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 137 for “"Light-Emission"”.
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Light Emission from Zinc Oxide Nanoforest Plasma
… with high intensity arcs of characteristic blue light. Easy and reproducible plasma formation is obtained on patterned microstructures of highly doped silicon. Both DC stress and AC stress with variable frequency were applied (up to 10 KHz) as well as short duration pulses (from 1 to 100 μs) to …
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Controlling light emission with shaped electron wavefunctions
… which can one change the nature of spontaneous emission from a free electron by shaping the its wavefunction has been a long-standing question. In this work, we use both a semi-classical formalism and a QED formalism to show that Bremsstrahlung radiation can be tailored by altering the electron …
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Semiconductor quantum dots for mid-IR light emission
… this thesis gives an introduction to why mid-IR light is important and the state-of-the-art mid-IR sources. We discuss the working theory, structure, advantages and disadvantages of quantum cascade laser (QCL), interband cascade laser and type-I quantum well lasers, which together cover the …
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Visible light emission from Eu-containing Si-based materials
… are characterized by a very intense and broad emission band, tunable in all the visible range, which can be of interest for many technological fields, while Eu3+ ions present less intense and sharp emission peaks at arround 600 nm. In this thesis, two different approaches able to take advantage …
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Light Emission and Charge Transport in Reverse Biased Polymer Junctions
… devices. Among organic electronic devices, light-emitting electrochemical cells (LECs) are unique in that they possess a true p-n junction formed by in situ electrochemical doping reactions. Similar to an inorganic p-n junction LED in many aspects, LECs have some very desirable device …
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Intentional and Unintentional Light Emission Diode in Power Electronics applications
The phenomenon of light emission in a P-N junction is due to the recombination of electrons and holes in the junction. This light emission phenomenon has been widely used in power electronics applications. Among them, it is worth remembering the use of the light-emitting diode (LED) as a source of …
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Electronic structure and light emission from erbium centers in silicon
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1995.
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Light emission and current instabilities in transistor-injected quantum cascade structures
Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2025-08-01
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Erbium-ytterbium-yttrium compounds for light emission at 1.54[mu]m
Silicon microphotonics has emerged as the leading technology to overcome the interconnect bottleneck that limits a further increase of computation power following Moore's law. Optical interconnects between different electronic microprocessors in an electronic-photonic integrated circuit (EPIC) can …
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Efficient light emission from bismuth-doped rare earths compounds for Si microphotonics
… there is still a lack of integrated infrared light sources that are required to generate logic value 1-0 and to compensate the optical losses in waveguides. In addition recently also the demand for efficient integrated visible light sources for LEDs, displays and lab-on-chip applications is …
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Self-assembled strained nanostructures for light emission grown using molecular beam epitaxy
… for applications in dislocation-resistant light emitters for photonic integrated circuits, quantum computing and single photon emitters. The 0D nanostructures include quantum dots (QDs), dot in a well (DWELLs), sub-monolayer QDs and droplet epitaxy QDs, while 1D elongated structures include …
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Predictive simulation and design of III-V heterostructures for light emission and detection
… particularly in photonic devices such as light-emitting diodes (LEDs) and lasers, in addition to photodetectors and optical amplifiers. Predictive simulations are key to support the development of these technologies. In this Thesis we employ both first-principles and continuum empirical - …
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Optical bound states in the radiation continuum : from topological charges to light-emission applications
… unusual solutions of wave equations describing light or matter: they are discrete and spatially bounded, but exist at the same energy as a continuum of states which propagate to infinity. In this thesis, we will explore optical BICs from different perspectives, including physical intuitions, …
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An investigation into the characteristics and sources of light emission at deep-sea hydrothermal vents
A spectral camera (ALISS - Ambient Light Imaging and Spectral System) was used to image ambient light from high-temperature vents at 9°N East Pacific Rise and the Juan de Fuca Ridge during 1997 and 1998 Alvin dive cruises. ALISS is a low-light digital camera with custom-designed optics. A set of …
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An investigation into the characteristics and sources of light emission at deep-sea hydrothermal vents
A spectral camera (ALISS - Ambient Light Imaging and Spectral System) was used to image ambient light from high-temperature vents at 9°N East Pacific Rise and the Juan de Fuca Ridge during 1997 and 1998 Alvin dive cruises. ALISS is a low-light digital camera with custom-designed optics. A set of …
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Theory for strongly coupled quantum dot cavity quantum electrodynamics - Photon statistics and phonon signatures in quantum light emission
Aktuelle Fortschritte in der Halbleitertechnologie etablieren ein neues physikalisches System, um quantenoptische Eigenschaften auf Nanoskalen zu untersuchen: ein Quantenpunkt in einem Mikroresonator. Im Falle einer starken Kopplung übertrifft die Stärke der Elektron-Licht Wechselwirkung die …
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Material Characterization, Patterning and Adsorbate Induced Modulation of Light Emission of Porous Silicon Produced by Metal -Assisted Electroless Etching
… (PSi). Upon ultraviolet excitation, the peak emission wavelength of PSi can be tuned in the visible spectral range simply by varying the etching conditions. Photoluminescence measurements reveal the spectral and spatial characteristics of the light emission as a function of processing …
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Enhanced chemiluminescent immunoassay for staphylococcal enterotoxin B in foods
… mixture resulted in $>$2,000 fold increase in light emission over the unenhanced reaction. Furthermore, light emission was not only of high intensity but also of prolonged duration. This simplified manipulation since it was not necessary to start the reaction in front of the photodetector.
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Electroluminescence in ion gel gated organic polymer semiconductor transistors
This thesis reports the light emission in ion gel gated, thin film organic semiconductor transistors and investigates the light emission mechanism behind these devices. We report that ion gel gated organic polymer semiconductor transistors emit light when the drain source voltage is swept slightly …
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Silicon rich nitride for silicon based laser devices
Silicon based light sources, especially laser devices, are the key components required to achieve a complete integrated silicon photonics system. However, the fundamental physical limitation of the silicon material as light emitter and the limited understanding of tli~ excitation mechanism of Er in …
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