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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 66 for “"Kerr effect"”.
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Dielectric and Kerr Effect Studies of Electro-Active Polymer Complexes
… of static dielectric permittivities and Kerr constants. Experimental molar Kerr constants have been derived for the complexes and compared to theoretical values calculated using bond and group polarizabilities taken from the literature. The experimental molar Kerr constants were in …
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The temperature dependence of the electro-optic kerr effect in solutions
A novel Kerr cell of greater optical path length and temperature stability has been designed and built. The Kerr effect experimental has been substantially automated using an Apple IIe computer. Software has been written allowing the computer to partially control the Kerr effect equipment and to …
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Low temperature Kerr effect study of magnetic topological insulators and other magnetic structures
… presented, with an emphasis on the magneto-optic Kerr effect (MOKE) characterisation. The design and construction of a MOKE microscope is described, for simultaneous magneto-optical and magneto-transport measurements in an applied field of up to 9 T at temperatures from 1.5 to 300 K. This …
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Dipole moments and Kerr effect of poly(n-vinylcarbazole) and its complexes with trinitrofluorenone
… permittivity and electro-optical birefringence (Kerr effect) in solution in 1,4-dioxane were carried out over a range of temperatures. The magnitudes of the dipole moments and Kerr constants were found to vary with changes in the tacticity of poly(N-vinylcarbazole). The results of these …
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Analysis and simulation of the Kerr effect in long haul in-line fiber amplifier transmission systems
… numerical simulation and experiments, that the Kerr effect has the most significant degradation effects on these systems with a single or a few channels. In this dissertation, the numerical simulation is the principal approach but this is supplemented with some analytical studies. There are two …
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Ferromagnetism of novel ultrathin films and multilayers: A study of Ru/C(0001) and Fe/Mn/Fe/Pd(100) using magneto-optic Kerr effect and spin-sensitive electron spectroscopies
… We use SIMPA and the surface magneto-optic Kerr effect to study exchange coupling in Fe/Mn/Fe/Pd(100) multilayers. The intervening Mn layer is grown in a wedge shape ranging in thickness from 0 to 9 monolayers. Our results show that both Fe layers are coupled ferromagnetically for the entire …
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Vibrational Kerr spectroscopy
The infrared vibrational Kerr effect was investigated as a potentially selective and sensitive detection method for explosives. The investigation of the vibrational Kerr effect commenced with the first reported measurement of the integrated infrared vapor absorption strengths for the explosives …
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A Biaxial Magneto-optical Kerr Magnetometer for Studying Magnetic Thin Films
… designed and built a biaxial magneto-optical Kerr magnetometer to study thin magnetic films. The design enables researchers to measure perpendicular and in-plane hysteresis curves of ultra thin films down to a thickness of 9 A. The optical components are fastened to a vibration isolation table …
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Interfacial Dynamics and Applications in Optofluidics
… gallery modes (WGMs) can induce nonlinear effects in liquid droplets through mechanisms such as radiation pressure, light scattering, thermocapillarity, Kerr nonlinearity, and thermal effect. However, such nonlinear effects have yet to be thoroughly investigated and compared in the …
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INVESTIGATION OF THE NONLINEAR INDEX OF REFRACTION OF WATER AT 815 AND 407 NANOMETERS
… nonlinear index of refraction due to the optical Kerr effect in water at both 815 nm and 407 nm with pump pulse lengths of ~90 femtoseconds and ~250 femtoseconds respectively. The 815 nm measurement serves as a benchmark against previous published values while the 407 nm measurement is entirely …
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Investigation of High-Nonlinearity Glass Fibers for Potential Applications in Ultrafast Nonlinear Fiber Devices
… demultiplexing based on the optical Kerr effect has been proposed for the first time. The new scheme can turn the disadvantage of the extremely high group-velocity dispersion of high-nonlinearity glasses into an advantage of wavelength-division demultiplexing. Finally, it now would be …
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Einfluß der magnetischen Dipolkopplung auf den Tunnelmagnetowiderstand in Schichtsystemen und strukturierten Elementen
We have studied the effect of the dipolar magnetic coupling (also known as Néel coupling or "orange-peel" coupling) in tunneling magnetoresistive (TMR) elements. With an in situ scanning tunneling microscope we directly accessed the roughness of the films and found a close correspondence …
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Investigation of Anisotropic Heat Transport Through Frequency Domain Thermoreflectance Technique
… (BO-FDTR) and frequency domain magneto-optical Kerr effect (FD-MOKE) used to measure the anisotropic thermal properties with enhanced sensitivity. Monte Carlo computational method is also explained for uncertainty calculations. Finally, the demonstrations of measuring in-plane and out-of-plane …
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Coherent atom-light interactions in multi-level systems
… motivates the idea of an atomic quantum dot. The Kerr effect is then characterised and used to perform phase modulation in a gas. The Rydberg state itself is then phase modulated and this is shown to give rise to frequency sidebands which offer a promising way of determining dc electric fields.
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SPATIAL CHARACTERIZATION OF LASER FILAMENTS BY DETECTION OF SIGNATURES OF IONIZATION
… pulse self focuses as a result of the nonliner Kerr effect. Lim- ited data is available in terms of spatial characterization of the filament. We study the spatial distribution of molecular and atomic species generated by the filament in order to infer the relevant dynamics. We find evidence for …
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On the Role of Linear Processes in the Development and Evolution of Filaments in Air
… self-focusing resulting from the nonlinear Kerr effect is balanced by higher order nonlinearities such as plasma induced defocusing and absorption.This work examines the role that linear processes combined with initial spatial and temporal conditioningplay in the generation and subsequent …
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The c33 elastic constant of MoS2 as a function of pressure and the deposition of multilayer thin films by sputtering
… for use in time-resolved magneto-optical Kerr effect (TR-MOKE) experiments is also discussed, along with the preliminary film and transducer characterization. Four-point probe measurements of the thin films indicated high resistivities corresponding to roughness or small grain size. A …
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Probe of Coherent and Quantum States in Narrow-Gap Based Semiconductors in the Presence of Strong Spin-Orbit Coupling
… study phenomena such as interband photo-galvanic effects, in order to generate spin polarized current, 3) probe the effect of magnetic impurities on the spin/charge dynamics. This thesis describes three experiments: detection and measurement of spin polarized photocurrents in InSb films and …
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Dielectric and electro-optical properties of some cyanobiphenyl liquid-crystals
… have been observed. The phase transitions, effective molecular polarisabilities, anisotropy of polarisabilities and order parameters of three liquid crystal homologs (5CB, 6CB, and 7CB), 60CB and three eutectic nematic mixtures E7, E8, and E607 were calculated using optical and density data …
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