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 425 for “"emitters"”.
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Multiphoton correlations and emitters
The characterisation of the quantum states of light and their subsequent realisation is thought to be an indispensable step to bring in quantum technologies to the real world. The emergence of quantum cryptography, quantum security protocols or quantum computers, among others, demand implicitly or …
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Synthetic Design of Optical Emitters
… of future technologies on the horizon. Colloidal emitters, such as quantum dots (QDs) and small molecules, act as chemical platforms with extraordinary capabilities in shaping light-matter interactions. Yet, the stringent requirements placed on these species by increasingly sophisticated …
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Resonance fluorescence of novel quantum emitters
Quantum dots (QD) emitting near the telecommunication O-band and excitons believed to be localized on defects in WSe2 monolayers are investigated using optical spectroscopy and resonance fluorescence (RF). The development of light sources emitting around 1300 nm is motivated primarily by the …
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Field emitters with integrated focusing electrode
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, February 1999.
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Electrospray emitters For diffusion vacuum pumps
… to have a very low pump capacity, so an array of emitters is proposed as solution. This thesis also comments on the applicability of powder compression molding for the fabrication of emitter arrays. Powder compression molding consists in manufacturing the emitter array out of a plastic - metallic …
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Membrane deflection in inline drip emitters
… behavior of membranes found within inline drip emitters when subjected to a concentrated load. Knowing the response of the membrane can be useful in optimizing future emitter designs for characteristics such as lower activation pressure. Two different types of membranes were studied, one from …
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Lead-related quantum emitters in diamond
… photoluminescence measurements performed on emitters in nanofabricated pillars reveal several transitions, including a prominent doublet near 520 nm. The splitting of this doublet, 5.7 THz, exceeds that reported for other group-IV centers. These observations are consistent with the PbV …
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Laterally Current-Injected Membrane Photonic Crystal Emitters
Spontaneous electroluminescent emission modified by the photonic crystal is demonstrated. Details of the design, fabrication, and characterization required to create the laterally injected photonic crystal emitter are presented. It is found that photonic crystals offer a wide design space for …
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Photonic crystal emitters in heterogeneously bonded membranes
Photonic crystal (PhC) membrane lasers are good candidates for future photonic integrated circuit applications, including chip-to-chip and on-chip optical interconnects. This is due to their small size, lithographically tunable emission wavelength, and potential for low power operation. In order to …
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Inverse Design of Random Emitters in Nanophotonics
Incoherent light from random emitters, such as thermal radiation, are very common in nature. However, modeling such random emitters may be challenging, as it naively requires Maxwell’s equations to be solved for all emitters to obtain the total response, which becomes computationally intractable in …
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Optimization of molecular emitters for new generation OLEDs /
… breakthrough in the creation of novel molecular emitters and OLEDs, still there are some weaknesses. One of the widely-used emitters is phosphorescent, of which the blue ones, due to the specific structure, suffers from the low stability and insufficient lifetime. One of the candidates to replace …
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Fabrication and analysis of carbon nanotube based emitters
… are better understood and resolved, such CNT emitters can easily reach reduced brightness on the order of 10⁹ A m⁻² sr⁻¹ V⁻¹ and noise levels of about 1%. These results are about 10% better than the best brightness results from a nanotip emitter archived to date. Our CNT emitters have order of …
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Enhancing the Light output of Solid State Emitters
The work in this thesis focuses on improving the light output of room temperature emitting materials, and nanostructures as a stepping stone for use as single photon sources. The primary nanostructures studied are III-V based type-II emitting quantum dots/quantum rings (QDs/QR’s), which emit at …
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Development of Nanostructured Light Emitters in Gallium Nitride
Nanostructured light emitters in gallium nitride (GaN), including quantum wells (QWs) and quantum dots (QDs), are of widespread importance as the key technology enabling high- brightness blue light-emitting diodes (LEDs) and lasers. GaN-based QDs also show promise as novel polarised single-photon …
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Cavity absorber-emitters for high-temperature solar thermophotovoltaics
Solar energy has been an important component of the world's energy infrastructure for many years, but certain limitations have hindered its ability to become a primary source of renewable energy. In particular, intermittency and fundamental limitations on conversion efficiency have restricted …
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Parallel Plasma Field Directed Sputter Sharpening of Field Emitters
Many of the current methods to sharpen field emitters are time consuming and can only process one field emitter at a time. In this thesis, a method is proposed to parallel process multiple field emitters using a DC glow discharge plasma as the ion source in conjunction with field directed sputter …
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Engineering the optical quality of quantum emitters in WSe₂
… platform hosting localised single photon emitters. These single photons are of particular interest as they are the building blocks for many quantum technologies including quantum communication and quantum computing. This thesis focusses on the optical properties of these emitters, and how …
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Light-Induced Collective Interactions in Arrays of Quantum Emitters
… properties of an ensemble of closely spaced emitters are far more intricate. Coupling to a shared electromagnetic environment induces coherent and dissipative interactions between emitters, giving rise to a collective response that cannot be captured by treating them independently. In the …
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The effects of capillarity on photonic crystal selective emitters
… ideal candidates as high efficiency selective emitters. They are, however, known to degrade at elevated temperatures through a number of processes, with one of the most notable being surface evolution by capillary forces. By comprehensively simulating the morphological and optical effects of …
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Calculation of absorbed fraction for internal gamma-ray emitters.
Massachusetts Institute of Technology. Dept. of Nuclear Engineering. Thesis. 1974. M.S.
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