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: In this article, the photorefractive properties of the Sn2P2S6 crystals are improved by growth conditions (change of the transport agent) and such modified samples exhibit significantly increased two-beam gain coefficient.
Abstract: The Sn2P2S6 crystals are photorefractive materials suitable for red and near infra-red spectral range. Photorefractive properties of the Sn2P2S6 crystals are improved by growth conditions (change of the transport agent). Such modified samples exhibit significantly increased two-beam gain coefficient. Some of the microscopic parameters responsible for the photorefraction (Debye screening length, diffusion length, effective electrooptic coefficients etc.) were evaluated. The accompanied photorefractive scattering effects are also studied.
4 citations
TL;DR: In this paper, active block copolymers were synthesized via an atom transfer radical polymerization of acrylate containing liquid crystalline moiety and hole transporting carbazole moiety.
Abstract: Photorefractive active block copolymers were successfully synthesized via an atom transfer radical polymerization of acrylate containing liquid crystalline moiety and hole transporting carbazole moiety. Resulting copolymers were characterized by gel permeation chromatography, NMR, and DSC. Copolymers afforded the transparent films showing birefringent nature. Photorefractive characteristics of copolymers with 2 wt% of trinitro- fluorenone as a photosensitizer were investigated by four wave mixing and two-beam coupling methods with a He-Ne laser. For the block copolymer, higher diffraction efficiency and larger coupling gain were observed compared with the corresponding statistical random copolymer.
4 citations
TL;DR: The phase stability and photorefractive properties of a new poly(N-vinylcarbazole) (PVK)-based photore-fractive polymer composite by modifying the structure of a nonlinear optical chromophore (NLO), 4-butoxy-3-propyl-1-(4'-nitrophenyazo)benzene was studied in this article.
Abstract: We studied the phase stability and photorefractive properties of a new poly(N-vinylcarbazole) (PVK)-based photorefractive polymer composite by modifying the structure of a nonlinear optical chromophore (NLO), 4-butoxy-3-propyl-1-(4'-nitrophenyazo)benzene. The shelf life of a sample with a modified NLO, 4-(2-ethylhexyloxy)3-propyl-1-(4'-nitrophenyazo) benzene was extended by more than five months even though it had a low glass transition temperature (Tg) of -19°C. This material also had a short photorefractive response time constant of 33 ms and a high diffraction efficiency of 49% at an electric field of 100 V/µm and a total writing intensity of 942 mW/cm2. These desirable characteristics are believed to be due to the following reasons: first, the new chromophore acts as a plasticizer, thereby enhancing the orientation of the NLO and second, the solubility of the chromophore in a polymer matrix increases, inhibiting crystallization and providing a high optical quality.
4 citations
TL;DR: In this article, the effect of chromophore (DB-IP-DC) on the photorefractive performance in organic photore-fractive composites was investigated and the photocurrent was measured by the competition between the hole trapping and detrapping rates.
Abstract: We investigated the effect of chromophore (DB-IP-DC) on the photorefractive performance in organic photorefractive composites. We prepared several photorefractive composites; PSX-Cz:TNF:DB-IP-DC:BBP = 69:1:x:(30 − x) wt% and measured photocurrent and PR grating build-up time. The photocurrent was measured by the competition between the hole trapping and detrapping rates from DB-IP-DC and PSX-Cz. The PR grating build-up rate increased with the increment of photocurrent.
4 citations
TL;DR: In this article, a rigorous numerical investigation of stationary and transient behavior of photorefractive grating induced in the semiconductor quantum wells structure is presented in the framework of the band transport model for the case of high modulation depth.
4 citations