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 24 for “"Surface plasmon polaritons"”.
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Polarization Conversion Mediated Surface Plasmon Polaritons in Extraordinary Optical Transmission through a Nanohole Arrays
… arrays, much research has focused on the role of surface plasmon polaritons (SPPs) in EOT. While the energy and momentum conditions have become clear, no consensus has been reached on the role of incident light polarization. This study presents a simple model that captures Bloch-SPP excitation, …
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Light–matter interaction in liquid crystal cells
… The second effect we model is the coupling of surface plasmon polaritons<br/>at the interface between a metal layer and a photorefractive liquid crystal cell. We implement<br/>existing numerical models to gain a thorough understanding of the system. These models are<br/>qualitatively compared …
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Surface plasmon polariton mediated energy transfer from external antennas into organic photovoltaic cells
… transferred into the photovoltaic cell via surface plasmon polariton modes in an interfacial thin silver contact. By decoupling the optical and electrical functions of the cell, this new architecture has the potential to circumvent the tradeoff between light absorption and charge separation …
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Organic photovoltaics and concentrators
… we utilize external energy transfer mediated by surface plasmon polaritons to increase the efficiency of existing organic photovoltaic devices limited in performance by the exciton diffusion bottleneck. This unique architecture is analyzed for its functionality and the efficiencies of each added …
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Light and Single-molecule Coupling in Plasmonic Nanogaps
Plasmonic cavities confine optical fields at metal-dielectric interfaces via collective charge oscillations of free electrons within metals termed surface plasmon polaritons (SPPs). SPPs are confined in nanometre gaps formed between two metallic surfaces which creates an optical resonance. This …
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Genetic algorithm gradient ascent (GAGA) optimization of compact symmetry-breaking photonic crystals
… DC current bias. This momentum bias imparts plasmon Fizeau drag, the drag of an electrical current on propagating surface plasmon polaritons (SPPs). A semi-classical theory recently developed is used to model SPP transport along interfaces of 3D semimetals under Fizeau drag3 . Lastly, in both …
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Effects of Metallic Nanoalloys on Dye Fluorescence
… SIFs. This enhancement phenomenon — due to the surface plasmon polaritons associated with the metallic NPs — can be explained by energy transfer from the metal NPs to the fluorescent dye molecules or by a modified local electromagnetic field experienced by the fluorophores in the vicinity of …
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Study of Field Enhancement by Spherical Voids in Gold Lattices by Using Three Dimensional Finite Difference Time Domain Simulations
… of the light (field enhancement) near the metal surface. Field enhancement properties of nanostructured metals can significantly enhance efficiency of an upconverter used in solar cells. The objective of this work was to develop an understanding why selfassembled porous and nanoporous spherical …
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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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A fundamental study of epitaxial graphene on silicon carbide on silicon for mid-infrared nanophotonics
… gas detection, machine vision, and navigation. Plasmonics has enabled sub-diffraction confinement and manipulation of light. However, the high losses and lack of dynamic tunability characterising the conventional metal plasmonics in the MIR ranges represent a bottleneck for further progress. …
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Integrated plasmonic nano-antenna devices
Surface plasmon polaritons (SPPs) are evanescent electromagnetic waves propagating at the interface between a dielectric and a metal. Following recent developments, they may find application in future generations of opto-electronic devices. An example of a plasmonic device is a nano-antenna. …
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Metal-insulator-insulator-metal plasmonic waveguides and devices
Metal-insulator-metal (MIM) plasmonic waveguides have been proposed for highly integrated subwavelength structures. In this work, waveguiding and coupling of surface plasmon polaritons (SPPs) within finite planar MIM plasmonic waveguides are examined both theoretically and experimentally. Gain …
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Guiding of plasmons and phonons in complex three dimensional structures
… of the structures. Of particular interest are surface electromagnetic modes known as surface plasmon-polaritons (SPPs). In the second part of this thesis, we report measurements and modeling of thermal conductivity in periodic three-dimensional dielectric nanostructures: silicon inverse opals. …
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Nonreciprocal and Exotic Radiative Transfer in Type-I Magnetic Weyl Semimetals
… law of radiation, and that nonreciprocal surface plasmon polaritons (SPPs) excited on this interface drive the nonreciprocity in the radiative heat transfer. In addition, we propose a physical mechanism for the nonreciprocity in terms of the forces felt by electrons as a result of the …
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Energy transfer between surface plasmon polariton modes with hybrid photorefractive liquid crystal cells
… significant photorefractive control of Surface Plasmon Polaritons (SPP). The photorefractive effects are generated through optically controlling the conductivity of a ~100nm photoconducting poly-N-vinyl-carboxyl (PVK) layer. Therefore, when a potential is applied across the cell, the …
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Advanced light manipulation and waveguiding in plasmonic nanostructured optical fibers.
… technologies for optical nanostructures such as plasmonic and metasurfaces allows us to overcome these limitations by tailoring those optical properties for advanced light manipulation and the development of novel optical fiber devices. In this dissertation, I have reported four main projects on …
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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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Excitation, Interaction, and Scattering of Localized and Propagating Surface Polaritons
Surface polaritons, i.e., collective oscillations of the surface charges, strongly influence the optical response at the micro- and nanoscale and have to be accounted for in modern nanotechnology. Within this thesis, certain basic phenomena involving surface polaritons are investigated by means of …
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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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Active and Fast Tunable Plasmonic Metamaterials
Active and Fast Tunable Plasmonic Metamaterials is a research development that has contributed to studying the interaction between light and matter, specifically focusing on the interaction between the electromagnetic field and free electrons in metals. This interaction can be stimulated by the …
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