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 32 for “"metal-dielectric"”.
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Hybrid metal-dielectric metasurfaces for enhanced optical performance
… performance. Metasurfaces can be fabricated from metals (plasmonic metasurfaces) or dielectrics (all-dielectric metasurfaces). The work outlined in this thesis focuses on the effect of the combination of metals and dielectrics on the performance of metasurfaces. The thesis investigated the …
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Resonances of periodic metal-dielectric structures at the infrared wavelength region
Metal meshes have been used as reflectors in radar receivers for wavelength much longer than the periodic constant of the conducting wires and as optical reflectors in a FabryPerot in the far infrared. Cross shaped metal meshes can be used as band pass filters but the design theory and near field …
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Effects of Ultrathin Interlayers on Thermal Boundary Conductance at Metal-Dielectric Interfaces
… the modification of thermal conductance at metal-dielectric interfaces by inserting few-nanometer thick metal interlayers. A thickness-dependent interlayer study suggests that interfacial conductance alters significantly at ultrathin thicknesses before reaching a plateau. Our results reveal …
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Selective electro-magnetic absorbers based on metal-dielectric-metal thin-film cavities
… with high intrinsic losses such as carbon black, metal-black, and carbon nano-tubes etc. are bulky, not design-tunable and are hard to pattern for micro- and nano- devices. We developed thin-film, high performance absorbers in the visible, near-, mid-, long-wave - and far-IR region based on a 3 …
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Orders of Magnitude Enhancement of Optical Nonlinear Phenomena in Subwavelength Metal-Dielectric Gratings
… use of conjugate polymers, resonators, and metallic nanoparticles. In this thesis, the nonlinear enhancement properties of subwavelength metal-dielectric gratings are explored. Enhancement in nonlinearity by several orders of magnitude is achieved, with the enhancement entirely controlled by …
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Thermal transport across transfer printed metal-dielectric interfaces: Influence of contact mechanics and nanoscale energy transport
… thermal conductance of transfer printed metal-dielectric interfaces is ~45 MW/m2K at 300K, approaching that of interfaces formed using physical vapor deposition. In this work, we investigate this anomalous result using a combination of theoretical deformation mechanics and nanoscale …
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Towards quantum information processing with diamond color centers
… emitter spectrum. We introduce and optimize metal-dielectric nano-antenna designs recessed into a diamond substrate and aligned with quantum emitters. We analyze trade-offs between external quantum efficiency, collection efficiency, Purcell factor, and overall collected photon rate. This …
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Thermal boundary resistance
… below 0.2 K with present measurements on metal-dielectric interfaces and with previous measurements at liquid He-solid interfaces. The influence of the electron-phonon interaction on the thermal boundary resistance was studied experimentally, both as a phonon attenuating mechanism which …
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Controlling light on the nanoscale: ultrafast plasmonics and phase change functionality
… 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 optical pulses at wavelengths near the aluminium’s interband absorption …
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Nanophotonics for dark materials, filters, and optical magnetism
… perfect optical absorber based on a graphene/dielectric stack, an ultraviolet bandpass filter formed with an aluminum/dielectric stack, and structures exhibiting homogenizable magnetic properties at infrared frequencies. The graphene stack can be treated as a effective, homogenized medium that …
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Propagation, Scattering and Amplification of Surface Plasmons in Thin Silver Films
… a strong influence on the optical properties of metal micro- and nanostructures and are of great interest for novel photonic devices. Here, plasmons on metal-dielectric interfaces are investigated using near-field optical microscopy and differential angular reflectance spectroscopy. Emphasis is …
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DNA nanotechnology for light-emitting plasmonic applications
… Collective oscillations of electrons (SPPs) at a metal-dielectric interface confine light into nanometric spaces, sustaining an optical resonance. This resonance can be carefully tuned by changing the geometry and material of the gap. In this work, I use the NanoParticle-on-Mirror (NPoM) geometry …
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Grafeno ant skandžio oksido fotolitografija /
… out. The goal of the project is to obtain a metal-dielectric-semiconductor junction by replacing the metal with graphene due to its much better charge carrier transport properties than conventional metals. A graphene monolayer was set onto a 40nm thick scandium oxide (Sc2O3) layer using a wet …
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Time-domain Modeling of Light Matter Interactions in Active Plasmonic Metamaterials
… nanostructures and metamaterials, such as metal-dielectric composite films, random nano-nets for transparent conducting electrodes, and a graphene photodetector enhanced by a fractal plasmonic metasurface. In addition to this we also developed a multi-physics time-domain model to …
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Functional nanostructured plasmonic materials: fabrication, simulation, imaging and sensing applications
… to changes in refractive index occurring at a metal/dielectric interface and their ability to significantly enhance electromagnetic fields near a metal, offer exciting opportunities for real-time, fully label free forms of chemical/biological detection and field-enhanced applications including …
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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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All-optical metamaterial modulators : fabrication, simulation and characterization
… and rectangular holes penetrating through metal/dielectric/metal films. All three negative-index metamaterial structures exhibit similar figure of merit; however, the transmission is higher for the negative-index metamaterial with rectangular holes as a result of an improved impedance match …
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Homogenization of Structured Metasurfaces and Uniaxial Wire Medium Metamaterials for Microwave Applications
… media are crystals of various periodic metallic inclusions with dimensions of the order of ?/10 - ?/4. When compared to natural materials, the inclusions are, thus, not as small in terms of the wavelength, even in the optical band. Therefore, one should expect the electrodynamics of …
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Plasmonic devices for manipulating light at the nanoscale: slow-light waveguides and compact couplers
… The system consists of a periodic array of two metal-dielectric-metal (MDM) stub resonators side-coupled to a MDM waveguide. Decreasing the frequency spacing between the two resonances increases the slowdown factor and decreases the bandwidth of the slow-light band. I also show that there is a …
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