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 “"Visible wavelength"”.
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Short-visible-wavelength GHz Display
… channels at blue and ultraviolet wavelengths by combining an integrated photonic modulator array with a strong pump beam for sum-frequency generation in a bulk nonlinear crystal. We realize a 4x4 array of amplitude-modulated spots at 420nm with a 3dB bandwidth of 2GHz.
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Demonstration of the First Visible Wavelength Direct Nuclear Pumped Laser
Made available in DSpace on 2014-12-14T06:25:59Z (GMT). No. of bitstreams: 1 7708913.pdf: 2428407 bytes, checksum: 8ac775c2af2f643ffbb8a5fe6685e6e1 (MD5) Previous issue date: 1976
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Enhance of LCOS Phase Modulation in Visible Wavelength Range Based on Metasurface
… in which a metasurface (composed of a subwavelength TiO₂ nanopillar array with a size gradient) partially transfers the phase depth modulation requirements from the liquid crystal layer. The design exploits the electrically controlled birefringence (ECB) mode for continuous tuning of the …
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First Visible Wavelength Lightcurves for the Northern Hemispheres of Titania and Oberon
… hemispheres. In this work, I present the first visible-wavelength lightcurves of the northern hemispheres of Titania and Oberon. Observations of the Uranian satellites are inherently difficult given their proximity to Uranus. Contamination from stray Uranian light is a major challenge and the …
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Multi-dimensional computational imaging from diffraction intensity using deep neural networks
… pure-phase) objects, e.g. biological cells under visible-wavelength light or integrated circuits under X-rays, with proper exploitation of the phenomenon. However, cameras only measure the intensity of the diffracted light, which makes the camera measurements incomplete due to the loss of phase …
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Dissociation of carbon dioxide in atmospheric pressure microchannel plasma devices
… dioxide were observed in emission spectra of visible wavelength range measured through a transparent dielectric coated with ITO electrode. Quantitative analysis by mass spectrometry derived the conversion rate of 2.40 ± 0.1 % and the energy efficiency of ~15 %. These results can be improved by …
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Visible spectrometer utilizing organic thin film absorption
… I modeled and developed a spectrometer for the visible wavelength spectrum, based on absorption characteristics of organic thin films. The device uses fundamental principles of linear algebra to reconstruct spectral components of a signal from the transmission through an organic thin film. Best …
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III-nitride nanowire light-emitting diodes: design and characterization
… (LEDs) with emission in the ultraviolet to visible wavelength range have recently been studied for applications in solid-state lighting, flat-panel displays, and solar-blind detectors. In this thesis, investigation of the systematic process flow of design and epitaxial growth of group …
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Optothermal Characterization of Nanoparticle Infused Aerogels
… (MIR) while maintaining high transmission in the visible wavelength region. Importantly, the results show that nanoparticle infusion can be used as a flexible method to tailor the opto-thermal properties of aerogels.
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Fiber-taper collected photoluminescence characterization of diamond microdisks
… apparatus integrating free space and visible wavelength fiber-taper measurement capabilities is built to characterize diamond microdisk resonators. Using this setup, microdisk wisphering gallery modes with quality factors at visible wavelengths resonant with defect centers as high as Q …
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One and two photon absorption of atoms and ions
… parametric oscillator (OPO), tuneable in the visible wavelength range (410-700 nm), to permit two-photon and two-colour photoabsorption investigations. The OPO was tuned to one and two photon resonances in Sr0 and Sr+ and the XUV photoabsorption spectrum was studied for various laser …
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Vejos mišinio lapų atspindžių matomoje ir artimojoje infraraudonoje šviesoje tyrimas /
… reflection of sward mixture leaves in visible and near infrared wavelengths, when plants grow in different condition (water stress and watering with solutions of different concentration of KNO3 nutrients). The reflection of leaves was measured using photo-electronic registration system …
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Starbursts in the UV bright interacting galaxies NGC 3395 and NGC 3396
We have obtained ultraviolet and visible wavelength images for the interacting galaxies, NGC 3395/6, using the Space Telescope Imaging Spectrograph (STIS) on Hubble Space Telescope (HST). The images show many isolated sources of ultraviolet emission which are young star forming regions with ages …
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Mapping exoplanet clouds and albedo from phase curves and spectra
… albedo models to investigate variations in visible wavelength phase curves of exoplanets. We improve upon existing exoplanet giant planet albedo models and incorporate exoplanet general circulation models to analyze the composition and occurrence of clouds on tidally locked exoplanets. We …
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Imaging of bromine oxide and formaldehyde using Fabry-Perot interferometer correlation spectroscopy
Imaging of atmospheric trace gases in the UV and visible wavelength range provides insights into the spatial distribution of physical and chemical processes in the atmosphere. This is of particular advantage when observing fast-emitting point sources such as volcanoes. For this purpose, instruments …
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Functional nanostructured plasmonic materials: fabrication, simulation, imaging and sensing applications
… with precisely controlled arrays of subwavelength metal nanostructures provide a promising platform for the sensing and imaging of surface binding events with micrometer spatial resolution over large areas. Soft lithography, one family of unconventional nanofabrication methods, provides …
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Photoelectromechanical synthesis of low-cost DNA microarrays
… it employs standard phosphoramidite reagents, visible wavelength optics, and a cheaply microfabricated and reusable substrate. By incorporating a porous thin-film glass that dramatically increases the DNA quantity produced by over an order of magnitude per chip, this platform may also simplify …
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A Matrix Isolation Spectroscopic Investigation Into the Reaction Products of Vanadium Metal Atoms With Propene
… of matrices with several different UV-visible wavelength ranges indicate that no further chemistry occurs after formation of the matrix and further irradiation has no effect on intermediates or reactants. Additionally the reactivity of water with vanadium and propene under low propene …
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Guided -Mode Resonance in Planar Photonic Crystals: Application to Sensing
… bulk sensitivity for devices operating in this wavelength range. The application of PCs for wavelength detection is demonstrated by developing a system employing a continuously variable reflectance filter. The system is composed of only two components and allows detection of wavelength changes …
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Characterisation of Microphysical and Optical Properties of Atmospheric Aerosols in a High Arctic environment: Villum Research Station, NE Greenland
… properties, which control their interaction with visible wavelength radiation. This thesis focuses on the characterisation of the aforementioned aerosol properties in a High Arctic environment, Villum Research Station (Northeast Greenland), during two six-month observation periods in 2020 and …
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