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- 1Achal, Roshan
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- 46Graduate and Postdoctoral Studies (GPS), Faculty of
- 46Graduate and Postdoctoral Studies (GPS), Faculty of/Theses and Dissertations
- 1Digital Humanities Program
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Spring 2020
On a perfect hydrogen-terminated Si(100)-2x1 surface, each surface silicon atom is capped with exactly one atom of hydrogen. When one of the capping hydrogen atoms is removed, the now unsatisfied orbital of the underlying silicon atom is exposed at that site. This site is better known as a...
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Fall 2011
This work investigates the use of nanoimprint lithography for creating nanoscale resonator devices for applications in mass sensing. A bilayer resist consisting of PMMA 495/LOR 3A allowed the ideal imprint yield for resonators with widths ranging from 300 nm down to 120 nm. Resonators with...
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Spring 2016
This thesis explores the dynamics and sensing performance of silicon quantum dot (SiQD) ensembles coupled to the whispering gallery modes (WGMs) of spherical and cylindrical microcavities. The first project investigated the possibility of observing Purcell effects in an ensemble of QDs coupled to...
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Spring 2015
This thesis focuses on the photoluminescence (PL) of free-standing silicon quan- tum dots (QDs). Large changes in the emission spectrum were found to occur when the QDs were exposed to different environments while undergoing short-wavelength laser irradiation, a phenomenon that was the main focus...
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Fundamentals of Film Growth by Glancing Angle Deposition for Inorganic and Inorganic/Liquid Crystal Hybrid Optical Systems
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This thesis investigates two facets of thin film growth via glancing angle deposition. The first half of the work focuses on the fundamentals of film growth with a focus on uniformity and optical design. This portion of the thesis addresses important engineering questions that are relevant to...
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Fall 2017
Despite offering advantages such as physical flexibility and cost-effectiveness, thin-film optoelectronic devices are held back by their lackluster efficiency in competition with their traditional counterparts. Since one major factor in low performance of these devices is known to be their...
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High Surface Area Nanoelectromechanical Systems via the Integration of Glancing Angle Deposition Thin Films
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High surface area nanoelectromechanical systems (NEMS) are fabricated using glancing angle deposition (GLAD) thin films as the high surface area layer. The GLAD films are deposited on already-released NEMS cantilevers and doubly clamped beams (DCBs) with good uniformity. The resonance frequencies...
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Interfacing Silicon-Based Quantum Dots with Proteins for Biological and Sensing Applications
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This dissertation presents the preparation of functional bioinorganic hybrids from silicon-based quantum dots (SiQDs) and enzymes and the use of SiQDs and green fluorescent protein as ratiometric photoluminescent sensors for nerve agents. Chapter 2 discusses the preparation of water-soluble...
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Fall 2010
This thesis describes the fabrication and characterization of integrated hollow Bragg waveguides fabricated by controlled thin film buckling. Hollow waveguides based on two different set of materials were studied. In the first case, thermal tuning of air-core dimensions was studied using...