

The Association Of Size Variation In The Dental Arch To Third Molar Agenesis For A Modern Population, Devin N. Williams

Graduate Theses and Dissertations

The frequency with which individuals do not develop their third molars, or wisdom teeth, is increasing worldwide. This current topic of human evolution is relevant to the research of anthropologists, geneticists, dentists, and other researchers involved in the study of human dentition. Many explanations have been offered to account for the prevalence of molar agenesis including, evolutionary, environmental, and genetic theories. The purpose of this research project is to determine the frequency of third molar agenesis and investigate the relationship between third molar agenesis and maxillomandibular jaw dimensions in a sample of orthodontic patients. This research tests the hypotheses that ...


Characterization Of Computed Tomography Radiomic Features Using Texture Phantoms, Muhammad Shafiq Ul Hassan Apr 2018

Characterization Of Computed Tomography Radiomic Features Using Texture Phantoms, Muhammad Shafiq Ul Hassan

Graduate Theses and Dissertations

Radiomics treats images as quantitative data and promises to improve cancer prediction in radiology and therapy response assessment in radiation oncology. However, there are a number of fundamental problems that need to be solved in order to potentially apply radiomic features in clinic. The first basic step in computed tomography (CT) radiomic analysis is the acquisition of images using selectable image acquisition and reconstruction parameters. Radiomic features have shown large variability due to variation of these parameters. Therefore, it is important to develop methods to address these variability issues in radiomic features due to each CT parameter. To this end ...


Coarse-Grained Modeling Studies Of Polymeric And Granular Systems, Hong Trung Nguyen Apr 2018

Coarse-Grained Modeling Studies Of Polymeric And Granular Systems, Hong Trung Nguyen

Graduate Theses and Dissertations

This Dissertation is devoted to computational study of the solidification, dynamics and mechanics of model semiflexible polymers with variable chain flexibility as well as a computational investigation of the clogging phenomena observed in granular materials.

Chain stiffness is an intrinsic factor that governs single-chain flexibility. It plays a critical role in the physics of polymeric materials. In this work, we employ a coarse-grained polymer model in which chain stiffness can be tuned by a single parameter (bending stiffness kb) that yields chain shape ranging from coil-like to rod-like in the flexible and very stiff limit respectively. In chapter 2, we ...


Computational Discovery Of Energetic Polynitrogen Compounds At High Pressure, Brad A. Steele Apr 2018

Computational Discovery Of Energetic Polynitrogen Compounds At High Pressure, Brad A. Steele

Graduate Theses and Dissertations

High-nitrogen-content energetic compounds containing multiple N-N bonds are an attractive alternative towards developing new generation of environmentally friendly, and more powerful energetic materials. High-N content translates into much higher heat of formation resulting in much larger energy output, detonation pressure and velocity upon conversion to large amounts of non-toxic, strongly bonded N2 gas. This thesis describes recent advances in the computational discovery of group-I alkali and hydrogen polynitrogen materials at high pressures using powerful first-principles evolutionary crystal structure prediction methods. This is highlighted by the discovery of a new family of materials that consist of long-sought after all-nitrogen N􀀀 5 ...


Jet Longitudinal Double Spin Asymmetry In Phenix $P+P \Sqrt{S} = 510 Gev$, Milap Patel Jan 2018

Jet Longitudinal Double Spin Asymmetry In Phenix $P+P \Sqrt{S} = 510 Gev$, Milap Patel

Graduate Theses and Dissertations

The longitudinal double-spin asymmetry

(A\textsubscript{LL}) in spin-polarized \emph{p+p} collisions provides insight into the gluon contribution to the proton's spin by accessing the gluon helicity distribution $\Delta$g. Prior PHENIX $\pi$\textsuperscript{0} and STAR jet A\textsubscript{LL} measurements show a non-zero asymmetries and hence indicate a nonzero $\Delta$g in an NLO analysis. The STAR measurements of jet A\_LL in $\surd$s = 200 and 510 GeV polarized p+p collisions provide the strongest constraints on $\Delta$g at intermediate to high \textit{x}. A measurement of the jet A\textsubscript{LL} at $\surd ...


Multiphysics Analysis Of Electrochemical And Electromagnetic System Addressing Lithium-Ion Battery And Permanent Magnet Motor, Abhishek Sarkar Jan 2018

Multiphysics Analysis Of Electrochemical And Electromagnetic System Addressing Lithium-Ion Battery And Permanent Magnet Motor, Abhishek Sarkar

Graduate Theses and Dissertations

Lithium-ion batteries are the leading energy storage technology in the electronic-driven society. With the need for portable, long-life electronics the demand for lithium batteries has escalated over the decade. Lithium-ion batteries show remarkable electrochemical characteristics, including but not limited to, long cycle-life, high cut-off voltages and high energy-density. However, lithium-ion cells are problematic to design due to their inherent thermal and/or mechanical instability. The objective of the current research framework is to establish the criteria causing thermo-mechanical failure of the battery systems, material properties effecting the performance, and model cycle-life degradation due to electrolyte loss by solid electrolyte interface ...


Measurement Of The Kaon Production Normalization In The Numi Target Using Uncontained Charged-Current Muon Neutrino Interactions In The Nova Far Detector, Jose Andres Sepulveda-Quiroz Jan 2018

Measurement Of The Kaon Production Normalization In The Numi Target Using Uncontained Charged-Current Muon Neutrino Interactions In The Nova Far Detector, Jose Andres Sepulveda-Quiroz

Graduate Theses and Dissertations

NOvA is a long-baseline neutrino oscillation experiment that uses the NuMI beam from Fermilab.

Its physics goals include providing constraints to the neutrino mass hierarchy and the CP-violating phase $\delta$ by precision measurements of the electron (anti)neutrino

appearance in a muon (anti)neutrino beam.

Similarly, new limits on the values of $\sin^2{\theta_{23}}$ and $\Delta m^{2}_{32}$ will be achieved by measurements of the muon (anti)neutrino disappearance probabilities.

A combined analysis measurement will allow a better resolution of the $\theta_{23}$ octant.

The NuMI beam is produced by the collision of high energy protons ...


Pressure Effects On Magnetism And Superconductivity, Udhara Sampath Kaluarachchi Jan 2018

Pressure Effects On Magnetism And Superconductivity, Udhara Sampath Kaluarachchi

Graduate Theses and Dissertations

This thesis summarizes experimental work using high pressure as a tuning parameter in the study of selected correlated electron systems at low temperatures. This thesis contains 8 chapters and 2 appendices. After giving the introduction in Chapter 1, experimental techniques are discussed in Chapter 2. Chapters 3 and 5 are devoted to pressure studies of ferromagnetic materials. In ferromagnetic systems, the appearance of quantum criticality is avoided either by a change of the second order transition to one of the first-order at a tricritical point or by the appearance of modulated, antiferromagnetic, phase. Chapter 3 summarizes the pressure study of ...


Biophysics Of Cadherin Interactions And Junction Assembly, Omer Shafraz Jan 2018

Biophysics Of Cadherin Interactions And Junction Assembly, Omer Shafraz

Graduate Theses and Dissertations

Desmosomes are robust cell adhesion junctions that are composed of two transmembrane desmosomal cadherin proteins: desmoglein (Dsg) and desmocollin (Dsc). The extracellular regions of Dsc and Dsg form an adhesive interface between cells while their cytoplasmic tails links to the intracellular keratin filament network. This dissertation investigates how Dsc and Dsg assemble into desmosomes using single molecule force measurements with an Atomic Force Microscope (AFM) and cell-based fluorescence assays. In Chapter 1, I give a brief over view of the content of this dissertation and the principles of AFM force measurements. In Chapter 2, I characterize the binding of isoform ...


Constraints On Neutrino Oscillation Parameters With The Nova Experiment, Erika Cantano-Mur Jan 2018

Constraints On Neutrino Oscillation Parameters With The Nova Experiment, Erika Cantano-Mur

Graduate Theses and Dissertations

NOvA is a long-baseline neutrino oscillation experiment, which consists of two finely-segmented liquid-scintillator detectors

operating 14 mrad off-axis from the NuMI muon neutrino beam. With an 810 km baseline, the combined measurements of muon neutrino disappearance and electron neutrino appearance allow the determination of neutrino oscillation unknowns, namely the mass hierarchy, the octant of the largest neutrino mixing angle, and the CP violating phase.

In this dissertation, I present the joint analysis of $\nu_\mu\to\nu_\mu$ and $\nu_mu\to\nu_e$ oscillation data with an exposure of

$8.85\times10^{20}$ protons on target on the 14 kton detector ...


Structural And Magnetic Studies On Srco2as2 And Ca(Co1−Xfex)Yas2 Compounds Using X-Ray And Neutron Scattering, Wageesha Tharuki Jayasekara Jan 2018

Structural And Magnetic Studies On Srco2as2 And Ca(Co1−Xfex)Yas2 Compounds Using X-Ray And Neutron Scattering, Wageesha Tharuki Jayasekara

Graduate Theses and Dissertations

The AM2X2 (A = alkaline, alkaline earth or rare earth element M = transition metals, and X = pnictogen), 122 type ternary compounds acquire overwhelming attention due to their richness of the correlations and competition between the lattice, electronic, and magnetic degrees of freedom. Properly controlling those correlations can lead to a variety of novel ground states including different crystallographic structures, magnetically ordered states, or high-temperature superconductors. This thesis summarizes experimental work using high pressure and element substitution as tuning parameters in the study of selected 122 systems to understand their diverse structural and magnetic properties and interplay between the magnetism and electronic ...


Biodetection And Biointerface Based On Nanostructured Aluminum Oxide (Nao): From Fluorescence Enhancement To Ms Effect On Single Neural Cells, Xiangchen Che Jan 2018

Biodetection And Biointerface Based On Nanostructured Aluminum Oxide (Nao): From Fluorescence Enhancement To Ms Effect On Single Neural Cells, Xiangchen Che

Graduate Theses and Dissertations

Anodic aluminum oxide (AAO) has been investigated and utilized in numerous products for almost a century. But the rapidly increasing interest in nanoscale materials and their outstanding properties has propelled nanoporous AAO to be used as a substrate for sensors and biosensors. Fluorescence-based biosensors are one type of optical biosensors which are very popular for detecting a variety of targets (DNA, RNA, glucose, enzyme, bacteria, etc.). The recent discovery of AAO fluorescence enhancement effect makes AAO more attractive since it has the great potential to be used in biosensing field to improve the sensor sensitivity. However, the mechanism of the ...


Growth, Properties And Magnetism Of Cakfe4as4, William Richard Meier Jan 2018

Growth, Properties And Magnetism Of Cakfe4as4, William Richard Meier

Graduate Theses and Dissertations

CaKFe4As4 is a new stoichiometric member of the iron-based superconductors (FeSCs) which is a superconductor below 35 K. In this thesis I outline how single crystals of this material are grown for the first time and their basic properties. I discuss how substituting Ni or Co for Fe stabilizes antiferromagnetism at the expense of superconductivity. I reveal how the crystal structure of CaKFe4As4 leads to the observed hedgehog spin-vortex crystal magnetic order instead of the magnetic structures adopted by the other FeSCs. Finally, I propose a series of new magneto-elastic couplings in this new magnetic structure.


Exotic Phases In Strongly Correlated Materials, Guanghua Zhang Jan 2018

Exotic Phases In Strongly Correlated Materials, Guanghua Zhang

Graduate Theses and Dissertations

In strongly correlated materials, the electron-electron interaction is much stronger than the kinetic energy and plays a determining role in the properties of such materials. The strong electron-electron interaction often gives rise to exotic physical phenomena, such as high-temperature superconductivity, quantum Hall effects, Mott insulators, heavy fermion systems, and quantum criticality. There is no unified and effective approach to understand the physics in different materials, however, many of the same techniques generalize to different scenarios. In this thesis, we will discuss two types of exotic phases: the nematic order above the double-stripe magnetism, and hastatic order which originates from two-channel ...


Interface Energy Transport Of Two-Dimensional (2d) Mos2, Pengyu Yuan Jan 2018

Interface Energy Transport Of Two-Dimensional (2d) Mos2, Pengyu Yuan

Graduate Theses and Dissertations

The bottleneck of most modern technologies and energy solutions has been attributed to the thermal problems at the nanoscale. Especially, the thermal transport across interfaces and in-plane direction can significantly influence the overall performance of 2D nanosystems. So accurate thermal-physical characterization of the 2D materials is very important for both fundamental research and industrial applications.

Focusing on 2D mechanically exfoliated MoS2, at first, we conduct a detailed temperature and laser power dependent micro-Raman spectroscopy study of FL MoS2 (4.2 to 45 nm thick) on c-Si substrate. We measured the interfacial thermal resistance (R) at room temperature decreases with increased ...


Study Of The Energy Gap Structure In Iron-Based Superconductors Using London Penetration Depth And Controlled Artificial Disorder, Serafim Teknowijoyo Jan 2018

Study Of The Energy Gap Structure In Iron-Based Superconductors Using London Penetration Depth And Controlled Artificial Disorder, Serafim Teknowijoyo

Graduate Theses and Dissertations

A combination of London penetration depth and artificial disorder was used to probe the energy gap structure and symmetry of a few members of the iron-based superconductor systems. Information regarding the gap structure and symmetry is an important clue which helps uncover the mechanism behind the unconventional, non-BCS-type superconductors. We used the tunnel-diode resonator method to do London penetration depth measurements with high precision down to 50~mK base temperature. The disorder is introduced by electron irradiation, which was performed at the SIRIUS facility in Ecole Polytechnique (Palaiseau France) to produce point-like disorder in the materials of study. Non-magnetic defects ...


Studies Of Spin Dynamics In 122 Transition Metal Arsenides Using Inelastic Neutron Scattering Technique, Aashish Sapkota Jan 2018

Studies Of Spin Dynamics In 122 Transition Metal Arsenides Using Inelastic Neutron Scattering Technique, Aashish Sapkota

Graduate Theses and Dissertations

The diverse physical properties and interrelationship between various ground states offer a rich physics to explore in 122 $A$TM$_2$As$_2$ ($A = $Ca, Sr, Ba and TM = 3d transition metals). This thesis discusses three examples of the 122 $A$TM$_2$As$_2$ compounds, TM = Fe, Co and Mn, where the focus is to understand their diverse magnetic properties and interplay between the magnetism and electronic properties including superconductivity. Therefore, the spin dynamics (spin fluctuations) of these compounds were studied using inelastic neutron scattering technique.

CaFe$_2$As$_2$ and the derived compounds are the first system discussed ...


Search For New Long-Lived Hadronically-Decaying Particles Produced In Association With A Z Boson With The Atlas Detector At The Lhc, Michael Werner Jan 2018

Search For New Long-Lived Hadronically-Decaying Particles Produced In Association With A Z Boson With The Atlas Detector At The Lhc, Michael Werner

Graduate Theses and Dissertations

The standard model fails to fully explain several observations about the universe, one of the

prominent ones is the existence of dark matter. Many different models have been proposed for

dark matter candidates, but it is possible that the dark matter itself will remain elusive. Dark

sector models contain both dark matter and a new force which acts upon it. The force-carrying

boson of this dark sector may be more easily detected than dark matter itself. These models

contain a number of free parameters, some combinations of which result in the dark sector

particle being long-lived but unstable, resulting in ...


Structures And Dynamics Investigation Of Phase Selection In Metallic Alloy Systems, Lin Yang Jan 2018

Structures And Dynamics Investigation Of Phase Selection In Metallic Alloy Systems, Lin Yang

Graduate Theses and Dissertations

Different phases of metallic alloys have a wide range of applications. However, the driving mechanisms of the phase selections can be complex. For example, the detailed pathways of the phase transitions in the devitrification process still lack a comprehensive interpretation. So, the understanding of the driving mechanisms of the phase selections is very important.

In this thesis, we focus on the study of the Al-Sm and other related metallic alloy systems by simulation and experiment. A procedure to evaluate the free energy has been developed within the framework of thermodynamic integration, coupled with extensive GPU-accelerated molecular dynamics (MD) simulations; The ...


Nuclear Magnetic Resonance Studies Of Magnetic Fluctuations And Nematic Order In Iron-Based Superconductors, Paul Waymouth Wiecki Jan 2018

Nuclear Magnetic Resonance Studies Of Magnetic Fluctuations And Nematic Order In Iron-Based Superconductors, Paul Waymouth Wiecki

Graduate Theses and Dissertations

This thesis illustrates the use of the nuclear magnetic resonance (NMR) technique as a local probe for the study of static and dynamic magnetism in the iron-based superconductors.

First, a Korringa ratio analysis of 59Co and 75As NMR data reveals the existence of ferromagnetic (FM) spin fluctuations in SrCo2As2 and the hole- and electron-doped BaFe2As2 families of iron-pnictide superconductors. The analysis further shows that the FM fluctuations compete with AFM fluctuations to suppress superconductivity in these materials. The FM fluctuations are thus a crucial ingredient to understanding the variability of the superconducting transition temperature (Tc) and the shape of the ...


Design And Simulation Of A Miniature Cylindrical Mirror Auger Electron Energy Analyzer With Secondary Electron Noise Suppression, Jay A. Bieber Nov 2017

Design And Simulation Of A Miniature Cylindrical Mirror Auger Electron Energy Analyzer With Secondary Electron Noise Suppression, Jay A. Bieber

Graduate Theses and Dissertations

In the nanoscale metrology industry, there is a need for low-cost instruments, which have the ability to probe the structrure and elemental composition of thin films. This dissertation, describes the research performed to design and simulate a miniature Cylindrical Mirror Analyzer, (CMA), and Auger Electron Spectrometer, (AES). The CMA includes an integrated coaxial thermionic electron source. Electron optics simulations were performed using the Finite Element Method, (FEM), software COMSOL. To address the large Secondary Electron, (SE), noise, inherent in AES spectra, this research also included experiments to create structures in materials, which were intended to suppress SE backgound noise in ...


Manipulating Electromagnetic Waves With Enhanced Functionalities Using Nonlinear And Chiral Metamaterials, Sinhara Rishi Malinda Silva Nov 2017

Manipulating Electromagnetic Waves With Enhanced Functionalities Using Nonlinear And Chiral Metamaterials, Sinhara Rishi Malinda Silva

Graduate Theses and Dissertations

Metamaterials are artificial structures, which periodically arranged to exhibit fascinating electromagnetic properties, not existing in nature. A great deal of research in the field of metamaterial was conducted in a linear regime, where the electromagnetic responses are independent of the external electric or magnetic fields. Unfortunately, in linear regime the desired properties of metamaterials have only been achieved within a narrow bandwidth, around a fixed frequency. Therefore, nonlinearity is introduced into metamaterials by merging meta-atoms with well-known nonlinear materials. Nonlinear metamaterials are exploited in this dissertation to introduce and develop applications in microwave frequency with broadband responses. The nonlinearity was ...


Growth, Characterization, And Function Of Ferroelectric, Ferromagnetic Thin Films And Their Heterostructures, Mahesh Hordagoda Nov 2017

Growth, Characterization, And Function Of Ferroelectric, Ferromagnetic Thin Films And Their Heterostructures, Mahesh Hordagoda

Graduate Theses and Dissertations

With recent trends in miniaturization in the electronics sector, ferroelectrics have gained popularity due to their applications in non-volatile RAM. Taking one step further researchers are now exploring multiferroic devices that overcome the drawbacks of ferroelectric (FE) and ferromagnetic (FM) RAM’s while retaining the advantages of both. The work presented in this dissertation focuses on the growth of FE and FM thin film structures. The primary goals of this work include, (1) optimization of the parameters in the pulsed laser deposition (PLD) of FE and FM films and their heterostructures, (2) development of a structure-property relation that leads to ...


Surfaces And Epitaxial Films Of Corundum-Structured Mixed Metal Oxides., Alan Richard Kramer Nov 2017

Surfaces And Epitaxial Films Of Corundum-Structured Mixed Metal Oxides., Alan Richard Kramer

Graduate Theses and Dissertations

Throughout the last half century of materials science, significant motivations came from, and still do, the industrial applications of these materials. Whether it is electronic, thermal, tribological or chemical in nature, the study of metals, semiconductors and insulators eventually reveals that the surface plays a significant part in the properties of these materials. Understanding metal terminations reveals often that an oxide is the stable state of the metallic surface in an ambient atmosphere and the ability to predict and control these oxides has led to significant strides forward in not just the metallic bulk but the oxide as well.

Here ...


Application Of Metamaterials To Rf Energy Harvesting And Infrared Photodetection, Clayton M. Fowler Nov 2017

Application Of Metamaterials To Rf Energy Harvesting And Infrared Photodetection, Clayton M. Fowler

Graduate Theses and Dissertations

Techniques for adapting metamaterials for the improvement of RF energy harvesting and infrared photodetection are demonstrated using experimental and computer simulation methods. Two methods for RF energy harvesting are experimentally demonstrated and supported by computer simulation. In the first method, a metamaterial perfect absorber (MPA) is made into a rectenna capable of harvesting RF energy and delivering power to a load by soldering Schottky diodes onto connected split ring resonator (SRR) structures composing the planar metasurface of the perfect absorber. The metamaterial rectenna is accompanied by a ground plane placed parallel to it, which forms a Fabry-Perot cavity between the ...