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 paper, a relatively simple method for the determination of the drift length, which takes into account that the charge carrier mobility depends on the sample thickness, is introduced. But it is not suitable for time-of-flight and holographic simulations.
Abstract: The drift length of charge carriers has a significant influence on the dynamics of the space-charge field in organic photorefractive materials. This letter introduces a relatively simple method for the determination of the drift length, which takes into account that the charge carrier mobility depends on the sample thickness. By combining results of time-of-flight and holographic time-of-flight experiments using the stochastic transport model of Scher and Montroll, the effective drift length can be determined as 2.4 μm in the investigated photorefractive glass.
10 citations
TL;DR: In this paper, the authors show that photorefractive materials having large electro-optic coefficients such as BaTiO 3 require relatively small electric field to induce sufficient phase mismatch for the reduction of the diffraction efficiency to a large extent.
10 citations
TL;DR: In this article, a polyvinyl carbazole based photorefractive composite was used to tune the near-infrared holographic recording speed by illuminating it at a wavelength of very strong absorption.
Abstract: The authors report on tuning the near-infrared holographic recording speed in a poly(N-vinylcarbazole) based photorefractive composite by illuminating it at a wavelength of very strong absorption. Due to the small penetration depth of the light under these conditions this approach allows to flood the material with charge carriers from the side of the sample. Even at light levels much stronger than the write beams, this additional illumination does allow for grating recording. However, under these conditions competition between positive and negative charges leads to sign inversion of the two-beam coupling gain coefficient during recording. An improvement of the recording speed is demonstrated.
10 citations
TL;DR: In this article, a novel optical medium formed by a liquid crystal layer coupled to a thin photorefractive crystal, allowing a dynamical control of the liquid crystal birefringence was presented.
Abstract: We present a novel optical medium formed by a liquid crystal layer coupled to a thin photorefractive crystal, allowing a dynamical control of the liquid crystal birefringence. We show two-wave mixing amplification, optical pattern formation and self-pumped phase conjugation.
10 citations
TL;DR: By using soluble fullerene derivative, this work improved photorefractive efficiency in polymer-liquid crystal composites in comparison to previous works on similar materials and proposed an approach for designing composites with higher grating efficiency and resolution.
Abstract: By using soluble fullerene derivative [60]PCBM, we improved photorefractive efficiency in polymer-liquid crystal composites in comparison to previous works on similar materials. We show the effect of polymer network results in resolution and bandwidth improvements compared to pure liquid crystals. This is explained by the introduction of a charge trapping mechanism, providing a memory effect for the composite. Based on this effect, we propose an approach for designing composites with higher grating efficiency and resolution.
10 citations