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 “"anomalous dispersion"”.
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Ultracold quantum gases in one-dimensional optical lattice potentials : nonlinear matter wave dynamics
… potential allows to modify the linear wave dispersion. We realized dispersion management by switching from normal to anomalous dispersion during the evolution. In this way the initial expansion of a wave packet is reversed to a compression and thus the effective spreading can be suppressed. …
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Slow and fast light by spectral hole-burning in the solid state
… in materials that have very large normal or anomalous dispersion. In this thesis, methods that can be used to generate subliminal and superluminal light, especially the spectral hole-burning technique are reviewed and applied in the experiments. The experimental studies conducted are based on …
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Holey optical fibres for high nonlinearity devices
… confinement losses, high birefringence and high anomalous dispersion at the operating wavelength. The negative impact of anomalous dispersion on the BER performances of a wavelength converter, and the limitations in terms of wavelength tuning range and phase matching of a high dispersion HF, …
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Finite Element Analysis Of Left-handed Waveguides
… with finite element method resulting in the dispersion relation of the waveguides is adopted in the analysis. Detailed methodology of one-dimensional scalar and two-dimensional vector finite element formulation for the analysis of grounded slab and arbitrary shaped waveguides is presented. …
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Assessment of colloidal self-assembly for photonic crystal
… optical switch and sensors. Besides, the anomalous dispersion characteristic near to the band edges or near to flat bands of the photonic band diagram is suited for superprism and light harvesting applications. Potentially, the unique characteristics of colloidal photonic crystal could be …
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Structure of T6SS components and assessment of potential Gram-ve drug targets
… of SmLip was determined using single-wavelength anomalous dispersion methods targeting iodides that were present in the crystallisation solution. The structure was refined to 1.92 Å and displays a fold similar to that of transthyretin; a protein that binds the hormone thyroxine. Despite the …
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Anomalous Wave Dispersion in the Cyclohexanedione-Bromate Chemical Oscillator
… (CHD-BZ) reaction. The phenomena of anomalous velocity dispersion (in which following waves may catch up to, rather than fall behind an initial excitation wave), wave-stacking, and backfiring have been successfully reproduced numerically as resulting from non-monotonic …
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Anomalous Wave Dispersion in the Cyclohexanedione-Bromate Chemical Oscillator
… (CHD-BZ) reaction. The phenomena of anomalous velocity dispersion (in which following waves may catch up to, rather than fall behind an initial excitation wave), wave-stacking, and backfiring have been successfully reproduced numerically as resulting from non-monotonic …
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Crystallographic studies on enzymatic halogenation of natural products
… selenomethionine labeling and single wavelength anomalous dispersion (SAD) techniques. These structures show an overall cupin or [beta]-sandwich fold and a novel iron binding motif containing a naturally occurring iron-chloride bond. The carboxylate ligand typically found in non-heme iron …
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Biophysical analysis of MarR family transcription factors from Streptomyces coelicolor
… Sco4122 and Sco5413, have been determined using anomalous dispersion methods. The structure of Sco5413 was determined to 1.25 Å resolution, the highest resolution for an MFR at this point. Genetic and biophysical analyses of these transcription factors have also been performed and the DNA …
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Structures of lanthanide-edta complexes
… and three water molecules. For each structure, anomalous dispersion corrections were applied since Fdd2 is a polar space group. The molecules of water of crystallization were seen to be partially disordered. The structures of the complexes K⁺[Ln(edta)(H₂O)₂ ].4H₂O for Ln =Erbium and Ytterbium …
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Numerical modeling of nonlinear mode interaction in semiconductor lasers and amplifiers to generate slow/fast light
… emission (also known as critically anomalous dispersion (ng = 0)), where ng is the group index. In the nonlinear interaction (NLI) mechanism, the interaction between a driving wave (mode) which is of sufficiently high intensity, and a probe wave (mode) results in modification of …
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Structural analysis of LMO2 for the development of a small molecule inhibitor
… of 3.3Å, using phase information from single anomalous dispersion (SAD) data in combination with molecular replacement. Using a mammalian two-hybrid mutagenesis screen, key VH#576 binding residues have been identified. This data can be used, in combination with the crystal structure of …
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Structure Determination of Viscotoxin A1, Tendamistat and Tri Peptidyl peptidase-I
… der Schwefelatome per SAD ("single wavelength anomalous scattering") mit Daten von einer Drehanodenanlage gelöst. Viscotoxin A1 weist wie viele Viscotoxine die für Thionine typische Tertiärstruktur auf. Eine positiv geladene Tasche, die ein funktionell essentielles Phosphation bindet, fehlt in …
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Engineering the optical properties of subwavelength devices and materials
… a high refractive index, low refractive index, anomalous dispersion, or normal dispersion, all with optical transparency. In the second half, we studied the optical properties of SNSPDs through theoretical and experimental methods. In the study, we first constructed a numerical model that …
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Analysis and Characterization of Fiber Nonlinearities with Deterministic and Stochastic Signal Sources
… with eye-opening penalty in the normal dispersion region over a wide range of parameters, but over a more limited range in the anomalous dispersion region. The cross-phase modulation (CPM) penalty in a multi-channel system is also studied using the sinusoidally modulated input signal. …
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Crystallographic studies on diheme cytochrome <i>c</i> enzymes
… Struktur von RoxA wurde durch Multiwavelength Anomalous Dispersion-Phasierung (MAD) gelöst und bis zu einer Auflösung von 1.8 Å verfeinert. In den Datenbanken wurden keine Strukturen gefunden, die eine signifikante Ähnlichkeit zu der Gesamtstruktur von RoxA zeigen. Allerdings weist der Bereich, …
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The development of high power, pulsed fiber laser systems and their applications
… contrast in such fibers can create a strong (anomalous) waveguide contribution to the dispersion, and such HFs can have anomalous dispersion at wavelengths <1.3 µm, where conventional fiber has normal dispersion. Therefore HFs can support solitons in new wavelength bands. This thesis reports …
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Fabrication and applications of lead-silicate glass holey fibre for 1-1.5 microns: nonlinearity and dispersion trade offs
… HFs: propagation loss, fibre nonlinearity and dispersion. There had been little development towards SG-HF fabrication techniques that could be used to produce good quality fibres, nor the characterisation techniques that could be used to accurately measure the optical properties. Both the …
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Optical frequency comb generation in optical fibres
… pumped amplifying Erbium-doped fibre with anomalous dispersion, and the third one is a low-dispersion highly nonlinear optical fibre. The evolution of a frequency comb in this system is governed by the following processes: as the two initial CW-laser waves with different frequencies …