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- Grishina, A. D., et al.
(författare)
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Fast photorefractive polymer composites based on nanocrystalline J-aggregates of the
- 2004
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Ingår i: Synthetic Metals. - : Elsevier BV. - 0379-6779. ; 144:2, s. 113-120
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Tidskriftsartikel (refereegranskat)abstract
- The hole and electron drift mobility, photoelectric properties as well as influence of temperature, dark current and also relative position of oxidation potentials of the interacting components on photorefractive characteristics of the composites from aromatic polyimide doped with nanocrystalline J-aggregates of a cyanine dye are presented. The nanocrystalline J-aggregates were used as the photosensitizers and also as nonlinear optical chromophores. The experimental electric field dependence of the charge carrier photogeneration efficiency is well fitted by Onsager equation when the quantum yield of the bound thermalized electron-hole pairs φ0=1 and the initial separation of the charges in the pair r0=14.1Å. The charge photogeneration time constant determines the response time of the photorefractive grating formation. The polymer composites exhibit gain coefficient Γ=218cm-1 and response time shorter than 20ms at applied electric field 50V/μm and a intensity of each writing beam 30mW/cm2. The net gain coefficient Γ-α=143cm -1.
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| 5. |
- Grishina, A. D., et al.
(författare)
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Photoelectric, nonlinear optical, and photorefractive properties of polyvinylcarbazole composites with graphene
- 2013
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Ingår i: High Energy Chemistry. - 0018-1439 .- 1608-3148. ; 47:2, s. 46-52
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Tidskriftsartikel (refereegranskat)abstract
- Polyvinylcarbazole (PVK) composites containing graphene in an amount of somewhat less than 0.15 wt % exhibit third-order dielectric susceptibility due to the presence of graphene, as well as photoelectric and photorefractive sensitivity at 1064 nm. The photorefractive (PR) effect is known to occur in a polymer composite that possesses both photoelectric sensitivity and nonlinear optical properties. The photoelectric, nonlinear optical, and PR properties of PVK composites with graphene have been considered in this paper.
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| 10. |
- Vannikov, A, et al.
(författare)
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Effect of cyanine dyes on photoelectric, nonlinear optical and photorefractive properties of composites based on carbon nanotubes
- 2012
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Ingår i: Macroheterocycles. - : Ivanovo State University of Chemistry and Technology. - 1998-9539. ; 5:4-5, s. 377-383
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Tidskriftsartikel (refereegranskat)abstract
- Analysis of photoelectrical, nonlinear optical, and photorefractive properties of composites PVK containing singlewalled carbon nanotubes shows that addition of visible range cyanine dye with high electron affinity into the composites provides considerable increase of quantum efficiency of the mobile charge carries generation at 1064 nm, but reduces the third order susceptibility. As a result, photorefractive gain coefficient Γ of object laser beam increases twofold and achieves after pre-illumination the value 120 cm-1.
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