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 109 for “"Optical Materials"”.
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High throughput optical materials
… silica and sodium hydroxide solution as starting materials was explored using hydrothermal methods (200°C), and reactions conditions were optimised for the formation of analcime, sodalite, zeolite A and faujasite. All materials were characterised using powder x-ray diffraction.<br/>The thermal …
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New optical materials containing isobenzofuran
… of isobenzofuran subunits into conjugated optical materials. We discuss the properties of isobenzofuran, its role in organic chemistry, and the synthesis of isobenzofuran containing materials in the context of the other well known benzo[c]heterocycle, isothianaphthene. Isothianaphthene has …
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Novel Optical Materials for Passive Photonic Applications
Advances in photonic materials are critical to the progress of photonic devices and optical systems. Even though a variety of materials, e.g. semiconductors, oxide based glasses, and polymers exist which are being used for numerous applications, there is a growing need to develop and find new …
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Porphyrins as second order nonlinear optical materials
… evaluation of porphyrins as $\chi\sp{(2)}$ materials. Class I explored the effects of the number of donor-acceptor groups on the porphyrin periphery (i.e., H$\rm\sb2(an\sb3P), H\sb2$(cis-a$\rm\sb2n\sb2$P), H$\rm\sb2(a\sb3$nP), H$\rm\sb2(a\sb4$P) where a = 4-(N-octadecylamido)phenyl or …
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Creation of 3-dimensional micro-optical materials
… the wavelength of light can greatly modify the optical properties of materials. Control over these aspects can introduce a variety of optical phenomena, such as photonic band gaps, negative refractive index, transformation optics, and sub-diffraction limit focusing, to name a few. These …
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Molecular Engineering of Dipolar and Octupolar Non-Linear Optical Materials for Next-Generation Telecommunications
In an age where next-generation all-optical circuitry and optical data storage are at the forefront of the telecommunications industry, the molecular engineering and design of new organic materials continues apace. Such materials are particularly attractive on account of their fast optical response …
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The synthesis of novel porphyrin macrocycles for their use as potential non-linear optical materials
… compounds exhibit for the use as nonlinear optical materials, has received a lot of attention recently. Aromatic compounds containing extensive delocalised π-electronic systems are of particular interest. Porphyrins and metalloporphyrins contain an extensive delocalised 7t-electron system …
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Accelerating Materials Discovery for Optical Applications using Machine Learning, Natural Language Processing and Density Functional Theory
… thesis presents a novel approach that combines materials informatics and theoretical calculations to accelerate the discovery of materials with desirable optical properties. Unlike traditional experimental research programmes, this work emphasises the significant contributions in terms of …
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Ion Beam Synthesis and Irradiation for Si-Based Photonic Materials and Nuclear Waste Management
… synthesis and interactions of radiation with materials using ion beam techniques, with applications in Si photonics and in nuclear waste management. Advances in electronics and telecommunications drive the need for Si-based optical materials (group IV alloys) with tunable bandgaps, and for …
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Orders of Magnitude Enhancement of Optical Nonlinear Phenomena in Subwavelength Metal-Dielectric Gratings
Nonlinear optical materials give rise to a multitude of phenomena that have important applications in technology and science. Due to small nonlinearities in naturally occurring materials, large optical fields are necessary to realize measurable nonlinear phenomena. The necessity of high intensity …
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Light conversion processes in lanthanide-based molecular materials
… of efficient near infrared (NIR)-emitting materials. In the light of a detailed understanding of the chemical/photophysical properties of the special class of lanthanide quinolinolato complexes, as prototype molecular materials for NIR applications, two main aspects have been taken into …
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Modified chalcogenide glasses for optical device applications
… examined and their potential for use as active optical materials is explored. It is also argued that the spectroscopic analysis of transition metal ions is a useful tool for evaluating the local environment of their host. Secondly femtosecond (fs) laser modification of GLS is investigated as a …
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Synthesis, Characterization, Properties and Computational Studies of Linear Boronate Diester-Linked Materials
Boronate-containing materials have been extensively investigated in the recent decade because these compounds combine the advantages of dynamic reversibility to afford error checking mechanisms during synthesis and enhanced stability compared to conventional supramolecular polymers. Herein, we …
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Self-Assembled Multilayered Dielectric Spectral Filters
Thin film optical filters are made by depositing thin films of optical materials on a substrate in such a way as to produce the required optical and mechanical properties. The Electrostatic Self Assembly (ESA) process is accomplished by the alternate adsorption of poly-anionic and poly-cationic …
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Sputtering fabrication of silicon nitride and silicon oxide based dichroic mirrors
Thin films in optical materials utilize the properties of multiple materials to obtain specific and fine-tuned transmission, absorption and reflectance at wavelengths. Dichroic mirrors exhibit very different reflectance and transmission rates at certain cut-off wavelengths, which can be adjusted …
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Halo-fosfatų 31P, 1H ir 35Cl kietojo kūno BMR tyrimas /
Calcium phosphates (CaPs) are a family of materials used for various applications such as bone regeneration, catalysis, 3D printing, development of optical materials, etc [1]. Properties such as bioactivity, biocompatibility and osteoconductivity are necessary for CaPs in bioapplications [1, 3]. …
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New Organic/inorganic Hybrid Sol-gel Nanocomposite Materials For Raman Gain In Fiber Optics
… 1300-1600 nm has generated an interest in new optical materials and devices that can operate outside the normally used regions of 840 nm, 1310 nm, and 1550 nm. Specifically, methods to amplify fiber optical data transmission in the regions where there is limited or no existing methods to …
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Gain effect waveguide optical amplifiers for Si microphotonics
… high index difference ([delta]n=0.1-0.7) Er host materials. Samples were grown by sputtering, and we investigated the optical materials quality of this process by studying sputtered SiO₂:Er; we report a record co-sputtered SiO₂:Er room temperature lifetime of 14 ms. PL versus heat treatment …
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Utilisation of Cellulose Nanocrystals for the Fabrication of Photonic Materials
… with periodic nanostructures. The same striking optical response can be obtained artificially by structuring materials on the same length scale. As an example, naturally derived cellulose nanocrystals (CNCs) can be self-assembled to form a helicoidal nanostructured film that displays vivid …
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