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 20 of 263 for “"metamaterials"”.
-
Discrete mechanical metamaterials
Digital fabrication enables complex designs to be realized with improved speed, precision, and cost compared to manual techniques. Additive manufacturing, for example, is one of the leading methods for rapid prototyping and near net shape part production. Extension to full scale structures and …
-
Design of elastic metamaterials
… and three broadband single negativity elastic metamaterials using a 3D printer. We investigated dispersion curves and dynamic material properties of the metamaterials. Negative phase velocity in the double negativity metamaterial was also demonstrated.</p> <p>For metamaterials with single …
-
Metamaterials for Computational Imaging
<p>Metamaterials extend the design space, flexibility, and control of optical material systems and so yield fundamentally new computational imaging systems. A computational imaging system relies heavily on the design of measurement modes. Metamaterials provide a great deal of control over the …
-
Origami-inspired mechanical metamaterials
Origami-inspired mechanical metamaterials are recognised for their diverse property tuneability and controllable collapse behaviours, but their performances are often limited by the flat foldable unit cells. This thesis introduces a novel concept of heterogeneous origami-inspired mechanical …
-
Acoustic Metamaterials at the Microscale
… dictated by the characteristic dimensions of the metamaterials, while local resonance remains wavelength-independent. Therefore, micro-architected materials have the potential to allow control of mechanical waves both at high (MHz) and medium-range (kHz) frequencies. Here, we design, fabricate, …
-
Uniaxial optical phase change metamaterials
Optical metamaterials are artificially engineered materials with exceptional electromagnetic properties that cannot be found in nature. Over the last 20 years, optical metamaterials have driven forward a plethora of fields from telecommunications to solar energy harvesting. They owe their unique …
-
DESIGNING MECHANICAL METAMATERIALS FOR INDUSTRIAL APPLICATIONS
… optimizing, and manufacturing mechanical metamaterials for industrial applications. Building upon recent theoretical advances in mechanical metamaterials—structures that derive their properties from geometric design rather than chemical composition—the research bridges the gap between …
-
Terahertz metamaterials for sensing and detection
The function of metamaterials targeted for operation at terahertz frequencies was investigated including split-ring resonators, perfect absorbers, and flexible absorbers. The devices were designed through simulation by finite element method commercial software and fabricated by photolithographic …
-
Active and Fast Tunable Plasmonic Metamaterials
Active and Fast Tunable Plasmonic Metamaterials is a research development that has contributed to studying the interaction between light and matter, specifically focusing on the interaction between the electromagnetic field and free electrons in metals. This interaction can be stimulated by the …
-
Split Ring Resonator (SRR) based metamaterials
Abstract Metamaterials are artificial materials that are known to produce extraordinary electromagnetic responses due to their constituent artificially-engineered micro- or nanostructures of dimensions smaller than that of the wavelength of light. The Split ring resonator (SRR) is such a …
-
Optical Metamaterials: Design, Characterization and Applications
… a phenomenon associated with plasmonic metamaterials, leading to subdiffraction resolution with optical imaging. Fabricating a smooth silver superlens (0.6nm root mean square roughness) with 15nm thickness, I demonstrate 30nm imaging resolution or 1/12th of the illumination wavelength …
-
Computational Design of 2D-Mechanical Metamaterials
Mechanical metamaterials are novel materials that display unique properties from their underlying microstructure topology rather than the constituent material they are made from. Their effective properties displayed at macroscale depend on the design of their microstructural topology. In this work, …
-
Simulation of Simultaneously Negative Medium Metamaterials
Metamaterials are artificial materials and named by those who work in the microwave material area. According to existing documentation, the metamaterials have relative permittivity and/or relative permeability of values less than 1, including negative values. If the material has negative …
-
Microwave Metamaterials for Compact Filters and Antennas
In dieser Arbeit werden die grundlegenden Eigenschaften negativer Permeabilität, Permittivität und linkshändiger Materialien(LHM) beim Entwurf von Antennen und Filtern als potenzielle Anwendungen in der Mikrowellentechnik erforscht. Bei der Untersuchung grundlegender Eigenschaften und …
-
Acoustic metamaterials : microperforated shell and Helmholtz resonator
[EMBARGOED UNTIL 12/01/2026] Metamaterials have been extensively developed in many areas over the past two decades, a great deal of research has been conducted on acoustic metamaterials exhibiting unusual dynamic effective material properties produced by artificially engineered microstructures. …
-
Resonance and double negative behavior in metamaterials
In this work, a generic class of metamaterials is introduced and is shown to exhibit frequency dependent double negative effective properties. We develop a rigorous method for calculating the frequency intervals where either double negative or double positive effective properties appear and show …
Page 1 of 14