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 27 for “"deep ultraviolet"”.
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Pollutant monitoring with fibre optics in the deep ultraviolet
… on work carried out in the development of ultraviolet fibre-optic based absorption sensor systems, including those with the newly available ultraviolet improved silica fibres having low attenuation in the 200 nm to 250 nm wavelength region. Several approaches to optimize the optical design …
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Quantitative imaging of living cells by deep ultraviolet microscopy
… remain unanswered by current imaging approaches. Deep ultraviolet microscopy received attention in the 1950s as a way to generate image contrast from the strong absorbance of proteins and nucleic acids at wavelengths shorter than 300 nm. However, the lethal effects of these wavelengths limited …
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Measurement of Thermal Impedance of Deep Ultraviolet Light Emitting Diodes
<p>Deep ultraviolet (DUV) light emitting diodes (LEDs) based on group III-Nitrides have numerous potential applications in water and air purification, food sterilization, ultraviolet curing, chemical and biological sensors, and medical instrumentation. However, DUV LEDs, with peak emission …
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Tunable, continuous-wave semiconductor disk lasers with emission in the deep ultraviolet
… and ultimately first demonstration of a deep ultraviolet, frequency tripled semiconductor disk laser (SDL). The construction of such a laser is described, together with a review of the relevant theory and investigation of the underlying processes in order to improve the system.;SDLs based …
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Analysis of Light Extraction Efficiency Enhancement for Deep Ultraviolet and Visible Light-Emitting Diodes with III-Nitride Micro-Domes
… next generation of lighting technology such as ultraviolet (UV) / visible light-emitting diodes and laser diodes. The limitation occurred in light extraction efficiency of III-nitride LEDs is attributed to the large refractive index difference between III-nitride semiconductor and free space, …
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Wavelength-Resolved Fluorescence Detection in Capillary Electrophoresis: Application to Single -Cell Analysis of Monoamine Neurotransmitters
… as the availability of inexpensive and rugged deep ultraviolet metal vapor lasers, promise to greatly expand the application of LINF detection in CE.
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HIGH POWER ALGAN BASED DEEP UV LED LAMPS: DESIGN, FABRICATION AND CHARACTERIZATION
<p>Deep ultraviolet light sources wavelength ranging from 250 - 365 nm are used in many applications including water/air purification, analytical scientific instrumentation, bio-agent detection systems, and emerging medical instrumentation. Current UV-LEDs are limited in the market penetration due …
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Quantization of spin waves in ferromagnetic Ni80Fe20 nanoring
… permalloy nanorings have been fabricated using deep ultraviolet lithography and their spin dynamicsmeasured by Brillouin light scattering with the magnetic field applied along long (easy) axes of the rings. The dispersionless behavior of the spin wave modes observed reveals their standing wave …
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Reduced Defect Density Nalgan Template Layer for Improved Output Deep-UV LED
<p>This dissertation focuses on improving deep ultraviolet light emitting diodes, by improving the base nAlGaN layer upon which the device layers are grown. The AlN buffer layer, superlattice strain-relieving layer and nAlGaN layer are sequentially and systematically optimized. Rough/Smooth AlN …
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Nanostructures for Coherent Light Sources and Photodetectors
… photons in a broadband spectrum from the deep-ultraviolet to the terahertz region. Graphene can be realized as the next generation broadband photodetection material, especially in the infrared to terahertz region. Here, we have demonstrated high-performance hybrid photodetectors operating …
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Investigation into the molar feeding ratio and temperature dependence on the replacement reaction between platinum ions and silver nanoparticles
… peaks closer to the visible spectrum from the deep ultraviolet region.
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Experimental investigation of the dynamics of S1 benzene and the development of a new UV femtosecond pulse shaper
… state benzene and the development of a new ultraviolet pulse shaper are presented. The non adiabatic non radiative decay process of benzene in its first excited has been determined using pump probe time resolved photoelectron spectroscopy. An ultrafast oscillation has been found at the onset …
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Band Offset Measurements of ε-(InxGa1-x)2O3/AlN using X-ray Photoelectron Spectroscopy
… of advanced electronic applications, such as deep ultraviolet photodetectors, high-electron-mobility transistors, and high-power electronic devices, InGaO/AlN heterojunctions hold significant promise due to their ultra-wide band gap, tunable polarization properties, and optimized spectral …
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Epitaxial growth and characterization of hexagonal boron nitride for deep UV applications
… nitride has attracted a lot of interest in the deep UV community of late. Due to its wide bandgap (~ 6 eV), hBN has a significant potential for deep ultraviolet (DUV) photonic device applications. Additionally, the high neutron capture cross-section of the isotope boron-10 makes hBN a unique …
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Development of Iii-Nitride Non-Polar Leds and Self-Aligned Laser Structure
… design. More specifically we have targeted deep ultraviolet (DUV) LEDs and blue-green light emitting diodes. The epilayer structures for the DUV LEDs are primarily based on high aluminum content AlGaN and that for the blue green comprise of GaN and InGaN. Hence the focus of our thesis is to …
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Packaging designs for ultraviolet light emitting diodes
… Nitride (AlGaN) / Gallium Nitride (GaN) based deep ultraviolet (DUV) light emitting didoes (LEDs) with emission wavelengths between 200-280 nm enable key emerging technologies such as water/air purification and sterilization, covert communications and portable bio-agent detection/identification …
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Optical Properties of Rare-Earth Doped YBO3 Phosphor Materials
… damage threshold, high quantum efficiency in deep ultraviolet region (UV) but this material has a chromaticity problem due to its orange (591 nm, O) and red (611 & 627 nm, R) emission. The red color along with high efficiency is desirable for PDPs and phosphor-based WLEDs applications. In this …
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Investigations of hexagonal boron nitride: bulk crystals and atomically-thin two dimensional layers
… and optical devices such as neutron detectors, ultraviolet light emitters, deep ultraviolet light detectors, and substrates for graphene and other atomically-thin two-dimensional materials. All of these potential applications benefit from high quality, single crystals, with thicknesses varying …
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Protein Biophysics in Hollow-Core Photonic Crystal Fibres: Label-Free Monitoring of Biomolecules in Optofluidic Waveguides
… methods for their study are fundamental to deepening our under- standing of biology and the life sciences. When studying protein interactions, we seek new experimental methods that can detect and monitor proteins in solution, at small volumes and low con- centrations. Of particular interest …
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Wide-Bandgap III-Nitride Tunnel Junctions and Novel Approaches towards Improving Optoelectronic Devices
… optoelectronics from the infrared to the deep ultraviolet wavelengths. Low-bandgap, high indium content III-nitride materials are investigated for longer wavelength applications. High indium incorporation into the crystal is achieved via plasma-assisted molecular beam epitaxy (PAMBE) at …
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