Topic
Organic photorefractive materials
About: Organic photorefractive materials is a research topic. Over the lifetime, 697 publications have been published within this topic receiving 13041 citations.
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TL;DR: A large photorefractive effect caused by the excitonic electro-optic effect is observed in semi-insulating InGaAs/GaAs multiple quantum wells fabricated by metal-organic vapor-phase epitaxy and proton implantation.
Abstract: Semi-insulating InGaAs/GaAs multiple quantum wells are fabricated by metal-organic vapor-phase epitaxy and proton implantation. Two-wave mixing gain and four-wave mixing diffraction efficiency are measured at wavelengths of 0.91–0.94 ?m in the Franz–Keldysh geometry. We observe a large photorefractive effect caused by the excitonic electro-optic effect. The maximum diffraction efficiency reaches ?1.5×10-4.
12 citations
TL;DR: The Faraday photoreFractive effect is demonstrated by combining photorefractive two-beam coupling with Faraday rotation in Cd1–xMnxTe, a diluted magnetic semiconductor.
Abstract: The Faraday photorefractive effect is demonstrated by combining photorefractive two-beam coupling with Faraday rotation in Cd1–xMnxTe, a diluted magnetic semiconductor. Two-wave mixing is monitored as a function of incident-beam polarization and magnetic-field strength with the grating vector parallel to a 〈111〉 axis. The photorefractive gain is an oscillatory function of the magnetic field. The magnetic field controls the direction and magnitude of photorefractive energy transfer by rotating the polarization inside the crystal.
12 citations
TL;DR: A quantitative comparison of the photorefractive effect in annealed proton-exchanged channel waveguides in MgO-doped and congruent LiNbO(3) at the wavelengths of 633 and 830 nm is presented.
Abstract: A quantitative comparison of the photorefractive effect in annealed proton-exchanged channel waveguides in MgO-doped and congruent LiNbO(3) at the wavelengths of 633 and 830 nm is presented. An accurate measurement technique is described to measure the refractive-index change as a function of time and the guided mode intensity for different wavelengths. The results show that doping with 7% MgO reduces the photorefractive effect at a wavelength of lambda = 633 nm by 2 orders of magnitude. The photorefractive effect in the doped substrate shows only a weak dependence on the guided power. Doping with 4 mol.% MgO has only little effect on the photorefractive effect compared with that on the congruent material. A reduced photovoltaic current is responsible for the small photorefractive effect in the 7 mol. %-doped substrate.
12 citations
TL;DR: In this article, a photorefractive polymer composite containing a trapping layer was reported to have a grating life time as high as 600 s and a diffraction efficiency and gain coefficient also increased by the introduction of a trapping mechanism.
Abstract: A photorefractive polymer composite containing a trapping layer which exhibits a significant enhancement in its photorefractivity is reported. The photorefractive polymer composite containing a trapping layer showed a grating life time as high as 600 s, while the grating life time was only 7 s in the photorefractive polymer composite without a trapping layer. The grating growth rate was found to be unaffected by the introduction of a trapping layer. The diffraction efficiency and gain coefficient also increased by the introduction of a trapping layer. The enhancement in the photorefractive properties is due to the increase in the space-charge field developed in the photorefractive polymer composite containing a trapping layer.
12 citations
TL;DR: The energy and grating pitch dependence of the diffraction and a model that can qualitatively explain them are presented and the capability to couple energy between two 1.03 eV surface plasmon polariton modes is demonstrated.
Abstract: We present a photorefractive hybrid liquid crystal system that allows strong photorefractive effects on surface plasmon polaritons. We demonstrate its capability to couple energy between two 1.03 eV surface plasmon polariton modes with an efficiency of 25.3±2.3%. We present the energy and grating pitch dependence of the diffraction and a model that can qualitatively explain them.
12 citations