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Showing 1 to 20 of 33 for “"Optical Kerr effect"”.
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INVESTIGATION OF THE NONLINEAR INDEX OF REFRACTION OF WATER AT 815 AND 407 NANOMETERS
… the 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 …
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Investigation of High-Nonlinearity Glass Fibers for Potential Applications in Ultrafast Nonlinear Fiber Devices
… response time and potential applications in optical communication systems. They usually require long fibers to generate sufficient nonlinear phase shifts, since nonlinearities of conventional silica-core silica-clad fibers are too low. These long devices, however, cause the serious problems …
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A Biaxial Magneto-optical Kerr Magnetometer for Studying Magnetic Thin Films
I have 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 …
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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 …
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The c33 elastic constant of MoS2 as a function of pressure and the deposition of multilayer thin films by sputtering
… transducers 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 …
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Probe of Coherent and Quantum States in Narrow-Gap Based Semiconductors in the Presence of Strong Spin-Orbit Coupling
… of this project was to study some unexplored optical and magneto-optical properties of the newest member of III-V ferromagnetic structures, InMnSb, as well as InSb films and InSb/AlInSb quantum wells. The emphasis was on dynamical aspects such as charge and spin dynamics in order to address …
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Spectroscopic investigations of hydrogen bond dynamics in liquid water
… Using a novel Raman technique, spatially masked optical Kerr effect spectroscopy, I first measured interaction-induced fluctuations in the isotropic many-body polarizability of water and several other liquids. In contrast to the behavior of simple liquids, the isotropic response of water is …
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Linear and H-shaped chiral dimers for applications in photonic liquid crystals
The Optical Kerr effect in blue phases has recently been shown to be of practical use in fast switching display devices. This mode provides a linear response with respect to an applied electric field and thus grey-scale is possible. Fast responses are of prime interest in advanced display …
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Ultrathin films on semiconductor substrates : growth, magneto-optical characteristics and spin injection
… especially their magneto-optical properties and spin injection.Magnetic ultrathin films were grown on different GaAs substrates using an e-beamevaporation technique. The MBE system which is used to fabricate and analyseultrathin films is home designed and assembled. The …
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TIME-DOMAIN INVESTIGATION OF ACOUSTICALLY AND THERMALLY DRIVEN MAGNONS
… resonance in Fe5GeTe2 employing tr-Magneto-Optical Kerr Effect (MOKE), implemented in the same setup, as a function of both the external magnetic field and the temperature. The presented results provide insights into the dynamic magnetic properties of the systems studied and highlight …
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Dzyaloshinskii-Moriya Interaction and Local Exchange Variation in Rare-Earth Transition-Metal Ferrimagnets
… develop a simple method for determining magneto-optical Kerr angles that informs efficient design of magneto-optical Kerr effect microscopes. Additionally, we observe a significant variation in both RE and TM average atomic moment as a function of composition well described by a local environment …
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Magnetisierungsumkehr und -dynamik in Exchange-Bias-Systemen
The present thesis describes magneto-optical analyses of exchange bias thin film systems. Exchange bias (EB) is a unidirectional anisotropy originating from coupling of a ferromagnetic with an antiferromagnetic layer. The magneto-optical Kerr effect (MOKE) allows for detection of the longitudinal …
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The use of terahertz spectroscopy for biomolecular analysis
… The bulk of this work employed terahertz Optical Kerr Effect (OKE) Spectroscopy as a novel means to study biomolecules in solution - This Raman based technique has the advantage that it does not suffer the same water absorption as conventional terahertz spectroscopies. We analysed a …
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Systematic Study of Parameters Affecting Unconventional Magnetism in Gold Nanostructures
… to the thiol used to coat it, and that the effect of an electron-withdrawing terminal group of the thiol is much greater than its chain length. The second series establishes that thiolate-coated gold thin-films are indeed magnetic, a notion previously debated. It shows the thin-films to be …
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Ultrafast nonlinear optical properties of passive and active semiconductor devices
Nonlinear optical properties and ultrafast carrier dynamics of slab-coupled optical waveguide amplifiers, silicon nanowaveguides, and III-V semiconductor saturable Bragg reflectors are studied. The limits imposed by two photon absorption and free-carrier absorption on the gain and output powers of …
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LARGE AREA 3D PHOTONIC CRYSTALS WITH EMBEDDED WAVEGUIDES
… For electrons and holes, the periodic potential effectively determines how the charged particles propagate through the crystal under applied fields. Similarly, for photons in a photonic crystal, the periodic dielectric function can give rise to photon bandgaps that control the motion of …
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Numerical Analysis of Optically-induced Long-period Fiber Gratings for Sensing Applications
… induce a refractive index grating due to the optical Kerr effect, and the grating is called optically induced long-period fiber grating (OLPG). Compared to the grating induced by acoustic waves, OLPG is able to travel for a long distance due to the small attenuation of the guided core modes. …
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Modifying the magnetic properties of Laves phase intermetallic multilayers and films by nano-patterning and ion implantation
… coercivity. Ar+ ion implantation is shown to be effective at artificial structuring on the atomic-scale. In addition, energetic Ar+ ions have been successfully used to accurately control the easy and hard axes of magnetization within epitaxial YFe2 and DyFe2 films and a DyFe2 / YFe2 exchange …
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