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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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Proceedings ArticleDOI
03 May 1998
TL;DR: In this paper, the development and characterization of new high-gain photorefractive polymers, with emphasis on a particular stable composite composed of the photoconductor poly(N-vinylcarbazole) (PVK), the charge generator C/sub 60/, the nonlinear optical chromophore 4-piperidinobenzylidene malononitrile (PDCST), and the liquid plasticizer butylbenzyl phthalate (BBP).
Abstract: This talk focuses on the development and characterization of new high-gain photorefractive polymers, with emphasis on a particular stable composite composed of the photoconductor poly(N-vinylcarbazole) (PVK), the charge generator C/sub 60/, the nonlinear optical chromophore 4-piperidinobenzylidene malononitrile (PDCST), and the liquid plasticizer butylbenzyl phthalate (BBP). The optical properties of this material, denoted PVK:PDCST:BBP:C/sub 60/, have been reported recently, and the material has been shown to exhibit a high two-beam coupling gain coefficient, fast response time, over-modulation of diffraction efficiency, high sensitivity, and high stability. Using such high-gain coefficients, we believe we have recently observed amplified scattering (beam fanning) in a photorefractive polymer for the first time.

5 citations

Proceedings ArticleDOI
15 Aug 2005
TL;DR: In this paper, interference imaging of refractive index distribution in photorefractive records in the LiNbO3 sample is presented, which shows that an easily readable image can be obtained when refractive indices are modulated only in direction parallel with interference fringes.
Abstract: Short analyze and some results of interference imaging of refractive index distribution in photorefractive records in the LiNbO3 sample are presented. The presented result shows that an easily readable image can be obtained when refractive index is modulated only in direction parallel with interference fringes. For this purpose, it is useful to use Mach-Zehnder interferometer what allows adjusting the interference fringes to desired position. Obtained images of records of a light field with aperiodic distribution of intensity show that refractive index profiles do not correspond to profile of light intensity or intensity of internal electric field (which is formed by the sample illumination). It is more like the profile of distribution of carrier concentration trapped on the donors or profile of square of the electric field when gradient of refractive index is parallel or perpendicular to c axis of the crystal, respectively. This result leads to necessity of modifying explanation of mechanism of photorefractive record creation. At least in investigated LiNbO3:Fe.© (2005) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.

5 citations

Journal ArticleDOI
TL;DR: In this paper, the photorefractive effect of C70-doped bistable surface stabilized ferroelectric liquid crystals is investigated and an innovative approach toward the optical control of polarization switching in C70doped Bistable devices by means of a photogenerated space charge field is described.
Abstract: In this paper, results of studies regarding the photorefractive effect in bistable surface stabilized ferroelectric liquid crystals are reported. In particular, an innovative approach toward the optical control of polarization switching in C70-doped bistable devices by means of a photogenerated space-charge field is described. The photorefractive nature of the resulting refractive index gratings is confirmed by two-beam coupling and direct phase shift measurements. The influence of an applied field and of light intensity on grating formation is also studied. The photorefractive gratings obtained by using this approach are stable, easily erasable, and rewritable. The described devices are “binary” systems, in which the refractive index switches only between two possible values. Bistable systems constitute a completely new class of photorefractive materials, with peculiar properties which distinguish them from previously developed media.

5 citations

Journal ArticleDOI
TL;DR: In this paper, photoinduced variations in the refractive index of nitrogen-doped silica are directly measured in the wavelength range from 350 to 2500 nm, and it is found that the change in the photorefractive index under the action of 193 nm laser radiation significantly increases in the long-wavelength region and amounts to ~10-3 at λ=2.5 μm (for the energy fluence ~104 J cm-2).
Abstract: Photoinduced variations in the refractive index of nitrogen-doped silica are directly measured in the wavelength range from 350 to 2500 nm. It is found that the change in the refractive index under the action of 193 nm laser radiation significantly increases in the long-wavelength region and amounts to ~10-3 at λ=2.5 μm (for the energy fluence ~104 J cm-2). This means that the nature of the photorefractive effect in nitrogen-doped silica is related to photostructural transformations affecting the phonon part of the optical absorption spectrum.

5 citations

Journal ArticleDOI
TL;DR: In this article, an improved mathematical model for photorefractive materials exhibiting hole-electron competition where the constants accounting for electrical coupling between holes and electrons are independently adjusted for each one of them is presented.
Abstract: We describe an improved mathematical model for photorefractive materials exhibiting hole-electron competition where the constants accounting for electrical coupling between holes and electrons are independently adjusted for each one of them. Experimental results from photorefractive titanosillenite crystals with hole-electron competition, and particularly from a vanadium doped sample, are shown to be better described by this modified model than by the classical one already reported in the literature.

5 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20231
20211
20201
20181
20172
20165