http://ieeexplore.ieee.org/iel1/2219/10593/00492678.pdf

The physical principles of magneto-optical recording

The present invention is about an optical isolator for use with a wavelength band of 600-800 nm having a Faraday rotator made of an oxide material containing an oxide represented by formula (I) in an amount of 99% or higher and having a Verdet constant of 0.90 min/Oe*cm or greater in the case of a wavelength band of 633 nm, and a hollow magnet arranged to surround the Faraday rotator, and the invention is also characteristic in that the sample length L (cm) along which the Faraday rotator is arranged is in the range represented by inequality (1) and that the magnetic flux density B (Oe) impressed on the Faraday rotator is in the range represented by inequality (2) (TbxR1-x)2O3 (I), wherein 0.5 (2).

An optical isolator

Bubble domain memory materials

Ce travail porte sur l’exaltation de l’effet magneto-optique (MO) Kerr transverse induite par des «resonances extraordinaires» dans un reseau d’or periodique 1D depose sur un oxyde de grenat magneto-optique. La structure complete incluant le reseau metallique 1D a ete concue, simulee numeriquement, dimensionnee, fabriquee puis caracterisee. Un algorithme de type RCWA (Rigorous Coupled Wave Algorithm) adapte au calcul parallele a ete developpe et utilise d’une part pour l’etude theorique des modes resonants dans les reseaux magnetoplasmoniques et d’autre part pour l’analyse des donnees de mesures optiques et magneto-optiques d’ellipsometrie a base de matrices de Mueller. L’impact sur la reflectivite angulo-spectrale du couplage entre les modes Fabry-Perot des fentes du reseau et les plasmons de surface a l’interface entre l’or et la couche de grenat MO est ainsi etudie, en utilisant les parametres optiques et magneto-optiques reels des materiaux. Pour cela, les caracteristiques optiques du substrat en sGGG (grenat de gallium et gadolinium dope CaMgZr) et du materiau Bi:GIG (grenat de fer et de gadolinium substitue bismuth) sont au prealable determines dans la gamme spectrale 0,73 – 6,42 eV (193 nm-1,7 μm) par ellipsometrie a base de matrices de Mueller. Puis de meme la dispersion des composantes magneto-optiques du tenseur dielectrique est obtenue en appliquant un champ magnetique externe dans le plan, en configuration longitudinale ou transverse. Ces donnees mesurees sont alors utilisees dans les simulations. Il est ainsi demontre numeriquement que grâce a l’interaction des resonances de surface et de cavite dans le reseau 1D l’effet Kerr transverse peut etre exalte, eteint ou meme de signe inverse, et cela sans renverser ou modifier l’aimantation de la couche magneto-optique. Pour confirmer les resultats theoriques, une serie d’echantillons comportant des reseaux de fentes differentes a ete fabriquee par lithographie electronique et procede de lift-off. Afin de reproduire les donnees des matrices de Mueller mesurees, les modeles ont ete adaptes et optimises pour tenir compte des imperfections des structures reelles. Les mesures experimentales confirment l’exaltation de l’effet Kerr magneto-optique transverse due aux effets magneto-plasmoniques et prouvent la validite des modeles.

Theoretical and experimental study of novel integrated magnetoplasmonic nanostructures

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Theoretical and experimental study of novel integrated magnetoplasmonic nanostructures