Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 18 of 18 for “"negative index"”.
-
All-optical metamaterial modulators : fabrication, simulation and characterization
… features of metamaterials is to obtain negative refraction, termed left-handed materials or negative-index metamaterials, over a limited frequency band. Negative-index metamaterials at near infrared wavelength are fabricated with circular, elliptical and rectangular holes penetrating …
-
Tailoring Optical and Plasmon Resonances in Core-Shell and Core-Multishell Nanowires
… (CMS) NWs can be tailored to achieve novel negative-index metamaterials (NIM), extreme absorbers, invisibility cloaks and sensors. Particularly, in this dissertation, the versatility of CS and CMS NWs for the design of negative-index metamaterials in the visible range and, plasmonic light …
-
Analysis of Mueller matrices of metamaterials and multiferroics
… (i) their interesting optical effects, such as Negative Index of Refraction (NIR) and impedance matching; and (ii) possible device applications such as switching devices and anti-reflection coatings. Proper characterization of complex materials requires advanced spectroscopic approaches and the …
-
Acoustic metamaterial design and applications
… opportunity to develop an artificial media with negative refractive index and the application in superlens which allows super-resolution imaging. High-resolution acoustic imaging techniques are the essential tools for nondestructive testing and medical screening. However, the spatial resolution …
-
Understanding new regimes for light-matter interactions
… a 3D photonic crystal slab structure to exhibit negative-index behavior at visible wavelengths, which was fabricated and experimentally demonstrated by our collaborators to show negative refraction with, to our knowledge, the lowest loss at visible wavelengths to date.
-
Theory, Simulation, Fabrication and Testing of Double Negative and Epsilon Near Zero Metamaterials for Microwave Applications
<p>Natural structures exhibiting simultaneous negative bulk permittivity and permeability have not yet been discovered. However, research interest over the past five years has grown with the proposition that artificial structures exhibiting these properties are realizable using specially-designed …
-
Negative-group-delay and Non-foster Electromagnetic Structures
… novel electromagnetic applications using negative-group-delay (NGD) and non-Foster structures and establishes an intimate connection between these two phenomena. As a result, novel implementations of non-Foster reactive elements using NGD networks are proposed. To this end, NGD and …
-
Progress in metamaterials : magnetic hybridization of electric dipole resonance and inhomogeneous structures for thin-film lenses
… The resonances in the permeability and the negative index response exhibit anti-crossing behavior. We simulate this using a simple analytic model, as well as rigorous coupled wave analysis (RCWA). A theoretical model and experimental data are in good agreement and clearly demonstrate …
-
Measurement and device design of left-handed metamaterials
… are conducted to verify the presence of a negative index of refraction. Transmission through an LHM slab from several incidences is shown to be consistent with theory. A four-port device utilizing the dispersive nature of an LHM prism is designed and measured. The measurements show that the …
-
The impact of television viewing on young adults' stereotypes towards Hispanic Americans
… Regression analysis revealed that the Hispanic negative index is highly positively correlated with White Americans who perceive that they learn about other races from watching TV and positively correlated with White Americans who identify with many TV portrayals. Regression analysis also …
-
Materials and strategies for flexible, stretchable and large area photonic devices
… is fabricating flexible, large area, multilayerd negative index metamaterials which are unattainable with conventional fabrication techniques and have high figure of merit in the visible range of operation. Optical modeling by finite domain time domain simulations will be incorporated to achieve …
-
Women Empowerment and socioeconomic inequality in immunization coverage: a case study of Zambia
… coverage. Briefly, a positive concentration index means that immunisation coverage is pro-rich as richer children are more likely to be immunised. A negative index indicates the opposite. The main finding of this study was that socioeconomic status has a significant impact on the immunisation …
-
Identifying Optimal Mixing Strategies and Structures through Sobolev Norms
… measures, equivalent to Sobolev norms of negative index, have been employed successfully for this purpose. This thesis investigates these norms and their use in nonlinear optimal mixing problems. In Chapter 3, we compare the optimisation of the classical variance measure of mixing with …
-
Terahertz response of microfluidic-jetted fabricated 3D flexible metamaterials
Conventional materials exhibit some restrictions on their electromagnetic properties. Especially in terahertz region, for example, materials that exhibit magnetic response are far less common in nature than materials that exhibit electric response. However, materials can be designed, namely …
-
Double Negative Metamaterials in Dielectric Waveguide Configurations
With the recent resurgence of interest in double negative (DNG) materials and the reported construction of a metamaterial with DNG characteristics, applications of these materials become feasible and examination of the behavior of systems and devices a potentially fruitful topic. The most promising …