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Dissertations / Theses on the topic 'Titanium niobate'

Author: Grafiati

Published: 28 July 2024

Last updated: 31 July 2025

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1

McCoy, Michael Anthony. "Microstructural characterization of titanium : lithium niobate optical waveguides /." The Ohio State University, 1990. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487676847118483.

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2

Gutmann, Emanuel. "Nasschemisch synthetisierte, oxidische Nanomaterialien mit pyroelektrokatalytischen und photokatalytischen Eigenschaften für Anwendungen in der Desinfektionstechnologie." Doctoral thesis, Technische Universitaet Bergakademie Freiberg Universitaetsbibliothek "Georgius Agricola", 2013. http://nbn-resolving.de/urn:nbn:de:bsz:105-qucosa-102099.

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Im Rahmen der vorliegenden Arbeit wurden zwei verschiedene Klassen oxidischer Nanomaterialien nasschemisch synthetisiert und strukturell-morphologisch charakterisiert. Zum einen betrifft dies TiO2-, TiO2/SiO2-, Ag/TiO2- und Pd/TiO2-Sole, welche die photokatalytisch aktive Modifikation Anatas in nanokristalliner Form enthalten und über einen solvothermalen Sol-Gel-Prozess hergestellt werden konnten. Im Hinblick auf eine potentielle Anwendung in der Desinfektionstechnologie und für den Abbau organischer Umweltschadstoffe wurde die photokatalytische Aktivität von Pulvern und Beschichtungen auf Te

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3

Rejm'ankov'a, Petra. "Etude par diffraction et topographie aux rayons X de monocristaux de LiIO3, de KTiOPO4 et de LiNbO3 sous champ électrique." Université Joseph Fourier (Grenoble), 1995. http://www.theses.fr/1995GRE10179.

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Nous avons etudie par topographie aux rayons x, en utilisant principalement le rayonnement synchrotron, des monocristaux sous champ electrique tels que la forme alpha de l'iodate de lithium (-liio#3), l'orthophosphate potassium titanyl (ktp=ktiopo#4) et le niobate de lithium (linbo#3). Ces etudes ont ete menees dans le but d'elucider les mecanismes de formation des gradients de distorsion sous champ. Nous avons observe sur les topographies les effets qui se produisent sur les cristaux de -liio#3 et ktp lorsqu'un champ electrique est applique suivant l'axe c. Les resultats nouveaux, surtout les

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4

Rabelo, Renato Cunha. "Spectral slicing filters in titanium diffused lithium niobate (ti:linbo3)." 2008. http://hdl.handle.net/1969.1/ETD-TAMU-3160.

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A tunable guided-wave optical filter that performs spectral slicing at the 1530nm wavelength regime in Ti:LiNbO3 was proposed and fabricated. It is aimed at minimizing crosstalk between channels in dense wavelength division multiplexing (DWDM) optical network applications. The design utilizes a sparse grating allowing the selection of equally spaced channels in the frequency domain. Between selected channels, equally spaced nulls are also produced. The sparse grating is formed by using N coupling regions with different lengths along the direction of propagation of light in the waveguide, gener

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5

Solmaz, Mehmet E. "Integration of Arsenic Trisulfide and Titanium Diffused Lithium Niobate Waveguides." Thesis, 2010. http://hdl.handle.net/1969.1/ETD-TAMU-2010-05-7864.

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A chalcogenide glass (arsenic-trisulfide, As2S3) optical waveguide is vertically integrated onto titanium-diffused lithium-niobate (Ti:LiNbO3) waveguides to add optical feedback paths and to create more compact optical circuits. Lithium-niobate waveguides are commonly used as building blocks for phase and amplitude modulators in high speed fiber communication networks due to its high electrooptic coefficient and low mode coupling loss to single-mode optical fibers. Although it can easily be modulated using an RF signal to create optical modulators, it lacks the intrinsic trait to create optica

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6

Suh, Jae Woo. "Selectively Erbium Doped Titanium Diffused Optical Waveguide Amplifiers in Lithium Niobate." 2010. http://hdl.handle.net/1969.1/ETD-TAMU-2010-12-8897.

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Selectively erbium (Er) doped titanium (Ti) in-diffused optical waveguide amplifiers on lithium niobate (LiNbO3) substrate have been fabricated and characterized in the wavelength regime around λ = 1.53μm using counter-directional pumping at λP = 1.48μm. LiNbO3 waveguide amplifiers are desirable for providing gain in optical circuit chips through integration with other optical elements on a single substrate. A prerequisite for achieving useful gain rests on the optimization of overlap between the incident guided optical signal mode distribution and the evolving emission from excited Er ions. T

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7

Wang, Ying-Ju, and 王映茹. "Analysis of Titanium Indiffused Lithium Niobate Waveguide Bend with a Low-Index Prism." Thesis, 1998. http://ndltd.ncl.edu.tw/handle/26826644775889044184.

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碩士<br>國立臺灣大學<br>光電工程學研究所<br>86<br>Waveguide bends are elemental components in integrated optical devices. Th e conventional bend angles are usually restricted below 1 degree for the losse s of the bend structures grow rapidly with the increase of the bend angle. Thu s, the devices, with smaller bend angles, are longer in length and need very h igh resolution in processing. To reduce the losses of wide-angle waveguide ben ds is then an important subject for study. The purpose of this work is to improve

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8

Lin, Yi-Chen, and 林奕辰. "Improved Design and Fabrication of Titanium Diffused Lithium Niobate Multimode Interference Power Splitters." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/00784274268725144239.

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碩士<br>國立臺灣大學<br>電子工程學研究所<br>99<br>Two types of improved 1×4 titanium diffused lithium niobate multimode interference (MMI) power splitters are proposed. The first MMI has an interference region of two stages adjusted to enhance an improvement factor. The second one has an interference region with deposited electrodes. The first type MMI power splitter is obtained by an appropriate cutting of the interference region. For performance evaluation of proposed device, an improvement factor is proposed. The two-stage MMI power splitter has a higher transmission of 80.5% and a shorter coupling length

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9

Ke, Tsung-Ying, and 柯聰盈. "Properties of Nano-Sized Metal Oxides - Piezoelectricity of Sodium Niobate Nanowire and Photocatalysis of Titanium Dioxides." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/11764834411621315264.

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10

Snyder, John William. "Infrared to ultraviolet quantum frequency conversion in micron-scale periodically poled titanium-diffused lithium niobate waveguides." Thesis, 2020. https://hdl.handle.net/2144/41036.

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The quantum nature of light at the single photon level allows for unique applications that classical physics neither predicts nor describes. Most notably, appropriate conditions may cause the states of photons with indistinguishable properties to become entangled, enabling novel approaches to quantum computation, secure communications, and metrology. Any operational quantum information network transporting entangled-photon states must establish a high-fidelity link between its distant nodes despite the inherent fragility of entangled states. However, the lack of a universal operating wave

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11

Yun-SyuanLin and 林昀萱. "The effects of titanium and molybdenum substitution on the electric and photoelectric properties of potassium niobate." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/81884629024026058860.

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碩士<br>國立成功大學<br>材料科學及工程學系<br>102<br>The aim of this study was to search for ferroelectric photovoltaic materials. Because ferroelectric materials usually have a very high DC resistivity over 108 ohm-cm, there is a need to increase the mobile carrier concentration in these materials. For such a purpose, KNbO3 was doped with different ions in this study. Polycrystalline samples of KNbO3:M (M=Ti and Mo) were prepared by the solid-state reaction method. X-ray diffraction showed that a pure phase of Ti or Mo doped KNbO3 could be obtained after sintering at 1000 C for 8 and 10 hours, respectively, a

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12

Pan, Feenix Y. "Theoretical study of doubly-diffused titanium diffused lithium niobate (Ti:LiNbO3) waveguides using fourier transform beam propagation method (FFT-BPM)." 1995. http://catalog.hathitrust.org/api/volumes/oclc/35113222.html.

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Thesis (M.S.)--University of Wisconsin--Madison, 1995.<br>Typescript. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 42-59).

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13

Das, Suman. "Synthesis and Investigations of a Few Anode Materials for Alkali-based Rechargeable Batteries." Thesis, 2017. https://etd.iisc.ac.in/handle/2005/4272.

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The present Thesis explores a few novel anode materials for both lithium-ion and sodium-ion rechargeable batteries. A series of layered metal titanium niobates have been synthesised and their electrochemical energy storage properties, ion transport, and reaction mechanisms are studied in detail. Alkali-titanium niobates such as Li-Ti-niobate (and it’s sodium counterpart) store lithium (sodium) via the conventional intercalation mechanism. Detailed experimental and theoretical investigations reveal interesting and non trivial ion transport, which are found to be strongly correlated to the elect

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14

Van, Camp Mackenzie Anne. "Engineered quasi-phase matching for nonlinear quantum optics in waveguides." Thesis, 2017. https://hdl.handle.net/2144/27041.

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Entanglement is the hallmark of quantum mechanics. Quantum entanglement -- putting two or more identical particles into a non-factorable state -- has been leveraged for applications ranging from quantum computation and encryption to high-precision metrology. Entanglement is a practical engineering resource and a tool for sidestepping certain limitations of classical measurement and communication. Engineered nonlinear optical waveguides are an enabling technology for generating entangled photon pairs and manipulating the state of single photons. This dissertation reports on: i) frequency conver

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15

Gutmann, Emanuel. "Nasschemisch synthetisierte, oxidische Nanomaterialien mit pyroelektrokatalytischen und photokatalytischen Eigenschaften für Anwendungen in der Desinfektionstechnologie." Doctoral thesis, 2012. https://tubaf.qucosa.de/id/qucosa%3A22834.

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Im Rahmen der vorliegenden Arbeit wurden zwei verschiedene Klassen oxidischer Nanomaterialien nasschemisch synthetisiert und strukturell-morphologisch charakterisiert. Zum einen betrifft dies TiO2-, TiO2/SiO2-, Ag/TiO2- und Pd/TiO2-Sole, welche die photokatalytisch aktive Modifikation Anatas in nanokristalliner Form enthalten und über einen solvothermalen Sol-Gel-Prozess hergestellt werden konnten. Im Hinblick auf eine potentielle Anwendung in der Desinfektionstechnologie und für den Abbau organischer Umweltschadstoffe wurde die photokatalytische Aktivität von Pulvern und Beschichtungen auf Te

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16

Bechstein, Ralf. "Pristine and Doped Titanium Dioxide Studied by NC-AFM." Doctoral thesis, 2009. https://repositorium.ub.uni-osnabrueck.de/handle/urn:nbn:de:gbv:700-2009020423.

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A commercial non-contact atomic force microscope was improved to achieve utmost resolution on a routine basis. This system was used to study the (110) surface of rutile titanium dioxide. The focus was on understanding contrast formation in terms of tip-sample interaction mechanisms. Moreover, chromium and antimony-doped titanium dioxide was investigated. The implications of transition-metal doping on the surface structure of this highly interesting photocatalyst was studied at the atomic scale.

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