<i>The Physics and Applications of Photorefractive Materials</i>

Solymar, L.; Webb, David J.; Grunnet‐Jepsen, A.; Ducharme, Stephen

doi:10.1063/1.882011

Cited by 265 publications

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“…The accuracy of the solutions regarding to the electric field distribution contains in the range to 10%. Moreover, the proposed approach is flexible and can be employed to more complicated PDDT models [22] than the standard one analyzed in this work, and for every set of material equations.…”

Section: Discussionmentioning

confidence: 99%

New approach to solution of photorefractive transport equations

2008

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Abstract:In our work we propose a novel method of analysis of photorefractive transport equations. The method based on a perturbative approach can be used in the case of two wave mixing and four wave mixing geometry, i.e. for the samples illuminated by interference patterns. Presented approach can be employed for a broad range of material and experimental parameters, particularly for arbitrary depth of light modulation pattern. The approximate analytical solution is compared with results of numerical calculations and a good agreement practically in every case was found. PACS

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Section: Discussionmentioning

confidence: 99%

New approach to solution of photorefractive transport equations

2008

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“…12 Photorefractive holograms have potential application in integrated optics, optical data storage, optical computing, and several other areas. 13 Nonuniform illumination, for example the interference fringes of intersecting coherent optical beams, generates free carriers in the bright regions and these carriers drift and diffuse into the darker regions where they are retrapped.…”

Section: Introductionmentioning

confidence: 99%

Effect of dipolar molecules on carrier mobilities in photorefractive polymers

Goonesekera

Ducharme

1999

Journal of Applied Physics

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The grating formation speed in photorefractive polymers is greatly reduced by highly polar molecules incorporated by necessity in large concentrations to produce large diffraction efficiency and two-beam energy coupling gain. The random electric fields generated by these dipoles interfere with charge transport by increasing the width of the hopping site energy distribution and thus greatly reducing the carrier mobility and the photorefractive speed. We conducted transport studies of several model systems consisting of combinations of two polymer binders, six charge transport agents ͑four for holes and two for electrons͒, and varying concentrations of two highly polar electro-optic chromophores. The results confirm that carrier mobility is greatly reduced in the presence of polar molecules in accordance with the predictions of models of hopping transport in the presence of dipolar disorder. The randomly positioned and oriented dipoles increase the width of the hopping site energy distribution by an amount proportional to the square root of the dipole concentration and to the strength of the dipole moment. The results also show that transport agents with smaller dipole moments reduce the sensitivity to the dipolar effect. The photorefractive speed may therefore be increased by using transport agents with small dipole moments.

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“…Toutefois, certains matériaux ont des particularités (activité optique dans les sillénites, effet photovoltaïque dans le niobate de lithium, ...) qui peuvent venir modifier leurs performances. Ces effets qui viennent compliquer la physique de l'effet photoréfractif n'ont pas été abordé dans cet article, mais on pourra trouver des compléments utiles dans les références [PAU00] et [SOL96].…”

Section: Resultsunclassified

“…Une présentation plus détaillée des propriétés de l'effet photoréfractif peut être trouvée dans les références [PAU00] et [SOL96].…”

Section: /20unclassified

Matériaux photoréfractifs

Delaye¹,

Roosen²

2003

Élaboration Et Caractérisation Des Cristaux Massifs Et en Couches Minces Pour l'Optique

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Résumé. Les matériaux photoréfractifs sont les matériaux parmi les plus utilisés dans les dispositifs basés sur l'holographie dynamique. De nombreuses applications utilisant ces matériaux sont développées et certaines ont maintenant débouché sur des dispositifs disponibles commercialement. Par ailleurs la recherche sur l'optimisation et l'augmentation des performances des matériaux photoréfractifs reste très active. Le but de cet article est de présenter les phénomènes et les équations à la base de l'effet photoréfractif. Les paramètres régissant l'effet photoréfractif et leurs liens avec les caractéristiques physiques du matériau sont décrits. Dans un second temps, les montages de bases qui permettent d'utiliser l'effet photoréfractif (diffraction et mélange à deux ondes) sont présentés en insistant sur leur utilisation pour la caractérisation des matériaux.Mots-clés. Effet photoréfractif, mélange d'ondes, holographie, transport de charges, optique non linéaire.Élaboration et caractérisation des cristaux massifs et en couches minces pour l'optique

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The Physics and Applications of Photorefractive Materials

Cited by 265 publications

References 0 publications

New approach to solution of photorefractive transport equations

New approach to solution of photorefractive transport equations

Effect of dipolar molecules on carrier mobilities in photorefractive polymers

Matériaux photoréfractifs

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