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Full-Text Articles in Physical Sciences and Mathematics
Two-Electrode Measurements Of Electrostatic Double Layer Potentials With Atomic Force Microscopy, Jason Giamberardino
Two-Electrode Measurements Of Electrostatic Double Layer Potentials With Atomic Force Microscopy, Jason Giamberardino
Theses and Dissertations
In this dissertation, I provide a thorough description of my development of theoretical, analytical, and experimental techniques pertaining to novel measurements of the electrostatic double layer (EDL) using atomic force microscopy (AFM), among other techniques. The EDL refers to the structure formed by ions that exists at the interface between a solid and a liquid. The EDL is an important physical element of many systems and its behavior has been of interest to scientists for many decades. Because many areas of science and engineering are moving to test, build, and understand systems at smaller and smaller scales, this work focuses …
Birefringence Microscopy With Magnetic-Field Aligned Multiferroic Janus Nanofibers, Yu-Chun Yeh
Birefringence Microscopy With Magnetic-Field Aligned Multiferroic Janus Nanofibers, Yu-Chun Yeh
Theses and Dissertations
Multiferroic Janus nanofibers consisting of barium titanate (BaT iO3) and cobalt ferrite (CoFe2O4) have the magnetoelectric effect between piezoelectric and magnetostrictive phases. By applying an external magnetic field on Janus nanofibers,the dipole moment in piezoelectric phase would be formed and produce the electric field. Since poly(N-vinylcarbazole) (PVK) polymer has anisotropic property, the birefringence can be induced by the electric field. We generalize the magnetic field birefringence quadratic equation and coupling constant for PVK polymer with Janus nanofibers. Birefringence microscopy is used to observe the PVK birefringence under an external magnetic field from 0 to 2500 Oe. The numerical results show …
Optical Investigation Of A Hybrid System Of Plasmonic Structures And Semiconductor Quantum Dots, Matthew B. Seaton
Optical Investigation Of A Hybrid System Of Plasmonic Structures And Semiconductor Quantum Dots, Matthew B. Seaton
Theses and Dissertations
Next generation integrated nanophotonic devices must fabricate large numbers of nanoscaled light coupling structures onto a single wafer: emitters such as quantum dots, resonators such as nanocavities and plasmonic nanoparticles, photonic crystal and nano-plasmonic waveguides, among others. Before precision planning and engi- neering will be possible a thorough understanding of the interaction between these structures must be documented. We present in this work an investigation of the interaction between quantum dots and plasmonic structures in the weak coupling regime. We found that surface plasmon supporting silver structures placed about 100nm from InGaAs quantum dots enabled an all optical polarization dependent …
Depairing Current Density In Nbtin Superconducting Films, Nahid Shayesteh Swails
Depairing Current Density In Nbtin Superconducting Films, Nahid Shayesteh Swails
Theses and Dissertations
In this work, we systematically investigate the superconducting properties of Niobium Titanium Nitride (NbTiN) superconducting films with different geometries, which at low temperature remain superconducting. NbT iN superconducting films with a few nm thickness are widely used in devices such as superconductor-insulatorsuperconductor (SIS) mixers, superconducting cavities and resonators and superconducting nanowire single-photon detectors (SNSPD). In all these applications, films of varying dimensions are required to achieve optimal performance. The initial thickness of our samples was 125 nm deposited on a silicon substrate. We change the thickness of our samples using lithography and ion milling. We measure and analyze the thickness …