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 20 for “"Enhanced absorption"”.
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Laser-induced plasmas in air for pulsed broadband cavity-enhanced absorption spectroscopy
… from the cavity was used to measure broadband absorption spectra of gaseous azulene through (i) time-dependent cavity ring-down (CRDS), and (ii) intensity-dependent incoherent broadband cavity-enhanced absorption spectroscopy (IBBCEAS) methodologies. Based on the broadband ring-down time of …
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A single ion inside a miniature cavity
… interaction strength, i.e. we observe strongly enhanced absorption by the ion when a faint probe beam is injected into the cavity mode. The novel cavity-ion geometry advances the prospects to reach the strong-coupling regime with single ions and the feasibility of a distributed ion-based quantum …
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Designing switchable solvents for sustainable process development
… used to develop next generation materials with enhanced absorption capacities. The viscosity of the solvents, as a function of temperature and composition, is also presented.
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Preparation of nanovehicles for targeted drug delivery
… and targeted delivery of drugs for selective and enhanced absorption. This work throws light on the preparation of biodegradable and non-toxic nanoparticulate systems for targeted drug delivery. The drug vehicles were made by two different processes namely electrostatic interactions and …
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A System for Measuring Radiation Induced Chemical Products in Atmospheric Gases Using Optical Detection Methods
… formation as well as an explanation of Cavity Enhanced Absorption Spectroscopy and Cavity Ringdown Spectroscopy. This is followed by a description of the optical and vacuum systems that were available and the modifications required to integrate the optical system into the vacuum chamber to …
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Enhancing Gas Absorption with Nanoengineered Surfaces for Bubble Manipulation
… the efficacy of a novel method for gas absorption into a liquid absorbent, which involves using nanoengineered surfaces to spread bubbles into their texture and enhance mass transport between the gas and liquid phases. This surface-enhanced direct injection approach for gas absorption …
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Cavity Ringdown Spectroscopy in Nitrogen/Oxygen Mixtures in the Presence of Alpha Radiation
… formation, along with explanations of Cavity Enhanced Absorption Spectroscopy and CRDS. This is followed by a description of the existing vacuum and optical system, as well as the modifications required to integrate the mass spectrometer and dye laser. Another chapter details the modifications …
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Design of Multilayer Optical Media: Organic Photovoltaics and Optical Data Storage
… optical cavity formed by these electrodes causes enhanced absorption. By carefully designing the layer thicknesses, the absorption in the semiconductor layer can be tuned. In addition, the total absorbed solar photons vary as functions of the layer thicknesses requiring optimization by calculation …
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Chamber investigations of atmospheric mercury oxidation chemistry
… to make a portable Hg sensor based on Cavity Enhanced Absorption Spectroscopy (CEAS). The detection limit achieved was 66 ngm−3 for a 10 second averaging time. The second part of this work describes experiments carried out in a temperature controlled atmospheric simulation chamber in the …
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Absorption-Dominant Electromagnetic Interference Shielding Polymer Composites and Foams
… foams offers a promising solution for achieving absorption-dominant electromagnetic interference (EMI) shielding while mitigating secondary electromagnetic pollution. Despite the significance of structural and geometrical factors in creating high-performance absorption-dominant EMI shielding …
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Effects of Aqueous Organic Coatings on the Interfacial Transport of Atmospheric Species
… into these processes. Gas and solution phase absorption spectroscopy were used to study the effect of octanol coatings on the formation of molecular iodine (I2) by the heterogeneous ozonation of iodide and its partitioning between phases. Compared to uncoated solutions, the presence of octanol …
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Broadband Coherent Perfect Absorption in One-Dimensional Optical Systems
<p>Absorption plays a critical role in a variety of optical applications – sometimes it is desirable to minimize it as in optical fibers and waveguides, or to enhance it as in solar cells and photodetectors. We describe here a new optical scheme that controllably produces high optical absorption …
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Supercontinuum radiation for ultra-high sensitivity liquid-phase sensing
… (SC) radiation used for liquid-phase absorption for the first time. Firstly, supercontinuum cavity enhanced absorption spectroscopy (SC-CEAS) was used for the kinetic measurement of chemical species in the liquid phase using a linear optical cavity. This technique is simple to …
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Theoretical Investigations of the Photophysical Properties of Chromophoric Metal-Organic Frameworks
… the following approach to increase the light absorption and the electronic band dispersion. Firstly, we proposed a computationally feasible simplified time-dependent approach to investigate the light absorption properties of PP derivatives or related PP-containing materials. Secondly, we …
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Exploring excitations and vibrations in semiconductor nanocrystals through fluorescence and Raman spectroscopy
… QD films. Several possible effects, including an enhanced absorption cross section, ordered dipole orientations, or dipole-multipole coupling, can explain the observed difference between our measurements and the Förster theory predictions, demonstrating that several standard assumptions commonly …
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Characterization of, and novel architectures for, strained-layer superlattice infrared photodetectors
… this dissertation proposes an architecture for enhanced absorption in ultra-thin strained-layer superlattice detectors utilizing a hybrid optical cavity design. The proposed detector architecture utilizes a highly doped semiconductor ground plane beneath the ultra-subwavelength thickness …
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Broadband High Efficiency Fractal-Like and Diverse Geometry Silicon Nanowire Arrays for Photovoltaic Applications
… to reduce the optical losses and to enhance the absorption of light in thin film PVSC. One promising technique is the nanowire (NW) arrays in general and the silicon nanowire (SiNW) arrays in particular.</p> <p>The purpose of this research is to introduce vertically aligned SiNW arrays with …
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Exploiting Optical Contrasts for Cervical Precancer Diagnosis via Diffuse Reflectance Spectroscopy
… based optical toolbox can be used to extract absorption and scattering contrasts from diffuse reflectance acquired in the cervix in vivo. [Total Hb] was shown to increase significantly in high-grade cervical intraepithelial neoplasia (CIN 2+), clinically the most important tissue grade to …
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Optoperforation of Intact Plant Cells, Spectral Characterization of Alloy Disorder in InAsP Alloy Disorder in InAsP Alloys, and Bimetallic Concentric Surfaces for Metal-Enhanced Fluorescence in Upconverting Nanocrystals
… characterization of alloy disorder, and metal-enhanced fluorescence were applied to previously unconsidered or disregarded systems in order to demonstrate that such applications are both feasible and consequential. These applications were the subject of three disparate works and, as such, are …
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The Design, Synthesis and Study of Mixed-Metal Ru,Rh and Os, Rh Complexes with Biologically Relevant Reactivity
… and studied by electrochemistry, electronic absorption spectroscopy, ESI-mass spectrometry, steady-state and time-resolved emission spectroscopy. Ï¿" ï¿" The electrochemical properties of bimetallic complexes with polyazine ligands exhibit a reversible one-electron metal-based oxidation, a …