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 19 of 19 for “"dielectric environment"”.
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Optimum Performance of UHF RFID Tags in Dielectric Environment
… RFID tag antenna is that it is sensitive to the environment in which it operates. The performance of the tag degrades when placed on conductive or dielectric objects. While RFID tags near metal have been extensively evaluated in the literature, tags on and in dielectric media have received less …
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Photophysics of cadmium selenide quantum dot solids
… abrupt interface between the nanocrystal and its dielectric environment is not. In this thesis we study how the dielectric environment affects the quantum dot electronic structure, the optical absorption ~ross-section, charge separation, and transport in cadmium selenide colloidal quantum dots. …
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Potential technologies based on stamped periodic nanoparticle array
… through a probe molecule changes the local dielectric environment and hence affects surface plasmon resonance. However, the projected plasmon peak shift is not significant. Another detection method is described here to create a visible optical DNA sensor with a tolerable increase in cost …
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Engineered Plasmonic Nanostructures for Infrared Spectroscopy, Refractive Index Sensing and Nonlinear Optics
… resonance frequency on the size, shape and dielectric environment of the nanoscale system, mainly for sensing applications. The intense and localized field, generated by two adjacent metallic nanostructures when appropriately illuminated, has been utilized for enhancing the sensitivity of …
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Probing Exciton Dynamics in Metal–Organic Frameworks
… both among excitons and with the surrounding environment. To address this challenge, efforts in this thesis center around developing strategies for tuning exciton dynamics using metal–organic frameworks (MOFs) as a scaffold. Independent synthetic handles within MOFs will be mapped with the …
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Exploiting plasmons to sense interfacial changes at the nanoscale
… is sensitive to the size, shape and local environment of the nanoparticle. However, this sensitivity can be a limiting factor in applications of plasmonic materials in complex chemical environments. Contaminants in the environment can corrode or dissolve the nanomaterials, irreversibly …
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Ultrafast spatiotemporal dynamics of photoexcitations in two-dimensional semiconductors
… thin materials are very sensitive to their environment, it is also possible to tune the energies of electronic states through changes in the surroundings. Here, we engineer a potential landscape for excitons in the monolayer by introducing spatial variations in the dielectric environment. We …
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Complex Plasmonic Nanostructures: Symmetry Breaking and Coupled Systems
… have an extremely high sensitivity to the local dielectric environment, making them attractive for biosensing applications. Variations on the nanocluster geometry are then explored, and it is observed that by adding more particles and varying their sizes, the lineshape of the Fano resonance can …
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Interaction of azobenzene containing surfactants with plasmonic nanoparticles
… shift responding to the changes in local dielectric environment. Surface plasmon resonance condition allowed the estimation of the refractive index of azobenzene containing surfactants in solution.
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Plasmonic Nanoshells: Synthesis, Functionalization, and Photonic Applications
… coverage of the solar spectrum and optimize the dielectric environment around the metal oxide to improve the activity of the photocatalyst in the composite material. The targeted nanoparticles reported herein were characterized by scanning electron microscopy (SEM), transmission electron …
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Spectroscopic Studies of Organic Photovoltaic Non-Fullerene Acceptors
… host, we highlight the importance of both the dielectric environment, and the size of microcrystalline domains, in facilitating the HFCT interaction and polaron-pair generation in Y6. We confirm, with a Strickler-Berg analysis, the origin of the reported inverse temperature dependence of the …
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Plasmonic Nanostructures: Optical Nanocircuits, Tunable Charge Transfer Plasmons, and Properties of Fano Resonant Nanoclusters
… dimension and sense the change of the local dielectric environment, promising properties for surface enhanced spectroscopy and sensing applications. New interesting properties emerge, such as the Fano resonance, when clusters of nanoparticles are brought into close proximities. The reduced …
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Optical properties of metal nanoparticles and their influence on silicon solar cells
… provided that the substrate and local dielectric environment were accounted for by inclusion of an effective medium in the model. Cr adhesion layers were found to substantially weaken the extinction peaks of Au nanoparticles, and also result in a strong decrease of radiative efficiency. …
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Fast Sweeping Methods for Steady State Hyperbolic Conservation Problems and Numerical Applications for Shape Optimization and Computational Cell Biology
… for representing the topography of a dielectric environment and efficient techniques to solve different material design problems. Numerous results are shown to demonstrate the robustness of the gradient-based approach.In the last part, we model and simulate an important biological …
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Mapping plasmon excitations in gold nanostructures using electron energy loss spectroscopy
… 4 explores more complex and realistic environmental factors of temperature and the surrounding dielectric environment in Chapter 4. Understanding the effect annealing has on nanostructures is important for HAMR as they transducer is exposed to fluctuating high temperatures during the …
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Investigation of the Synthesis and Optoelectronic Properties of Ultrasmall CdSe Quantum Dots
… of the QD band structure based on the environment of the surface of the QDs was examined by 1) ligation and 2) alteration of dielectric environment. First, QDs were ligated with one of the following: dodecanethiol, oleic acid, piperidine, or benzenesulfonic acid monohydrate. Second, the …
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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
… on the particle size and shape and the local dielectric environment. Nanoparticle absorption and scattering cross-sections are maximized at surface plasmon resonance frequencies, and the electromagnetic field is amplified near the particle surface. Plasmonic effects can enhance the …
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Nanoscale Characterisation of Heterointerfaces in 2D Materials
… this, we identify nanoscale inhomogeneities in dielectric environment and strain, which we believe are a result of sample fabrication. Furthermore, we show adopting more advanced fabrication processes improve these effects. We also show that these techniques can be employed on complex device …
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Charge and energy transport in 0D/2D systems probed using linear and nonlinear spectroscopy
… The ability to tune these interactions via the dielectric environment is an important step toward more efficient optoelectronic technologies featuring atomically thin materials. In Chapter 3 we investigate coupled QD/TMD hybrid structures. In the first half of Chapter 3, we investigate …