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 20 for “"Plasmonic enhancement"”.
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Plasmonic Enhancement of Nonlinear Optical Responses by Gold Nanorods
… of local electric fields through resonances of plasmonic excitations in metallic nanoparticles is a major area of current optical research. This dissertation is focused on plasmon-enhanced second harmonic generation of organic ionic self-assembled films via localized surface plasmon resonance of …
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Fluorescence Resonance Energy Transfer (FRET) systems for biomedical sensor applications
… mode. The interaction between FRET and the plasmonic enhancement of uorescence in the presence of adjacent metal nanoparticles was also investigated. Dipole-dipole interactions limit the FRET e�ect to donor-acceptor distances of typically less than 10nm. The use of the plasmonic e�ect to …
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Plasmonic and Superconducting Self-Assembled MBE Grown Indium Islands
… high quality metal films or nanostructures for plasmonics. Recently MBE grown silver films have been shown to possess optical constants closer to that of intrinsic silver leading to lower losses and thus allowing for higher quality plasmonics. MBE has also been used to grow silver nanocrystals …
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Enhancing solar cells with plasmonic nanovoids
This thesis explores the use of plasmonic nanovoids for enhancing the efficiency of thin-film solar cells. Devices are fabricated inside plasmonically resonant nanostructures, demonstrating a new class of plasmonic photovoltaics. Novel cell geometries are developed for both organic and amorphous …
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Synthesis and alignment of gold nanorods for optical applications
… the vicinity of the ends of the nanorods. This enhancement can be increased and additive when multiple gold nanorods are aligned and can be useful for sensing and plasmonic enhancement. This study of alignment and surface chemistry of gold nanorods is to help elucidate simplistic ways to create …
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METAL NANOSTRUCTURES-ENHANCED AIE-BASED PHOTOSENSITIZERS FOR PHOTODYNAMIC THERAPY
… photosensitizers. The second approach is the plasmonic enhancement of singlet oxygen generation, where the optical properties of the photosensitizer molecule could be modulated in the vicinity of plasmonic metal nanoparticles. In this Ph.D. work, different metal/AIE-PS nanohybrids with …
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Functional Molecular Spacers for Plasmonic Nanojunctions: Design, Synthesis and Self-Assembly
… field strength - a phenomenon known as plasmonic enhancement. This facilitates enhanced light-matter interactions with broad potential for advanced nanophotonic applications, including few-molecule sensing, reaction monitoring, quantum information systems, molecular electronic devices, …
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Time-Resolved Interactions of Infrared Vibrations and Plasmonic Nanogaps
… and nanochemical reactions. Whilst the plasmonic enhancement offered by metal nanostructures can dramatically enhance these processes, the effects of metal-molecule coupling remain poorly understood due to significant challenges in probing the dynamics of nanoscale systems. In this …
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Towards Urine Sensing in Plasmonic Nanogaps
… molecules in liquids. By confining molecules to plasmonic hotspots between metal surfaces, low concentrations of analytes can be detected. This opens opportunities for multiplexed sensing, but also poses a challenge for the selective measurement of complex analytes, such as urine, which contain …
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Optical and Electronic Interactions at the Nanoscale
… photoluminescence apparatus to demonstrate an enhancement of radiative rates in cadmium sulfide nanowires due to plasmonic enhancement from interactions of hot excitons with a concentric electrically conductive silver coating. In the final experiment we return to cadmium selenide quantum dots …
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Plasmonic Nanoshells: Synthesis, Functionalization, and Photonic Applications
… particles, we employed silica-coated GS-NSs for plasmonically enhanced photocatalytic solar-to-fuel energy conversion and found that they increased hydrogen production up to 2.6 times as compared to an unmodified photocatalyst. This research has provided us a template for further investigations …
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Self-organization on Nanoparticle Surfaces for Plasmonic and Nonlinear Optical Applications
… of metal nanoparticles for use in plasmonic and nonlinear optical (NLO) applications. In the first two chapters, I describe a series of experiments, where I combined silver nanoparticles fabricated by nanosphere lithography with ionic self-assembled multilayer (ISAM) films, tuning …
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Ab initio modelling of photoinduced electron dynamics in nanostructures
… with metal nanoparticles (MNPs) due to a plasmonic enhancement effect. While such an effect has been demonstrated experimentally, it is hard to show theoretically from an ab initio point of view due to the computational demand of such calculations: the state-of- the-art approaches commonly …
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Development of surface-enhanced Raman spectroscopy coupled with nanosubstrates and machine learning to improve food safety
… create high-surface-area scaffolds with strong plasmonic enhancement. These electrospun substrates demonstrated excellent uniformity and reproducibility, enabling the sensitive detection of the fungicide thiabendazole in soy-based foods with detection limits down to parts-per-billion levels (LOD …
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Breaking Symmetry: A Study of Novel Phenomena in Asymmetric Nanoplasmonic Systems
… for many optical applications. For example, plasmonic systems consisting of periodic arrays of achiral metallic sub-wavelength scatterers, referred to as metasurfaces, can manipulate the phase front of light waves over nanometer scale distances. This is possible due to the plasmonic …
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Portable electrochemical and plasmonic biosensors for biomedical application
… systems mentioned above for POC applications. Plasmonic and electrochemical methods are the two techniques that will be illustrated in this dissertation. The plasmonic method is new in the sensing area. Plasmon is the oscillation of free electrons at the interface of metal and dielectric …
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Experiments on the Thermal, Electrical, and Plasmonic Properties of Nanostructured Materials
… and are rapidly becoming the primary route to enhancement for the electrical, thermal, and optical properties of materials. The work presented in this dissertation details fabrication and characterization techniques of thin films and nanoparticles for these purposes. The four primary areas of …
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Spectroscopic Studies of Abiotic and Biological Nanomaterials: Silver Nanoparticles, Rhodamine 6G Adsorbed on Graphene, and c-Type Cytochromes and Type IV Pili in Geobacter sulfurreducens
… field is amplified near the particle surface. Plasmonic effects can enhance the photochemistry of silver particles alone or in conjunction with semiconductors according to several mechanisms. We study the photooxidation of citrate by silver nanoparticles in a photoelectrochemical cell, focusing …
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Dye sensitized solar cells: optimization of Grätzel solar cells towards plasmonic enhanced photovoltaics
… and lowered material cost. By utilizing their plasmonic properties, incident light can be scattered, concentrated, or trapped thereby increasing the effective path length of the cell and allowing the physical thickness of the cell to be reduced. This concept can also be applied to DSSCs, which …
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Sensing Applications of Silver and Gold Nanoparticles
… are ideal materials to fabricate these nanoscale plasmonic particles or structures. This work addresses the synthesis, characterization, and sensing applications of Au and Ag nanoparticles (NPs). The progress on certain subjects related to our work"NP synthesis, surface functionalization, Au …