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 142 for “"Optical Spectroscopy"”.
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Optical spectroscopy of conjugated polymers.
I have conducted studies of the optical properties of two model conjugated systems (poly-(p-phenylenevinylene) and a set of zinc-centred oligo-(porphyrins) ). Various optical probing techniques have been employed to study the nature and behaviour of the primary photoexcited state of …
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Optical spectroscopy of HMX reaction regimes
… indirectly from the results gained from using optical spectroscopy. Two different impact initiated deflagration reactions were performed. Improvements were made to the fallhammer sensitivity test to allow for more quantitative measurements, and the Split Hopkinson Pressure Bar (SHPB) was used …
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Nonlinear Optical Spectroscopy of Gallium Arsenide Interfaces
… reasons. In this thesis, second-order nonlinear optical spectroscopy was used to probe the electronic structure of GaAs based interfaces in the near infrared. Second-order nonlinear optical spectroscopy possesses intrinsic interface sensitivity and a long penetration depth. This intrinsic …
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Glow Discharge Optical Spectroscopy for Sputtering Diagnostics
Made available in DSpace on 2014-12-14T16:00:38Z (GMT). No. of bitstreams: 1 7821244.pdf: 6923671 bytes, checksum: 475e29fa7d2f2ca6284d17d4b17fe33a (MD5) Previous issue date: 1978
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Computational and statistical approaches to optical spectroscopy
Compact and smart optical sensors have had a major impact on people's lives over the last decade. Although the spatial information provided by optical imaging systems has already had a major impact, there is untapped potential in the spectroscopic domain. By transforming molecular information into …
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Optical Spectroscopy for Process Monitoring of 238Pu Production
… techniques must be developed. The efficacy of optical spectroscopic techniques have been studied to improve process monitoring capabilities of plutonium production. Raman spectroscopy and laser-induced breakdown spectroscopy calibration models have begun development for active determination of …
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Ultrafast Optical Spectroscopy Techniques applied to colloidal nanocrystals
… describe my experimental work based on ultrafast optical spectroscopy techniques applied to colloidal nanocrystals. Colloidal semiconductor nanocrystals in recent years have attracted a lot of attention in particular in optoelectronic applications, because they present unique optical, electronic …
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Investigating exciton correlations using coherent multidimensional optical spectroscopy
The optical measurements described in this thesis reveal interactions among bound electron-hole pairs known as excitons in a semiconductor nanostructure. Excitons are quasiparticles that can form when light is absorbed by a semiconductor. Exciton interactions gained prominence in the 1980s when …
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Probing cardiac calcium regulation using time-resolved optical spectroscopy.
… measurement of their physical interactions using optical spectroscopy. We have used time-resolved fluorescence resonance energy transfer (TRFRET) to determine the binding and distance distribution between the donor-labeled SERCA and acceptor-labeled SERCA-bound PLB in artificial membranes. Results …
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Mapping cerebral blood flow with speckle contrast optical spectroscopy
… of cerebral hemodynamics, yet the existing optical neuroimaging modalities to measure CBF do not have sufficient signal-to-noise ratio. Speckle contrast optical spectroscopy (SCOS) has been previously considered as an alternative approach to use near-infrared light to measure CBF …
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Complex Phase Behavior of Exotic Oxides: Optical Spectroscopy Studies
We observed that the metal-insulator transition in Ca3Ru 2O7 is characterized by the opening of correlation charge gap. The out-of-phase c-axis oxygen vibration phonon mode is seen to be closely associated with the metal-insulator transition possibly by modulating the bandwidth of the system. We …
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Complex phase behavior of exotic oxides: optical spectroscopy studies
"We have used two optical spectroscopy techniques, Raman scattering spectroscopy and spectroscopic ellipsometry, to study complex phase transition behavior exhibited by the doped rare-earth manganese oxides, R1_xDxMn03 (0 :::; x :::; 1), and the layered calcium ruthenium oxide, Ca3Ru20 7 , in which …
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DEGENERATE SECOND ORDER NONLINEAR OPTICAL SPECTROSCOPY OF CHIRAL WEYL SEMIMETALS
… thesis focuses on the development of nonlinear optical techniques and the measurement of topological properties of the Weyl semimetals. The first portion of this thesis describes technical developments of the nonlinear optical spectroscopic probes rotational anisotropy second harmonic generation …
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Optical spectroscopy of single-walled carbon nanotubes in high magnetic fields
Magnetic flux threading a single-walled carbon nanotube (SWNT) is predicted to influence its electronic structure through the Aharonov-Bohm (AB) effect, causing bandgap oscillations and absorption peaks splitting. In order to verify these predictions, near infrared (NIR) photoluminescence (PL) and …
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Halide Perovskite and Perovskite-Inspired Light Emitters: Synthesis and Optical Spectroscopy
… In addition, structural and resulting optical instabilities have yet prevented the fabrication of an electroluminescent, white light-emitting diode composed of a red-, green-, and blue-emitting lead halide perovskite layer. In this thesis, the fabrication and optical characterisation of …
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Multi-pulse nonlinear optical spectroscopy and light-matter interactions in layered materials.
… applications from solar energy conversion to optical sensing of biological materials. The use of multiple pulses to study these interactions are especially useful in understanding the nonlinear optical properties of materials. Transition metal dichalcogenides such as molybdenum disulfide …
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Characterizations on bacterial photosynthesis and respiration with optical spectroscopy and magnetic resonance
Photosynthesis and respiration are key energetic transductions. Both processes involve downhill electron transfers within transmembrane protein complexes. Here, I have examined different physical aspects of photosynthetic and respiratory electron transfer. For the photosynthesis section, I have …
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Optical spectroscopy study of correlated electron physics in ABC-stacked trilayer graphene
… which focuses on the low-frequency response, the optical spectrum is an important way to detect the frequency-dependent response and extract the underlying physics. In this project, we measured the optical spectrum on an ABC-stack trilayer graphene sample with the photocurrent method to understand …
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Characterising radio sources in the Small Magellanic Cloud using citizen science and optical spectroscopy
… This was approached using citizen science and optical spectroscopic follow-up. From the 10873 radio sources, 1429 were selected as subjects for classification in the citizen science project. This selection was based on the radio signal-to-noise ratio. The citizen science approach used …
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