共查询到20条相似文献,搜索用时 93 毫秒
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一种新型红敏光致聚合物全息特性研究 总被引:1,自引:0,他引:1
对一种新合成的红敏光致聚合物进行了一系列研究 ,实验表明用该材料制作的全息干板获得了近 70 %的实时衍射效率 ,从理论上解释了曝光量与衍射效率的关系曲线 ,并研究了该材料的其它特性。这些结果表明 ,该红敏光致聚合物材料具有较好的实时全息记录特性。 相似文献
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掺杂PbSe/PVA量子点的光致聚合物全息特性 总被引:1,自引:0,他引:1
通过原位合成法以聚乙烯醇辅助合成了6.5nm、10nm和15nm的PbSe量子点,研究了掺杂PbSe量子点的光致聚合物的全息特性.将三种尺寸的PbSe量子点按不同浓度分别掺入光致聚合物中,制成无机-有机复合型光致聚合物膜,并对其全息性能进行研究.复合聚合物膜的UV-Vis吸收光谱表明掺入的PbSe量子点并未与聚合物中的有机组分发生化学反应.采用氩氪离子激光器输出的647nm红光研究了复合聚合物膜的透过率和全息记录光栅的布喇格偏移与衍射效率.透过率曲线表明PbSe量子点在复合聚合物膜中分散良好,膜表面均匀.由于PbSe量子点在聚合物链中起支撑作用,复合聚合物膜在全息记录过程中不易发生形变,从而增加了聚合物膜的抗缩皱能力.衍射效率曲线表明掺入PbSe量子点的复合聚合物膜的衍射效率比未掺杂的有所提高.此外,体系存在一个最优值,当掺入平均粒径为10nm且浓度为3.6×10-6 mol/L的PbSe量子点时,样品的透过率达到84%,衍射效率从67.2%提升到89.7%,缩皱率降低到0.8%,极大提高了材料的全息性能. 相似文献
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制备了一种以番红花红T为光敏剂的新型全息存储材料,主要用Ar+激光器的514.5nm波长的绿光研究材料的全息特性.研究表明,该材料具有较高的衍射效率、曝光灵敏度和较大的折射率调制度,衍射效率近40%,灵敏度为7.22×10-4cm2/mJ,折射率调制度为3.65×10-4,同时,在读出时必须考虑布拉格偏移对全息存储的影响.在介质膜中存储了全息图像,再现图像较为清晰,说明该材料适合用作高密度全息存储介质.
关键词:
全息存储
光致聚合物
衍射效率
布拉格偏移 相似文献
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制备了一种三乙醇胺与N-苯基苷氨酸为共同引发剂的丙烯酰胺基光致聚合物全息存储材料,并用He-Ne 激光器633 nm波长的光对样品进行曝光测试.实验表明,与单引发剂的光致聚合物相比,薄膜的质量有一定的提高,在曝光灵敏度变化不大的情况下,衍射效率有很大提高.优化两种引发剂浓度后,此种共同引发的光致聚合物材料呈现的衍射效率达到54%,曝光灵敏度为1.85×10-2cm2/mJ.还研究了此种光致聚合物的透过率随曝光时间和曝光强度的变化,说明此种光致聚合物材料内部均匀性好,对光的散射小. 相似文献
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The surface morphology evolution of three thin polystyrene (PS)/polymethyl methacrylate (PMMA) blend films (<70 nm) on SiOx substrates upon annealing were investigated by atomic force microscopy (AFM) and some interesting phenomena were observed. All the spin-coated PS/PMMA blend films were not in thermodynamic equilibrium. For the 67.1 and the 27.2 nm PS/PMMA blend films, owing to the low mobility of the PMMA-rich phase layer at substrate surfaces and interfacial stabilization caused by long-range van der Waals forces of the substrates, the long-lived metastable surface morphologies (the foam-like and the bicontinuous morphologies) were first observed. For the two-dimensional ultrathin PS/PMMA blend film (16.3 nm), the discrete domains of the PS-rich phases upon the PMMA-rich phase layer formed and the secondary phase separation occurred after a longer annealing time. 相似文献
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在吲哚俘精酰胺/PMMA薄膜上记录了同偏振全息和正交偏振全息图,获得了它们的再现衍射像.实验结果表明:吲哚俘精酰胺具有光致各向异性,可以进行正交偏振全息记录.在偏振全息中,衍射光的偏振方向依赖于物光和再现光的偏振方向,衍射像的噪声主要来源于再现光照射到样品上引起的散射.正交偏振全息可以得到比同偏振全息更高信噪比的衍射像.存储于样品上的全息图在室温下黑暗处至少可以保存五个月而衍射效率无明显下降.结果表明,吲哚俘精酰胺是一种可用于偏振全息的可擦重写记录介质.
关键词:
偏振全息
光致各向异性
俘精酸酐
光致变色 相似文献
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Pixel-matched holographic data storage with megabit pages 总被引:5,自引:0,他引:5
Shelby RM Hoffnagle JA Burr GW Jefferson CM Bernal MP Coufal H Grygier RK Günther H Macfarlane RM Sincerbox GT 《Optics letters》1997,22(19):1509-1511
Digital data-page holograms consisting of 1024 x 1024 arrays of binary pixels have been stored and subsequently retrieved with an optical exposure consistent with a data rate 1 Gbit /s. Each input pixel was precisely registered with a single detector pixel, and a raw bit-error rate as low as 2.4 x 10(-6) was demonstrated with global-threshold detection. To our knowledge, this is the first demonstration of the often-cited goal of holographic data storage of megabit data pages and a gigabit-per-second data rate. 相似文献
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We present our studies on the photopolymer of poly(methyl methacrylate) (PMMA) doped with 9,10-phenanthrenequinone based derivatives for volume holographic storage. By introducing different functional groups on the side-chain of 9,10-phenanthrenequinone molecule, the holographic characteristics of the material can be modified. The photoreaction involved with the holographic recording in the samples was investigated by measuring UV-Vis absorption spectrum and mass spectrum. The experimental results show that the similar behaviors were exhibited in these photopolymers. It is found that phase hologram recording in our PQ derivatives doped PMMA photopolymer involves a structure change of the quinone based molecule, which induces a strong change of the refractive index. Experimental characterizations on holographic data storage, including material sensitivity, dynamic range (M#) and bit-error-rate have been performed. We found that, by selecting appropriate functional groups, an improvement in sensitivity and M# for holographic data storage can be achieved. 相似文献
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Ruggedized digital holographic data storage with fast access 总被引:2,自引:0,他引:2
Recent investigations in holographic mass memory systems have produced proof-of-concept demonstrations that have highlighted their potential for providing unprecedented capacity, data transfer rates and fast random access performance (Heanue et al. 1994; Hong et al. 1995; Psaltis and Mok 1995; Bernal et al. 1996; McMichael et al. 1996). The exploratory nature of most such investigations has been largely confined to benchtop experiments which have ignored the practical constraints of packaging and environmental concerns. We have embarked on an effort to demonstrate the holographic mass memory concept by developing a compact prototype system geared for avionics and similar applications which demand the following features (mostly interdependent factors): (1) solid state design (no moving parts), (2) fast data seek time, (3) robust with respect to environmental factors (temperature, vibration, shock). In this paper, we report on the development and demonstration of two systems, one with 100 MB and the other with more than 1 GB of storage capacity. Both systems feature solid state design with the addressing mechanism realized with acoustooptic deflectors that are capable of better than 50 sec data seek time. Since the basic designs for the two systems are similar, we describe only the larger system in detail. The operation of the smaller system has been demonstrated in various environments including hand-held operation and thermal/mechanical shock; a photograph of the smaller system is provided, as well as actual digital data retrieved from the same system. 相似文献
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从理论上推导了球面波作为参考光和读出光时体全息存储的相对衍射效率和晶体旋转角度之间的关系,对得到的衍射效率的理论公式进行了数值模拟,并且对模拟的结果进行了分析。结果表明,球面波系统的存储容量更高,角度选择性更好,并且有利于系统的小型化。 相似文献
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We describe and demonstrate a volume holographic storage system in which a phase-conjugate object beam is reconstructed by the same reference beam that was used for recording. An intermediate hologram is used as a temporary buffer, recorded with its own reference beam and the data-bearing object beam. Reading this buffer hologram with the phase conjugate of its reference beam reconstructs the phase conjugate of the object beam, which can then be recorded into the desired volume hologram for long-term storage. This method combines the immunity to lens aberrations provided by phase-conjugate readout with the simplicity of using the same multiplexed reference beam for both recording and readout. Only a single pair of phase-conjugate reference beams is required. Experimental results are shown with a single LiNbO(3):Fe crystal used as both buffer and storage holograms and a self-pumped phase-conjugate mirror in BaTiO(3) that provides the pair of phase-conjugate reference beams. 相似文献