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 resonance"”.
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Dynamic control of plasmonic resonances with graphene based nanostructures
… high operating frequencies. Hence, the field of plasmonics opens up the possibility of developing nanoscale optoelectronic circuitry for computing and sensing applications. One of the challenges in this effort is the lack of tunable plasmonic resonance. Currently, the resonant wavelength of …
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Applications of Cathodoluminescence in Plasmonic Nanostructures and Ultrathin InAs Quantum Layers
… Two specific optical nanomaterials, including plasmonic nanostructures and semiconductor quantum layers, are investigated by the cathodoluminescence (CL) measurement. </p> <p>Surface plasmonic resonance can be generated when high-energy electrons strike the interface between the dielectric …
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Optically Active Metamaterials Made of Plasmonic Nanoparticles and Chitin Nanocrystals
… optically active metamaterials composed of plasmonic nanoparticles embedded in a helicoidal architecture made of chitin nanocrystals, and to understand how the material interact with light to generate macroscopic circular dichroism. The material fabrication was based on a unique …
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Materials and strategies for flexible, stretchable and large area photonic devices
… Similarly, large area and highly stretchable plasmonic nanoparticle arrays will be obtained to show large resonance tuning for the first time with unusual three dimensional buckled structure beyond critical strain. The mechanics and plasmonic resonance associated with such large strains will …
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Au nanorods-semiconductor nanowire hybrid nanostructures : nanofabrication techniques and optoelectronic properties
… conditions by exploring the longitudinal plasmonic resonance mediation of chemical-synthesized Au nanorods deposited on the nanowire surface otherwise not observable on bare ZnO nanowire. Finally, nanofabrication and detailed electrical characterization of ZnO nanowire field-effect …
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Nanophotonics for tailoring light-matter interaction/
… interaction. The first phenomenon is plasmonic resonance, where the surface plasmon mode at metal and dielectric boundaries significantly enhances the optical response of nanoparticles. We propose an optimization-based theoretical approach to tailor the optical response of …
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Study of Field Enhancement by Spherical Voids in Gold Lattices by Using Three Dimensional Finite Difference Time Domain Simulations
… enhancement at 980 nm. Four out of five active plasmonic modes of spherical voids in gold films were found to be localized plasmons, less vulnerable to structural defects. Four diameters (between 800 nm and 1600 nm) provided the highest field enhancement at film thickness of 0.26 times their …
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Evaluation of Colloidal Stability and Ecotoxicity of Metal-based Nanoparticles in the Aquatic and Terrestrial Systems
… in the colloidal diameter, surface charge, and plasmonic resonance revealed modulating effects of variable water chemistry and organic ligands on the particle stability, dissolution, and toxicity of AgNPs against <em>Escherichia coli </em>or<em> Daphnia magna</em>. Silver dissolution increased …
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Silica Microspheres Functionalized with Self-assembled Nanomaterials
… is the lack of functionalities such as gain, plasmonic resonance, and second-order nonlinearity. Silica possesses third order nonlinearity but cannot produce second order nonlinearity, plasmonic resonances, or fluorescence emission. The key to overcome this deficiency is to develop versatile …
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Novel Applications of Terahertz Quantum Cascade Lasers: Gas Spectroscopy, Active Control & Nearfield Imaging
… a variety of samples. It is able to reveal the plasmonic resonance of resonant structures, spatially map the electric field distribution on a metamaterial device and image subsurface plasmons. By using tips of different materials, it has also been found that a gold coating can improve the THz …
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Nanoplasmonics and silicon nanophotonics devices for sensing applications
… One of the subsets of nanophotonics is nanoplasmonics, which deals with manipulation of light using the unique optical properties of metal nanostructures. Manipulation of light in nanoscale using properties of surface plasmon will make it possible to accomplish a myriad of applications …
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Development of label-free colorimetric plasmonic sensor for biomedical applications
… fabrication and characterization of a label-free plasmonic-based colorimetric sensor on a flexible plastic substrate consisting of periodic nano cups, also referred a nano Lycurgus cups, in an array covered with metal nanoparticles on the side walls and have sub-wavelength openings to provide …
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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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Laterally confined THz sources and graphene based THz optics
… confinement on the intersubband states and the plasmonic mode in a THz QCL. One of the key experimental challenges in scaling down from QCLs to quantum-dot cascade lasers is the electrical injection into the nanopillars. This involves insulation and planarisation of the high aspect-ratio …
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Experiments on the Thermal, Electrical, and Plasmonic Properties of Nanostructured Materials
… in nanodendritic porous silicon, and plasmonic enhancement in silver nanospheroids as a reverse photolithography technique. Nanostructured thermoelectrics have been proposed to greatly increase thermopower efficiency and to bring thermoelectrics to mainstream power generation and …
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Photothermal properties and applications of gold nanorods
… gold nanocrystals have tunable surface plasmonic resonance (SPR) bands ranging from the visible to the near infrared region. Their small dimensions of less than 100 nm and inert reactivity as well as the ease of surface functionalization facilitate their interaction with biological …
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Thin-Film Polymer Nanocomposites Composed of Two-Dimensional Plasmonic Nanoparticles and Graphene
Plasmonic polymer nanocomposites contain plasmonic nanoparticles that are dispersed within a polymer. The polymer matrix strongly influences the optical properties of plasmonic nanoparticles. It is imperative to understand the interaction between plasmonic nanoparticles and polymers so that one can …
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Dynamic Plasmonic Metasurfaces in the Visible Spectrum
… more functional to keep pushing the boundaries. Plasmonic metasurfaces have been shown to control the phase, amplitude and/or polarisation of incoming electromagnetic radiation. Nano-fabrication advancements have resulted in the fabrication of the building blocks of such metasurfaces at …
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Interactions of Organic Fluorophores with Plasmonic Surface Lattice Resonances
… the strongest plasma oscillations are known as “plasmonic” metals. In terms of pure elements, the most plasmonic metals are, canonically, copper, silver, and gold. But there are several others that are known to be plasmonic, namely aluminum, gallium, and indium, as well as the alkali metals, …