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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10 Nov 1997
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-vinyl carbazole), PVK, the charge generator C/sub 60/, the nonlinear optical chromophore 4-piperidino-benzylidene-malononitrile (PDCST), and the liquid plasticizer butyl benzyl 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-vinyl carbazole), PVK, the charge generator C/sub 60/, the nonlinear optical chromophore 4-piperidino-benzylidene-malononitrile (PDCST), and the liquid plasticizer butyl benzyl phthalate, BBP.
2 citations
23 Mar 1976
TL;DR: In this article, the authors evaluated various organic photorefractive materials for application in a reversible holographic memory system and identified indigoid dyes and 15, 16-dialkyldihydropyrene derivatives as materials potentially suitable for utilization in an operational system.
Abstract: Organic photorefractive materials were evaluated for application in a reversible holographic memory system. Representative indigo and thioindigo derivatives and several stilbene derivatives were studied as well as 15, 16-dialkyldihydropyrene derivatives the following goals were achieved: (1) the successful writing of phase holograms in a thioindigo/polymer gel system, (2) the successful writing and erasing of phase holograms in a variety of indigo/polymer gel and indigo/solid polymer systems, and (3) the identification of indigoid dyes and 15, 16-dialkyldihydropyrene derivatives as materials potentially suitable for utilization in an operational system. Photochemical studies of the stilbene, indigo, thioindigo, and dialkyldihydropyrene derivatives in solution and in a variety of polymer matrix materials were conducted with the goal of optimizing the photorefractive behavior of the chemical system as a whole. The spectroscopic properties required of optimal photorefractive materials were identified, and it was shown that both the indigoid dyes and the dialkyldihydropyrenes closely match the required properties.
2 citations
TL;DR: The photorefractive effect at the interface between a thin photoconducting layer and an oxidic electro-optic crystal was theoretically studied in this article, where a grating charge distribution in the photoconductor layer creates an electric field that penetrates the electro-Optic crystal, giving a refractive-index modulation near the interface.
Abstract: The photorefractive effect is theoretically studied at the interface between a thin photoconducting layer and an oxidic electro-optic crystal. A grating charge distribution in the photoconducting layer creates an electric field that penetrates the electro-optic crystal, giving a refractive-index modulation near the interface. The photorefractive gratings of different crystal geometries are discussed.
2 citations
23 Oct 1998
TL;DR: In this paper, the authors investigated grating interactions in azo-dye doped photorefractive polymers with a view to assessing their suitability for use in such information processing applications.
Abstract: Multiple grating phenomena have been observed in a number of photorefractive systems, and interaction between such gratings has been proposed as the basis for the demonstration of interesting optical effects such as velocity filtering and image deafferentation. We are investigation grating interactions in azo-dye doped photorefractive polymers with a view to assessing their suitability for use in such information processing applications. We report the result of wave-mixing investigations on two photorefractive polymer systems. The first system is a conventional guest-host photorefractive polymer based on the photoconducting host PVK:ECZ:TNF and the nonlinear chromophore trans-4-N,N-diethylamino-(E)- cinnamonitrile (DEACST). The results of degenerate four wave mixing and two beam coupling experiments in this composite are described well by the orientational enhancement model. The second system is a hybrid composite consisting of PVK:DEACST:ECZ:TNF and the well known azo-dye disperse red 1. In this system, gratings may be written via the photochemical mechanism of photoisomerization as well as the photorefractive effect. We suggest that the diffraction behavior of the hybrid composite involves a disruption of the light-induced azo-dye molecular orientation by the space charge field.© (1998) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
2 citations
TL;DR: Using circular polarization of the input HeNe laser beam, it is succeeded to create a stable self-focused, asymmetric light-beam over several hours, where a transient symmetric state is observed.
Abstract: We present experimental results on the self-focusing of light beams in a photorefractive, optically active Bi12TiO20 crystal. Using circular polarization of the input HeNe laser beam we succeeded to create a stable self-focused, asymmetric light-beam over several hours. Depending on external parameters, like the external electric field and the intensity ratio, a transient symmetric state is observed.
2 citations