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 22 for “"crystal films"”.
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Liquid crystal films confined between patterned substrates.
In this thesis, systems of nematic liquid crystals confined between patterned substrates have been studied using molecular computer simulation. The aim of this work, done in parallel with experimentalists in Leeds, has been to investigate the use of chemical patterning as a novel method for …
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Nanoparticle Superlattice Processing: Monodispersed Building-Blocks & Single Crystal Films
… to produce superlattices with controlled crystalline structures, lattice spacing, and geometries. These superlattices have potential applications in photonics, plasmonics, and microfluidicfluidics. While NCTs can be produced in bulk scale, processing these materials into useful devices …
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Electric field controlled optical scattering in nematic liquid crystal films.
Thesis. 1975. B.S. cn--Massachusetts Institute of Technology. Dept. of Electrical Engineering and Computer Science.
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Integrated Growth and Process Technology for Atomically Thin Single Crystal Films
… the average characteristics of a large graphene films suitable for scalable fabrication/manufacturing methods. Graphene films deposited by chemical vapour deposition hold the most promise to exploit the unique properties on industrial scales, yielding mobilities approaching that of the current …
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Pulsed laser deposition of thick multilayer garnet crystal films for waveguide laser devices
… (PLD) to fabricate thick multilayered garnet crystal planar waveguides with rare-earth ion doped cores for use as planar waveguide laser devices. Planar waveguides are of interest because of the implications of their structure, which allows for lasing, pumping and heat dissipation to each have …
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Study of phenomenologies during templated solid-state dewetting of thin single crystal films
Generally, thin films are away from equilibrium in the as-deposited state and will agglomerate, or dewet, to form islands given sufficient atomic mobility. This dewetting process can occur in the solid state, well below the films' melting temperature. Dewetting initiates from film-substrate- vapor …
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Quantitative analysis of anisotropic edge retraction during solid-state dewetting of thin single crystal films
In the as-deposited state, thin films are generally far from equilibrium and will agglomerate or dewet to form arrays of islands when sufficient atomic motion is allowed. Dewetting can occur well below the films' melting temperature in the solid-state. The dewetting process begins by formation and …
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Solid-state dewetting of continuous and patterned single crystal Ni thin films
Solid-state dewetting of thin films is a process through which continuous solid films agglomerate to form islands. This process is driven by capillary forces, often occurring via surface self-diffusion. Solid-state dewetting of single crystal films has the potential to produce a wide range of …
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Organic materials for second-order nonlinear optics: Approaches to optimizing and stabilizing nonlinear optical effects
… dyes, two-dimensional polymers, and novel single crystal films that exhibit zero-field SHG.
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Growth and Characterization of Polycrystalline Rare-Earth Iron Garnet Films and Heterostructures
… robust, and faster microelectronic devices. Thin films of rare-earth iron garnets, a class of insulating ferrimagnetic oxides, are particularly well suited to this application as the anisotropy, magnetization, magnetostriction, and damping can be easily controlled through selection of rare-earth …
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Modeling nonlinear material behavior at the nano and macro scales
… The nonlinear indentation response of Ni thin films of thicknesses in the nano scale was studied using molecular dynamics simulations with embedded atom method (EAM) interatomic potentials. The study included both single crystal films and films containing low angle grain boundaries …
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Nucleation and Growth of Order in Cu(3)Au (111) Films
… epitaxial growth of (111) face-centered cubic crystal films, such as disordered $\rm Cu\sb3Au,$ there are two possible ways that successive layers can be laid down, leading to two types of stacking domains. However, a small vicinal miscut $(0.5\sp\circ {-}1\sp\circ )$ of the crystal surface …
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Mesoscopic noise probe of an inhomogeneous colossal magnetoresistance phase
Epitaxial single-crystal films of La2; 3Ca1; 3Mn03 exhibit large discrete equilibrium resistance fluctuations in the region of phase space where colossal magnetoresistance effects are strongest. The fluctuators' dependence on magnetic field indicates that the resistance steps represent small …
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Growth and magnetoelastic behavior of b-axis-oriented dysprosium
… is ideally suited for investigation with thin films, in which single crystal films of high quality can be prepared on substrates which cause their lattice parameters to differ from bulk values (strain) and which constrain the strictions which may occur (clamping). The present research describes …
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Growth and Characterization of (InGa)2O3 Alloys
… of the properties of In2O3 and Ga2O3 thin films, there is a need to develop an understanding of the structure and behavior of alloys composed of these metal oxides. This research demonstrates the growth of the cubic form of (InxGa1-x)2O3 for x = 0.6, 0.8, and 1.0 on sapphire (0001) …
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{112} Polar Surfaces of Copper(indium,gallium)selenide: Properties and Effects on Crystal Growth
… work studies the epitaxial growth of CIGS single crystal films on GaAs substrates of various orientations and characterizes the properties of the thin films. A surprising finding is the strong tendency of film surfaces to facet to {112} planes. The work attempted to establish the connections …
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Raman scattering in heavy rare earth metals
… spectra were measured in MBE grown single crystal films of Dysprosium, Erbium and yttrium. In order to measure the weak Raman signals of metals a single grating monochromator was designed and constructed and added to an existing double grating monochromator to improve the stray light …
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Brillouin scattering from opaque semiconducting alloys and thin films
… spectra were measured in MBE grown single crystal films of A1xGal_xAs alloys and AlxGal_xAs -GaAs supedattices on GaAs substrates, and GaAs films grown on miscut Si substrates. To detect the Brillouin shifted light against the strong elastic background present in opaque materials, a tandem …
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Multi-Scale Assembly Methodologies of Poly(3-Hexylthiophene) Derivative Systems for Enhanced Optoelectronic Anisotropy
… both systems form lyotropic liquid crystalline phases. Characteristics of the liquid crystalline phases are found to be heavily influenced by dilute solution self-assembly mechanisms and processing. Through the application of a mechanical shear force along still-wet liquid crystal …
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Evaporation-Driven Assembly as a Route to Photonic Materials
… diffraction properties of photonic crystals have inspired their proposed use in applications ranging from chemosensors, to solar power applications, to optical computing devices. The range of proposed applications for photonic crystals demands a range of techniques for fabricating …
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