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 18 of 18 for “"nanopillar"”.
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Spin transport through nanopillar superconducting spin valves
… into current-perpendicular-to-plane (CPP) nanopillars using optical lithography and Ar ion milling followed by focused ion beam milling. Magnetic and electrical characterisation of these devices at temperatures between 0.3-10 K demonstrate a decrease of magnetoresistance (increasing spin …
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Scalable Electrochemical Surface Enhanced Raman Spectroscopy (EC-SERS) for bio-chemical analysis
Conducting vertical nanopillar arrays can serve as three-dimensional nanostructured electrodes with improved performance for electrical recording and electrochemical sensing in bio-electronics applications. However, vertical nanopillar-array electrodes made of inorganic conducting materials by …
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Remote-Controlled Self-Assembly of Three-Dimensional Micro Structures for Ultra-Sensitive Sensors and Three-Dimensional Metamaterials
… increase Q-factor of the MMs, we developed novel nanopillar-based MMs driven by displacement current. The nanopillar-based MMs contain thousands of metallic nanopillars with nanoscale dielectric gaps between them. Forming the MMs with nanopillars and nano gaps decreases the Ohmic energy loss in …
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Atomistic Modeling of Nanostructures via Molecular Dynamics and Time-Scaling Methods
… way of different atomistic simulation methods. Nanopillar compression is first used to investigate the interplay between size effects associated with the twin spacing and the finite size of nanopillars by molecular dynamics. Simulations reveal that there exists an optimal aspect ratio for which …
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Laterally confined THz sources and graphene based THz optics
… performance. Lithographically defined vertical nanopillar arrays with electrostatic radius less than tens of nm offer a possible route to achieve lateral confinement, which can be integrated into QCL structures. A typical gain medium in a QCL consists of at least 100 repeat periods, with a …
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Nanoengineered surfaces for advanced thermal management
… fluid interactions on surfaces with micro- and nanopillar arrays with diameters and spacings ranging from 500 nm to 10 [mu]m. First, liquid transport studies were performed where a propagating liquid on an array of pillars with scalloped features can separate into multiple layers of liquid …
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Block copolymer self-assembly : lithography, magnetic fabrication, and optimization
… wires are investigated. For perpendicular MTJ nanopillar arrays, the size-dependent switching behavior and magnetostatic effects between two layers are analyzed. MoS 2 monolayers are patterned into features such as nanodots, nanorods and nanomeshs and the corresponding photoluminescence are …
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Geometry Dependent Plasmonic Activities of a Self-assembled Hexagonal Lattice and a Periodic Hexagonal Lattice with Gold Nanopillars
… nanobeads were used to obtain real values for nanopillar centers which were required to develop a computer algorithm to create replicas of a self-assembled hexagonal lattice. A simulation tool, EM Explorer, was used to study the plasmonic activities of the self-assembled hexagonal lattice and a …
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The tin-vacancy centre in diamond: a coherent spin-photon interface for quantum network nodes
… For a low-strain tin-vacancy centre in a diamond nanopillar device, we show polarisation of more than 65 % of a strongly coupled 13C nuclear spin. We find that optically induced laser-detuning independent dephasing limits the gate fidelities of the all-optical stimulated Raman drive, confirming …
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Multiphysics simulations of magnetic nanostructures
… spring system in the form of a cylindrical nanopillar, it is possible to obtain microwave emission with frequencies of 5-35 GHz for applied current densities between 0.5-2.0 x 10<sup>11</sup> A/m<sup>2</sup> and without the need for an externally applied magnetic field. We proposed a one …
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Spin-mixing and transport through superconducting interlayers in ferromagnetic Josephson junctions
… In this thesis I investigate ferromagnetic nanopillar Josephson devices with different types of ferromagnetic barriers,incorporating spin-mixer interfaces and Rashba spin-orbit coupling. The research focuses on equilibrium spin-transport through intermediary superconducting regions for which …
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Fabrication of high aspect ratio silicon nanostructure arrays by metal-assisted etching
… we demonstrated the fabrication of a silicon-nanopillar-based nanocapacitor array using metal-assisted etching and electrodeposition. The capacitance density was increased significantly as a result of an increased electrode area made possible by the catalytic etching approach. We also showed …
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Enhance of LCOS Phase Modulation in Visible Wavelength Range Based on Metasurface
… a metasurface (composed of a subwavelength TiO₂ nanopillar array with a size gradient) partially transfers the phase depth modulation requirements from the liquid crystal layer. The design exploits the electrically controlled birefringence (ECB) mode for continuous tuning of the refractive index …
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Multimodal Optical Interfaces Enabled by Multiresonant Plasmonics for Bio-Nanophotonics
… (MIM) plasmonic nanolaminate nanopillar arrays (NLNPAs), which provide tunable multiresonant responses, nanoscale mode overlap, and an intimate bio-nano interface. For biochemical sensing, the multiband plasmonic resonances enable broadband surface-enhanced Raman scattering …
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Vertically and Horizontally Self-assembled Magnetoelectric Heterostructures with Enhanced Properties for Reconfigurable Electronics
… single crystal substrate PMN-30PT, with a CFO nanopillar and SRO matrix. In such a heterostructure, the SRO would serve as the conductive materials, while CFO offers the insulated property. This unique conductive/insulating heterostructure could be deposited on PMN-PT single crystals, thus …
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Development of nanoplasmonic devices for biosensing applications
… dissertation, including a metal-insulator-metal nanopillar device for surface enhanced Raman spectroscopy sensing. In each case, the sensing method is critically studied and the device is optimized. The plasmon-photon interaction in the multilayered system is examined in detail and it is shown …
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Development of High-Performance Optofluidic Sensors on Micro/Nanostructured Surfaces
… can be controlled and regulated by tailoring the nanopillar structures and their associated hydrophobicity. The nanostructured superhydrophobic chip surface and its impact on the microdroplet morphology are modeled by Surface Evolver (SE), which is subsequently validated by the Cassie-Wenzel …
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Critical Current Enhancement In Magnetic Spin-Transfer Nano-Devices Through Doping With The Rare Earth Terbium
In this thesis, we fabricate magnetic nanopillars and dramatically enhance their damping through terbium doping in order to suppress the various spin-transfer effects, to the potential benefit of magnetic hard drive read head technology. This enhancement is much stronger at lower temperatures, and …