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.
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Showing 1 to 20 of 39 for “"Metallic nanostructures"”.
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Fabrication of metallic nanostructures from sputtered nanocluster precursors
This thesis studies the morphological and electrical properties of copper nanocluster devices generated by DC magnetron sputtering and annealed at temperatures up to 1100 C. At each annealing step, the resistivity of the cluster device was measured and electron micrographs were taken of the cluster …
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Transport phenomena in metallic nanostructures: an ab initio approach
Im Rahmen der vorliegenden Arbeit werden ab initio Berechnungen des Restwiderstandes von metallischen Nanostrukturen vorgestellt. Die elektronische Struktur der idealen Systeme wird mit Hilfe einer Screened KKR Greenschen Funktionsmethode im Rahmen der Vielfachstreutheorie auf der Grundlage der …
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Non-metallic nanostructures for light-driven chemistry and catalysis
… materials, coinage metal (Au, Ag, Cu) nanostructures display a remarkable phenomenon: under excitation by visible wavelengths of light, their free electrons undergo collective oscillations known as localized surface plasmon resonance (LSPR) oscillations. This effect has been harnessed …
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Rational Design and Advanced Fabrication of Metallic Nanostructures for Surface-Enhanced Raman Spectroscopy
… of the interaction between an optical field and metallic nanostructures to magnify the electromagnetic field in the vicinity of the nanostructure, resulting in an amplified signal of the vibrational fingerprints of the adsorbed molecules onto the metallic surface. In this Thesis, the rational …
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TOWARD ENHANCED BIMODAL SENSING: TIO₂-COATED METALLIC NANOSTRUCTURES FOR ELECTROCHEMICAL ANDPHOTOELECTROCHEMICAL DETECTION
… The aim was to evaluate the influence of metal nanostructures on the behavior of the material. It emerged that TiO2 plays a crucial role in stabilizing the nanoparticles: in the absence of the oxide layer, the AuNPs show poor adhesion and rapid dissolution, while the TiO2 coating preserves their …
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Quantum Plasmonics: A first-principles investigation of metallic nanostructures and their optical properties
… electronic structure and optical properties of metallic nanoparticles are theoretically investigated front first principles. An efficient implementation of time-dependent density functional theory allows a fully quantum mechanical description of systems large enough to display collective …
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LASER SHOCK IMPRINTING OF METALLIC NANOSTRUCTURES AND SHOCK PROCESSING OF LOW-DIMENSIONAL MATERIALS
… for fabricating and tuning of plasmonic nanostructures, and processing of one-dimensional semiconductor nanowires and two-dimensional crystals. The technique utilizes a shock pressure generated by laser ablation of sacrificial materials. Compared with conventional technologies, LSI …
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Atomistic Molecular Dynamics Studies of Grain Boundary Structure and Deformation Response in Metallic Nanostructures
… response of grain boundaries in polycrystalline metallic nanostructures to applied strain using molecular dynamics simulations and empirical interatomic force laws. The specific goals of the work include establishing how local grain boundary structure affects deformation behavior through the …
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Design and characterization of surface-enhanced Raman scattering nanoparticles as spectroscopic probes for biological imaging
… and the optical properties of the probe. Metallic nanostructures consisting of noble metals such as gold and silver were investigated as probes because they provide intense surface-enhancement effects and the ability to tune their optical properties as desired. In particular, gold …
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Simulation methods for plasmonic structures
… at the nanoscale. The interaction of light with metallic nanostructures produces a collective excitation of conduction electrons at the metal surface, also known as surface plasmons. These plasmonic resonances enable an unprecedented control of light by confining the electromagnetic field to …
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Solid-state superionic stamping: Patterning 3D metallic micro- and nanostructures for surface enhanced Raman sensing
Metallic nanostructures play a pivotal role in micro- and nanotechnology, contributing to various applications such as interconnects in electronics; electrodes in chemical sensors, batteries, fuel cells, antennae, plasmonic waveguides in sub-wavelength optics; etc. As the demand for functional …
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Dynamic control of plasmonic resonances with graphene based nanostructures
<p>Light incident on a metallic structure excites collective oscillations of electrons termed as plasmons. These plasmons are useful in control and manipulation of information in nanoscale dimensions and at high operating frequencies. Hence, the field of plasmonics opens up the possibility of …
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Study of optical propulsion concepts and techniques for small-satellites
… the characteristics and use of asymmetric, metallic, nanostructures for plasmonic force propulsion, a developing method of nano-/picosatellite thrust generation. This project developed a higher-fidelity model of a recently envisioned small spacecraft propulsion system for precision pointing …
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Solid state electrochemical processes for nanofabrication
Metallic nanostructures play a defining role in micro and nanotechnology, from interconnects in electronics to electrodes in chemical sensors, batteries, fuel-cells, antennae, plasmonic waveguides in sub-wavelength optics and structural color generation. While the demand for making functional …
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Engineered Plasmonic Nanostructures for Infrared Spectroscopy, Refractive Index Sensing and Nonlinear Optics
… interaction in metal nanoparticles and nanostructures – has been the topic of intense research activities for many years. Early researchers studied the dependence of plasmon resonance frequency on the size, shape and dielectric environment of the nanoscale system, mainly for sensing …
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Plasmon hybridization in real metals
By treating free electrons in metallic nanostructures as incompressible and irrotational fluid, Plasmon hybridization (PH) method can be used as a very useful tool in interpolating the electric magnetic behaviors of complex metallic nanostructures. Using PH theory and Finite Element Method (FENI), …
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Loss compensation in a plasmonic nanoparticle array
… of a gain material in close proximity to the metallic nanostructures for loss compensation. Here the physics of light transport in a nanoparticle array, and the operation of gain media in contact with the structure, are described and analytically modeled. A two-dimensional array of closely …
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Extraordinary light-induced local field, angular momentum and force near metallic nanoparticles
The intense local field induced near metallic nanostructures provides strong enhancements for surface enhanced spectroscopies, a major focus of plasmonics research over the past decade. Here we show several different nanoantennas for SEIRA detection, which exhibit an order of magnitude greater …
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Large area plasmonic nanostructures design, fabrication and characterization by laser
… interactions can be effectively confined in metallic nanostructures. The intense electromagnetic fields by free electron oscillations at the metal surface provide promising applications, of which plasmonic sensing is a prime example. However, the development of practical, low-cost nanoscale …
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