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Showing 1 to 20 of 29 for “"Magneto-Optic"”.
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Evaluation of on-chip integration of magneto-optic isolators
The recent development of on chip integration of magneto-optic isolators is reviewed. Two major categories of structural designs for waveguide isolator (nonreciprocal mode conversion and nonreciprocal phase shift) have both merits and short comings for integration. The advances in integration …
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The magneto-optic spectra of bismuth-substituted iron garnets
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 1994.
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The longitudinal Kerr magneto-optic effect in ferromagnetic thin films
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering, 1960.
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The transverse Kerr magneto-optic effect in thin magnetic films
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering, 1962.
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High performance magneto-optic garnet materials for integrated optics and photonics
… properties (crystallinity, film morphology, optical absorption spectra across the visible spectral range and the elemental composition of layers), and magneto-optic behaviour (Faraday rotation, hysteresis loops of Faraday rotation, and magnetic switching behaviour) of these sputtered garnet …
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Magneto-Optic Spectroscopy and Near-Field Optical Coupling in Nanoparticle Composite Materials
… on the dipole approximation which accounts for optical coupling between magnetite particles. Qualitative correlations between theoretical calculations and experimental data suggest the shifts in spectral peak position depend on both interparticle distance and geometrical configuration.
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DEVELOPMENT OF MAGNETO-OPTIC SENSORS WITH GALLIUM IN BISMUTH DOPED RARE-EARTH IRON-GARNET THICK FILMS
… field of 50 pT at 1 kHz. Unlike previous Magneto-Optic (MO) studies that typically used thin films of approximately 1um thickness, we used approximately 400um thick films to allow experimentation with the final, robust, ideal form the MO sensor would take. We measured what most other MO …
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Modulation Technique for Magneto -Optic Imaging of Weak Magnetic Fields With Rare-Earth Iron Garnet Films
Magneto-optic imaging technology has been applied to nondestructive evaluation of aging aircraft as well as imaging of eddy currents in superconductors, but so far has been limited to imaging fields in the millitesla range. The bismuth-doped rare-earth iron garnet films studied here exhibit …
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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
… depth profiling. 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 …
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Brillouin scattering induced transparency: Coherent optomechanical interaction leading to slow light and non-reciprocal light transmission
An optical isolator is a device that allows only one-way light transmission. It is an essential optical component used for protection of laser sources found in many applications such as undersea optical communication networks, spectroscopy, fluorescence microscopy, and laser cutting. Today, all …
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Non-reciprocal light transmission in integrated photonic systems via acousto-optic interaction
… communications and sensors. Presently, all key optical components including lasers, waveguides, and modulators can be mass fabricated on a PIC using foundry-based manufacturing. However, essential non-reciprocal devices such as optical isolators and circulators are not yet available. …
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Sol-gel processing of RxY3-xAlyFe5-yO12 magneto-optical films
… research was the fabrication of thin films with magneto-optic (MO) properties. Accomplishment of this task was achieved via sol-gel processing of rare-earth and aluminum substituted yttrium-iron garnet (RxY3-xAlyFe5-yO12, R,Al:YIG), where R= Bi, Gd, Er, Ho. Detailed are the processing conditions, …
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Experimental investigations of the pretransition behavior near the nematic-smectic A phase transition
… of the liquid crystal. The second is a novel magneto-optic experiment which uses an external magnetic field to distort the liquid crystal and a sensitive optical interference technique to measure the distortion. Both measurements are performed with millikelvin temperature resolution and yield …
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Study of Variable MUX/DEMUX for DWDM Applications in Optical Communications using Thin Film Magnetooptic Materials
This study has investigated thin film magnetooptic variable MUX/DEMUX for DWDM optical communications. Several items were studied to include: total diffraction angles achieved with magneto-optic ferrite thin films in a two dimensional multi stage array configuration; three dimensional analysis of …
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Magnetic and thermal properties of metallic antiferromagnetic materials
… of the lack of net magnetization. The linear magneto-optic Kerr effect (MOKE) is often used to probe magnetism of ferromagnetic materials, but MOKE cannot be applied to collinear antiferromagnets due to the cancellation of sublattice magnetization. Magneto-optic constants that are quadratic in …
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Micromagnetic modelling and magneto-optical characterization of Ni/V2O3 hybrid structures
… sapphire, Al2O3, were investigated using MOKE (magneto-optic Kerr effect). Three samples show a fourfold symmetry in coercivity with very small but similar change in magnetic remanence. For comparison micromagnetic simulations were done in Mumax3. The samples have a well defined growth …
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Two classes of unconventional photonic crystals
… dielectric photonic crystals studied in optical physics. The first class of unconventional photonic crystal consists of atoms bound in an optical lattice. This is a "resonant photonic crystal", in which an underlying optical resonance modifies the usual band physics. I present a …
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Suppression of disorder-induced scattering in optomechanical systems
High-Q optical and mechanical resonators have been utilized in ultra-high precision metrology, transducers, sensor applications, and even investigating quantum mechanics at mesoscales. However, these low-loss devices are often limited by sub-wavelength fluctuations within the host material, that …
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Iron Garnet Thin Films for Integrated Photonics and Spintronics
… for both applications as they have: 1) strong magneto-optic (MO) response and low optical absorption at communication wavelengths making them enablers for nonreciprocal devices essential in photonic integrated circuits. 2) Low Gilbert damping and perpendicular anisotropy (PMA) that promote fast …
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