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Dissertation
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Applied physics
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-
- Description:
- Two-dimensional (2D) materials and heterostructures have attracted significant attention for a variety of nanoelectronic and optoelectronic applications. At the atomically thin limit, the material characteristics and functionalities are dominated by surface chemistry and interface coupling. Therefore, methods for comprehensively characterizing and precisely controlling surfaces and interfaces are required to realize...
- Keyword:
- borophene, defect, scanning tunneling microscopy, heterostructure, two dimensional materials, and surface science
- Subject:
- Nanotechnology, Applied physics, and Materials Science
- Creator:
- Liu, Xiaolong
- Owner:
- Scholarly Digital Publishing
- Language:
- en
- Date Uploaded:
- 02/12/2020
- Date Created:
- 2018-01-01
- Resource Type:
- Dissertation
- Alternate Identifier:
- etdadmin_upload_622476 and http://dissertations.umi.com/northwestern:14423
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- Description:
- Electrochemical reactions on the nanoscale play a pivotal role in a variety of areas, including electrocatalysis, energy conversion and storage, corrosion prevention, plasmon driven chemistry, and so forth. An in-depth knowledge of how site-specific compositions and morphologies locally affect the electron transfer kinetics will greatly benefit the design of catalysts,...
- Keyword:
- Tip-Enhanced Raman Spectroscopy, Nanoscale, Scanning Tunneling Microscopy, Electrochemistry, Tip Functionalization, and Solid-Liquid Interface
- Subject:
- Physical chemistry, Applied physics, and Analytical chemistry
- Creator:
- Chen, Xu
- Owner:
- Scholarly Digital Publishing
- Language:
- en
- Date Uploaded:
- 02/12/2020
- Date Created:
- 2018-01-01
- Resource Type:
- Dissertation
- Alternate Identifier:
- http://dissertations.umi.com/northwestern:14437 and etdadmin_upload_625491
-
- Description:
- The structural aspects of biological systems are tightly paired with their functions. This understanding has been demonstrated over a broad range of length scales, spanning the ultrastructure of a cell to the macroscopic architecture of organs. Connecting structure and function relies on the integration of physical and biological sciences to...
- Keyword:
- Sparse imaging, 3D genome organization, Scanning transmission electron microscopy, Multi-modal chromatin characterization, and Electron tomography
- Subject:
- Mathematics, Applied physics, and Biophysics
- Creator:
- Li, Yue
- Owner:
- Scholarly Digital Publishing
- Language:
- en
- Date Uploaded:
- 02/12/2020
- Date Created:
- 2019-01-01
- Resource Type:
- Dissertation
- Alternate Identifier:
- http://dissertations.umi.com/northwestern:14813 and etdadmin_upload_685632
-
- Description:
- In this thesis, the optical gain mechanism in low-light conditions of phototransistor detectors (PTDs) is explored. An analytical formula is derived for the physical limit on the minimum number of detectable photons for PTDs. This formulation shows that the sensitivity of the PTD, regardless of its material composition, is related...
- Keyword:
- Phototransistor, Low-Dimensional photodetectors, InGaAs, Photodetector, Infrared Camera, and Short wave infrared
- Subject:
- Applied physics and Electrical engineering
- Creator:
- Rezaei, Mohsen
- Owner:
- Scholarly Digital Publishing
- Language:
- en
- Date Uploaded:
- 02/12/2020
- Date Created:
- 2018-01-01
- Resource Type:
- Dissertation
- Alternate Identifier:
- http://dissertations.umi.com/northwestern:14502 and etdadmin_upload_636639
-
- Description:
- This thesis forcuses on the development of the transition-edge sensor (TES) for various X-ray science applications, especially for synchrotron beamline experiments. The ultimate aim is to build a detector that has a higher energy resolution than semiconductor detectors, and a higher operation speed than crystal spectrometers. The possible applications include...
- Subject:
- Applied physics
- Creator:
- Yan, Daikang
- Owner:
- Scholarly Digital Publishing
- Language:
- en
- Date Uploaded:
- 02/12/2020
- Date Created:
- 2019-01-01
- Resource Type:
- Dissertation
- Alternate Identifier:
- etdadmin_upload_654970 and http://dissertations.umi.com/northwestern:14563
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- Description:
- The halide perovskites AMX3 (A = large cation, B = Sn or Pb, and X = halide) have been the subject of intense investigation due to their outstanding optical and electronic properties, which have enabled high solar cell efficiencies thanks to a beneficial electronic structure and long charge carrier lifetimes....
- Keyword:
- exciton, halide perovskite, semiconductor, radiation detector, and self-trapped exciton
- Subject:
- Inorganic chemistry, Applied physics, and Materials Science
- Creator:
- McCall, Kyle Matthew
- Owner:
- Scholarly Digital Publishing
- Language:
- en
- Date Uploaded:
- 02/12/2020
- Date Created:
- 2019-01-01
- Resource Type:
- Dissertation
- Alternate Identifier:
- http://dissertations.umi.com/northwestern:14511 and etdadmin_upload_638483
-
- Description:
- Transport along and across the grain boundaries of solid-state electrolytes has implications for a broad range of materials and in an equally broad range of technologies. Over the past 2-3 decades, a substantial body of literature has been developed to explain grain boundary transport properties within the context of space...
- Keyword:
- Grain Boundary Charge Transport, Oxide Electrolytes, Electron Holography, Impedance Spectroscopy, Atom Probe Tomography, and Space Charge Theory
- Subject:
- Applied physics and Materials Science
- Creator:
- Xu, Xin
- Owner:
- Scholarly Digital Publishing
- Language:
- en
- Date Uploaded:
- 02/12/2020
- Date Created:
- 2019-01-01
- Resource Type:
- Dissertation
- Alternate Identifier:
- http://dissertations.umi.com/northwestern:14848 and etdadmin_upload_686556
-
- Description:
- Low-dimensional materials have emerged as a promising platform for ultrathin electronic and optoelectronic devices. The span of electronic properties covers the spectrum from metallic through small and medium bandgap semiconductors to large bandgap insulators, providing all the necessary components to fabricate a variety of devices. Compared to bulk-semiconductor based devices,...
- Keyword:
- Gaussian, self-aligned, spiking neuron, antiambipolar, low-dimensional materials, and van der Waals heterojunction
- Subject:
- Applied physics, Electrical engineering, and Materials Science
- Creator:
- Beck, Megan
- Owner:
- Scholarly Digital Publishing
- Language:
- en
- Date Uploaded:
- 04/29/2020
- Date Created:
- 2020-01-01
- Resource Type:
- Dissertation
- Alternate Identifier:
- http://dissertations.umi.com/northwestern:14986 and etdadmin_upload_717678
-
- Description:
- Water vapor condenses into liquid water when it encounters a cold surface. If the surface temperature is sufficiently low, freezing follows the condensation step, and the process is holistically referred to as condensation frosting. Both phase change processes are fundamental to many industries ranging from water harvesting, thermal management, solar...
- Keyword:
- Frosting, Condensation, Phase Change, Mass Transport, Diffusion, and Droplet
- Subject:
- Applied physics and Materials Science
- Creator:
- Yao, Yuehan
- Owner:
- Scholarly Digital Publishing
- Language:
- en
- Date Uploaded:
- 04/29/2020
- Date Created:
- 2020-01-01
- Resource Type:
- Dissertation
- Alternate Identifier:
- http://dissertations.umi.com/northwestern:14997 and etdadmin_upload_718499
-
- Description:
- Physiochemical phenomena in aqueous systems, such as corrosion, catalysis, and energy storage, are driven by the molecular-scale interactions of ionic species with charged solid surfaces. In particular, an electrical double layer (EDL) of ions forms within nanometers of a charged surface. The properties of the EDL have been explored from...
- Keyword:
- Electrical Double Layer, First Principles Molecular Dynamics, X-ray Reflectivity, Solid/Water Interfaces, and Resonant Anomalous X-ray Reflectivity
- Subject:
- Applied physics and Materials Science
- Creator:
- Harmon, Katherine
- Owner:
- Scholarly Digital Publishing
- Language:
- en
- Date Uploaded:
- 04/15/2021
- Date Created:
- 2021-01-01
- Resource Type:
- Dissertation
- Alternate Identifier:
- http://dissertations.umi.com/northwestern:15471 and etdadmin_upload_796475
-
- Description:
- Miniaturized lasers are important for fundamental studies of light-matter interactions and applications in on-chip photonic integration. Plasmonic nanoparticle lattices supporting surface lattice resonances can provide optical feedback for directional lasing emission at room temperature. This thesis focuses on how the design of plasmon cavities can enable engineering of laser emission...
- Keyword:
- Nanolasers, Colloidal quantum dots, Surface lattice resonances, Brillouin zone, Plasmons, and Nanophotonics
- Subject:
- Applied physics
- Creator:
- Guan, Jun
- Owner:
- Scholarly Digital Publishing
- Language:
- en
- Date Uploaded:
- 06/28/2021
- Date Created:
- 2021-01-01
- Resource Type:
- Dissertation
- Alternate Identifier:
- http://dissertations.umi.com/northwestern:15581 and etdadmin_upload_819603
-
- Description:
- Additive manufacturing (AM) offers exciting advantages for the fabrication of metallic parts compared to traditional techniques, such as the ability to create complex geometries with less material waste. This is done by building arbitrary geometries in a layer-by-layer fashion, thereby giving the designer great control over the design of the...
- Keyword:
- Data-driven Modeling , Computational Fluid Dynamics, Finite Element Modeling, Additive Manufacturing, and Computational Mechanics
- Subject:
- Applied physics and Mechanical engineering
- Creator:
- Jones, Kevontrez
- Owner:
- Scholarly Digital Publishing
- Language:
- en
- Date Uploaded:
- 06/28/2021
- Date Created:
- 2021-01-01
- Resource Type:
- Dissertation
- Alternate Identifier:
- etdadmin_upload_807301 and http://dissertations.umi.com/northwestern:15507
-
- Description:
- Coherent diffractive imaging (CDI) methods are techniques that image a sample by illuminating it with a coherent beam and recording the intensity diffraction pattern produced by the wavefront outgoing from the sample. These are lensless methods that are not limited in resolution by the physical characteristics of an objective lens,...
- Subject:
- Applied physics and Physics
- Creator:
- Kandel, Saugat
- Owner:
- Scholarly Digital Publishing
- Language:
- en
- Date Uploaded:
- 10/07/2021
- Date Created:
- 2021-01-01
- Resource Type:
- Dissertation
- Alternate Identifier:
- http://dissertations.umi.com/northwestern:15629 and etdadmin_upload_830433
-
- Description:
- Light provides a high-speed and coherent medium for controlling quantum states. In semiconductors, coherent optical effects have been used extensively to lift spin degeneracy on ultrafast timescales and demonstrate high-fidelity control of quantum spin states. Extending this approach to novel pseudospins in monolayer transition metal dichalcogenides (TMDs), in this thesis...
- Keyword:
- Polariton, ultrafast optics, exciton, Stark effect, valley, and two-dimensional materials
- Subject:
- Optics, Applied physics, and Condensed matter physics
- Creator:
- LaMountain, Trevor
- Owner:
- Scholarly Digital Publishing
- Language:
- en
- Date Uploaded:
- 10/07/2021
- Date Created:
- 2021-01-01
- Resource Type:
- Dissertation
- Alternate Identifier:
- etdadmin_upload_838864 and http://dissertations.umi.com/northwestern:15680
-
- Description:
- My research goal is to develop first principles frameworks to interrogate multiphase, multiscale systems. One of my main focus areas is to consistently deconstruct highly nonequilibrium problems into their fundamental components. By using analytical, computational and experimental tools to grasp the key levers controlling such phenomenon, I aim to build...
- Keyword:
- Applied Math, Nonequilibrium Thermodynamics, Phase Instability, Statistical Mechanics, and Molecular Dynamics
- Subject:
- Applied physics
- Creator:
- Zhao, Tom
- Owner:
- Scholarly Digital Publishing
- Language:
- en
- Date Uploaded:
- 10/07/2021
- Date Created:
- 2021-01-01
- Resource Type:
- Dissertation
- Alternate Identifier:
- etdadmin_upload_845599 and http://dissertations.umi.com/northwestern:15777