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Showing 1 to 20 of 186 for “"Plasmonics"”.
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Experiments in Graphene and Plasmonics
… based optical sensors, and grating based plasmonics are explored experimentally. Graphene nanoribbons exhibit highly insulating states that may allow for graphene based digital applications. We investigate the sensitivity of these states to local charged impurities in ultra high vacuum. We …
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Towards infrared plasmonics in graphene
… provide an outlook of future studies of graphene plasmonics, including plasmon excitation with solid-state cavity quantum electrodynamics (QED).
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Multiresonant Plasmonics with Spatial Mode Overlap
… Overcoming the limitations of single-resonant plasmonics requires development of plasmonic devices that can enhance the optical interactions at the same locations but at different resonance wavelengths. This dissertation comprehensively studies the theory, design, and applications of such …
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Polyelectrolyte multilayers for plasmonics and picosecond ultrasonics
… application of polyelectrolyte multilayers in plasmonics and picosecond acoustics. The observed samples were fabricated by the spin-assisted layer-by-layer deposition technique that allowed a precise tuning of layer thickness in the range of few nanometers. The first field of interest deals …
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The study of plasmonics in nanohole metallic metamaterials
Plasmonics is the study of light-matter interaction. The interaction of incident light (photons) with surface plasmons present in metamaterials results in unique optical properties. Nanohole arrays are a metamaterial consisting of an array of sub-wavelength holes perforated in an optically thin …
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Molecular Plasmonics: Graphene Plasmons in the Picoscale Limit
Doped graphene supports surface plasmons in the mid- to far-infrared that are both electrically and spatially tunable. Graphene has been shown to enable greater spatial confinement of the plasmon and fewer losses than typical noble metals. Reduced-dimensional graphene structures, including …
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Plasmonics for On-Chip Photodetectors and Light Sources
<p>Quantum emitters and thermal photodetectors serve as key building blocks for future quantum information and sensing systems. Their properties can be significantly enhanced by integrating them with nanostructured elements, tailoring their interactions with incident optical fields. Quantum …
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Nanolaminated Plasmonics: from Passive to Active Nanophotonics Devices
Plasmonics can achieve the tight optical confinement and localization in the subwavelength domain. Surface plasmon polaritons (SPPs) are closely related to coupling to emitters in excitation and emission, waveguiding, and active modulating on the nanoscale. Due to these phenomenon, plasmonic …
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The plasmonics of a nanosphere on a mirror substrate
… of the substrate plays a key role in the plasmonics of a NPoM. As reflectivity increases, a vertical dipole plasmon modes develops, while increasingly negative permittivities give rise to surface plasmons in the film, which are sensitive to film thickness and hybridise with the particle’s …
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Multimodal Optical Interfaces Enabled by Multiresonant Plasmonics for Bio-Nanophotonics
Engineering tools at the nano-bio interface have enabled transformative advances in molecular diagnostics, therapeutic monitoring, and cellular manipulation. However, challenges remain in achieving continuous real-time sensing, intracellular probing, and controlled actuation within an integrated, …
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Hybrid nanolayer architectures for ultrafast acousto-plasmonics in soft matter
The goal of the presented work is to explore the interaction between gold nanorods (GNRs) and hyper-sound waves. For the generation of the hyper-sound I have used Azobenzene-containing polymer transducers. Multilayer polymer structures with well-defined thicknesses and smooth interfaces were built …
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Controlling light on the nanoscale: ultrafast plasmonics and phase change functionality
The first experimental confirmation that femtosecond plasmon pulses can be generated, transmitted and modulated along a metal/dielectric waveguide is achieved. The ultrafast optical modulation of plasmons is accomplished by optical excitation of the aluminium plasmonic waveguide using 200 fs …
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Plasmonics Using High Quality Epitaxial Graphene: An Approach towards Next-Generation Optical Computing
<p>Optical computing has been proposed for high performance applications owing to light's high frequency and noise tolerance. However, the diffraction limit of light prevents the shrinking of optical components to dimensions significantly smaller than the wavelength of light, typically µm's, …
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Quantum Plasmonics: A first-principles investigation of metallic nanostructures and their optical properties
The electronic structure and optical properties of metallic nanoparticles are theoretically investigated front first principles. An efficient implementation of time-dependent density functional theory allows a fully quantum mechanical description of systems large enough to display collective …
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Towards sustainable plasmonics: a study on the shapes and plasmonic properties of magnesium nanoparticles
… experimental and theoretical research. For plasmonics, where nanostructures are exploited to focus and channel light in the nanoscale, material and structure effects are studied in relation to optical properties. Understanding such light-matter interactions can inspire the design and …
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Cavity Plasmonics - Exploring narrow-gap plasmonic coupled systems to boost, localize and exploit nanometric light -matter interaction
The core of this thesis explores the optical response and tuneability of plasmonic cavities. At its heart stands the nanoparticle on mirror construct (NPoM) - a robust plasmonic cavity formed via self-assembly. It consists of a nanoparticle placed on top of an under- lying metal substrate separated …
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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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Plasmonic devices based on transparent conducting oxides for near infrared applications
… have been many breakthroughs in the field of plasmonics and nanophotonics that have enabled optical devices with unprecedented functionalities. Even though remarkable demonstration of at photonic devices has been reported, constituent materials are limited to the noble metals such as gold (Au) …
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Mapping plasmon excitations in gold nanostructures using electron energy loss spectroscopy
… physics behind them. We introduce the concept of plasmonics in chapter 1 where we describe the historical significance and fundamentals underpinning the topic. We provide a description of the conditions under which plasmons can be created and highlight some key concepts which are used throughout …
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Plasmonic interactions in the quantum tunnelling regime
… of physics, chemistry and biology in plasmonics. Consequently, understanding light-matter interactions in such closely spaced, electromagnetically coupled, metallic nanosystems is of vital importance to a tremendous variety of current and future nanophotonic technologies. This thesis …
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