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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 398 for “"Quantum Dot"”.
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Patterned Quantum Dot and Inverse Quantum Dot Active Layers for Optoelectronics Applications
Made available in DSpace on 2010-01-06T16:13:31Z (GMT). No. of bitstreams: 4 license.txt: 4058 bytes, checksum: 1b0023be2ac8791ebabc4baafb89f7c9 (MD5) Verma_Varun.pdf.pdf: 3802336 bytes, checksum: f0f4edc3dcda69ec6a1c663fbb45b696 (MD5) Verma_Varun.pdf: 3802336 bytes, checksum: …
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Semiconductor quantum dot lasers.
Stimulated emission in semiconductor quantum dot (QD) laser structures is demonstrated. Red-emitting, self-assembled QDs of highly strained InAlAs were grown by molecular beam epitaxy on GaAs substrates. Carriers injected electrically from the doped regions of separate confinement heterostructures …
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Transport properties of quantum dot molecules and electronic structure of graphene quantum dot qubits
Coupled Quantum dots systems, or quantum dot molecules (QDMs), have been suggested as good candidates for nanoelectronics, spintronics, thermoelectrics, and quantum computing applications. The knowledge in the transport and electronic properties of QDMs is important in making progress toward …
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A quantum dot heterojunction photodetector
… for photodetectors utilizing colloidally grown quantum dots as the principle photo-active component. We implement a thin film of cadmium selenide (CdSe) quantum dot sensitizers, sandwiched between an electron-transporting titanium dioxide (TiO2) layer and a hole-transporting N,N' diphenyl-N,N' …
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Quantum dot gain-lever laser diode
Semiconductor quantum dot (QD) lasers are competitive candidates for many applications such as high-speed long-haul optical communication systems. This is due to their superior lasing characteristics (compared to conventional quantum well (QW) lasers) and also their potential for high differential …
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Quantum dot based semiconductor disk lasers
… of semiconductor disk lasers based on novel quantum dot (QD) structures. QD structures were embedded in this type of laser recently and allowed a number of advantages compared with the widely used quantum well (QW) structure. These included new spectral region coverage at 1-1.3 µm, enhanced …
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All inorganic colloidal quantum dot LEDs
This thesis presents the first colloidal quantum dot light emitting devices (QD-LEDs) with metal oxide charge transport layers. Colloidally synthesized quantum dots (QDs) have shown promise as the active material in optoelectronic devices because of their tunable, narrow band emission. To date, the …
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Physics of intraband quantum dot optoelectronic devices
… decades, semiconductor nanostructures, such as quantum wells, wires and dots, have been recognised as sources and detectors of radiation in the mid- and far-infrared region of the spectrum. Much of a success has been obtained with quantum well based intraband devices, such as quantum cascade …
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Quantum dot-based semiconductor Terahertz transceiver systems
… investigation into the potential utilisation of quantum dot (QD)-based semiconductor materials and devices in THz systems. This thesis discusses the work carried out in the development of a novel class of PCA devices which were postulated to enable efficient optical-to-THz signal conversion, …
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Optically injected dual state quantum dot lasers
… the feasibility of optically injected dual state quantum dot lasers as artificial photonic neurons. Photonic waveguides are not as sensitive to centimetre long transmission lines as electronic circuits. This could be particularly advantageous for neural networks where one element, a neuron, must …
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Electronic transport in CdSe quantum dot arrays
… If the island is made still smaller, the quantum confinement energy also becomes large, the electronic states on the dot become discrete, and the island is called a quantum dot, or sometimes an artificial atom. Quantum dots have been a focus of active research for the past decade, both as …
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Magnetic properties of an isolated quantum dot
Thesis (M.Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science; and, Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Physics, 2003.
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Gallium Nitride (GaN) quantum dot layer formation
Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 2006.
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Photophysics of cadmium selenide quantum dot solids
Semiconductor quantum dots or nanocrystals have size dependent optical and electronic properties that arise from quantum confinement. While the quantum size effect is reasonably well understood, the effect of abrupt interface between the nanocrystal and its dielectric environment is not. In this …
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Design and fabrication of quantum-dot lasers
Semiconductor lasers using quantum-dots in their active regions have been reported to exhibit significant performance advantages over their bulk semiconductor and quantum-well counterparts namely: low threshold current, high differential gain and highly temperature stable light-current …
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Quantum dot-based nanomaterials for biological imaging
Quantum dot-based fluorescent probes were synthesized and applied to biological imaging in two distinct size regimes: (1) 100-1000 nm and (2) < 10 nm in diameter. The larger diameter range was accessed by doping CdSe/ZnS or CdS/ZnS quantum dots (QDs) into shells grown on the surfaces of pre-formed …
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Theory of Tunneling-Injection Quantum Dot Lasers
… tunneling-injection of electrons and holes into quantum dots (QDs) from two separate quantum wells (QWs). The potential of such a tunneling-injection QD laser for temperature-stable and high-power operation is studied under the realistic conditions of out-tunneling leakage of carriers from QDs …
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Novel quantum dot and nano-entity photonic structures
… novel nanocomposite materials by incorporating quantum dots, and other nanoentities, into polymer and sol-gel derived matrices, aiming to produce integrated photonic structures. Its objectives embrace the synthesis and the investigation of photonic materials, together with alternative …
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