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 230 for “"Optoelectronics"”.
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Hybrid optoelectronics with colloidal nanocrystals
In this work we present spectroscopic studies of the exciton dynamics in colloidal spherical cadmium sulfide CdS nanocrystals (NC) in the vicinity of a single indium gallium nitride InGaN quantum well (QW) in dependence of temperature. QWs of the alloy material InGaN exhibit a dependence of the …
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Molecular Optoelectronics in Plasmonic Nanocavities
Creating functional optoelectronic devices using individual or ensembles of molecules is currently an active research area, driven by the ever-increasing demand for miniaturisation of electronic devices and the exploration of light-matter interactions at the molecular level. This thesis …
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Three-dimensional photonic crystal optoelectronics
Photonic crystals are a class of synthetic materials which can control the absorption, emission and propagation of light to an unprecedented degree. In order to fully utilize their properties defect must be added to photonic crystals to direct the flow of light, and light emitting structures must …
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Printable 2d Material Optoelectronics and Photonics
… hold enormous potential for the next generation optoelectronics and photonics. Pairing 2d materials with printing is an emerging cost-effective large-scale device fabrication strategy. However, the current inks are far from ideal to support reproducible device fabrication. In addition, the …
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Waveguide Integrated Optoelectronics Using Two-Dimensional Materials
The focus of this dissertation is the integration of 2D materials on a silicon photonics platform for optoelectronic applications. The current state of waveguide integrated photodetectors and modulators is reviewed and provides a context for the work detailed in the following chapters. The first …
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GAN-ON- SI(100) NANOSTRUCTURES FOR OPTOELECTRONICS APPLICATIONS
… development of high quality GaN epilayers for optoelectronics applications. GaN based materials were grown on Si(100) substrates by modifying the surface of the Si(100) substrate to expose the Si(111) planes . The Si(100) plane has a four-fold (square) atomic symmetry while the Si(111) possess …
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OPISA optoelectronics packaging interfaces for sub-micron alignment
For optoelectronic devices submicron precision is required to optimally couple the laser source with the optical fibre. Laser welding is used because of its inherent attributes of accuracy, strength, cleanliness and minimised heat affected zone and structural changes. Due to the rapid …
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Optoelectronics of graphene-based Van der Waals heterostructures
Research on van der Waals (vdW) materials (homo- or hetero-) is a rapidly emerging field in condensed matter physics. They are layered structures with strong chemical bonding within layers and relatively weak van der Waals force to combine layers together. This unique layer-bylayer nature makes it …
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Integrated optoelectronics applications in fiber optic receiver packaging
… and evaluation of a new style of integrated optoelectronics. The approach combines the selectivity of traditional hybrid integration with the "internal" interconnection capabilities of monolithic integration, through the use of low temperature cofireable ceramic (LTCC) tape systems. This new …
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Optics and Optoelectronics of Atomically Thin Magnets and Semiconductors
Since the discovery of graphene, layered van der Waals materials have become one of the most active subjects of study. The array of available atomically thin materials has expanded rapidly beyond graphene, encompassing a wide variety of physical properties ranging from insulators like hexagonal …
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Terahertz optoelectronics components of semiconductor materials with deep defects /
First part of this work was orientated on investigation of new material suitable for THz components activated with longer wavelength (1 and 1.55 μm) laser radiation. Dynamics of photoexcited electrons was investigated from the optically induced THz absorption of LTG GaAs layers grown on AlAs/GaAs …
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Thin film technology for optoelectronics and their thermal management
Thin-film semiconductor optoelectronics are important for applications from optical communication, solid-state lighting, and wearable electronics to biomedical sensors. It is now possible to separate the micrometer-thick device layers from their native substrates and transfer them onto new …
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Unconventional structured semiconductors and their applications in optoelectronics and photovoltaics
… GaN (PGaN), which is of particular interest for optoelectronics due to its large direct bandgap (3.4 eV). PGaN is also promising for use as a substrate for epitaxial growth and for chemical and biosensing. Several possible applications for PGaN have been explored. PGaN is able to be …
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Pathways for quantum dot optoelectronics fabrication using soft nanoimprint lithography
… Here it is explored for application in the optoelectronics area. A variant of NIL using a flexible polymeric mold, termed “soft NIL” is used to create and study quantum dot arrays according to two concepts. In the first concept, a dense array of nano-sized holes are etched into a blank GaAs …
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Modification of exciton energies and dynamics for thin film optoelectronics
Organic and nano-crystal thin film semiconductors have proven to be effective materials for a range of optoelectronic applications including light emitting diodes, visible wavelength lasers, photovoltaics, and sensors. Mediating photons and charges, excitons are responsible for electrical and …
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Two-dimensional electronics and optoelectronics: From materials syntheses to device applications
<p>The current research on semiconductor device has pushed the scaling of the devices into sub-10 nanometers (nm) regime. While most of the current devices are made on silicon germanium, and III-V materials, people are looking for new materials for use in novel semiconductor devices: either for use …
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Photophysics and optoelectronics of metal halide perovskites and other unconventional semiconductors
Metal Halide perovskites possess a unique set of properties, from the high absorption coefficient, the tunable bandgap and the high mobility to long range diffusion length. Impressive performances in photovoltaic applications, light-emitting diodes, lasers and photodetectors have shown the …
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Si-based Germanium-Tin (GeSn) Emitters for Short-Wave Infrared Optoelectronics
<p>Conventional integrated electronics have reached a physical limit, and their efficiency has been influenced by the generated heat in the high-density electronic packages. Integrated photonic circuits based on the highly developed Si complementary-metal-oxide-semiconductor (CMOS) infrastructure …
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