共查询到20条相似文献,搜索用时 93 毫秒
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《中国光学与应用光学文摘》2004,(4)
研究了光信息记录材料介质和纳米物理显影核,两者均属于信息记录材料领域研究的热门课题。随着材料科学、光存储技术的发展,国内外对光存储介质的研究不断深人。文章对全息、光谱烧孔、电子俘获、双光子、光致变色 相似文献
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全息光存储以其高密度、大容量、高速并行数据存取而成为光存储领域的一个重要研究方向。生物光致变色材料———菌紫质是一种新型可擦重写全息记录介质。实验证明了使用菌紫质薄膜进行角度复用和偏振复用全息存储的可行性。利用菌紫质的光致变色特性,采用90°角度复用全息存储光路,在BR-D96N薄膜样品同一位置上实现了6幅全息图存储,并分别读出了无串扰的再现像。利用菌紫质薄膜的光致各向异性进行了偏振复用全息存储,在BR-D96N薄膜样品的同一位置上存储了两幅正交偏振光记录的图像,用原参考光再现和偏振片选择,可分别读出这两幅图像。 相似文献
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介绍了可用于可录、可擦除、全息光存储及超分辨掩膜层的氧化物、次氧化物薄膜材料的种类、制备方法、光存储特性和存储机制。这类薄膜材料由于具有种类多、应用范围广、制备方法多样、写入灵敏度高和记录稳定性好等优点 ,正受到各国研究者越来越多的关注。分析总结了这类材料的研究现状、存在的主要问题和未来发展方向 相似文献
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光谱烧孔型全息存储因高密度、抗干扰、低能耗的特点而具备了海量“冷数据”存储潜力。本文结合作者的科研经历,首先简要回顾了光谱烧孔的发展历程和存在瓶颈;随后基于等离激元光谱烧孔的基本原理,阐述了过渡金属氧化物/贵金属功能基元室温全息光谱烧孔的新思想;继而展示了作者在大面积全息盘片研制和小型化全息存储器开发方面的最新成果;最后对未来利用功能基元空间序构实现高密度频域全息光谱烧孔进行了展望。作者所在团队的系列工作开辟了高密度光存储的新方向,同时为发展过渡金属氧化物基高集成光电器件提供了有益的思路。 相似文献
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由于菌紫质样品的饱和吸收特性,在全息记录中,当记录光强大于样品的饱和光强时,全息光栅透过率随记录光相位差的分布远离余弦型,因此衍射效率的稳定值很低.菌紫质样品在红光和紫光共同作用下存在着双光束互补抑制效应,紫光可以抑制红光的透过率,提高红光的饱和光强,使记录区域由非线性区移至线性区,从而使全息光栅透过率随记录光相位差的分布变为余弦型,可以有效地提高全息衍射效率.实验证明,辅助紫光大大提高了菌紫质样品全息衍射效率的稳定值.根据此原理,建立了三光束全息光存储系统,在红光记录全息图的同时加入辅助紫光,可以使全息图衍射效率及衍射像的像质得到提高.
关键词:
菌紫质
全息存储
衍射效率
饱和吸收 相似文献
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V. A. Barachevsky 《Optics and Spectroscopy》2018,124(3):373-407
The results of studies that have been performed over the last decade in the field of development of silver halide and nonsilver holographic recording media of organic and inorganic origin are analyzed. It is shown that previously developed materials mainly allow the development of holographic investigations. Among irreversible materials, considerable progress has been made in improving the characteristics of photopolymerizable recording media, which has allowed their use in color image holography and 3D optical archive-type memory, as well as for fabricating holographic optical elements. In the field of improving the properties of reversible holographic recording media, practically significant results have been obtained for the creation of photoanisotropic materials based on azo dyes experiencing cis–trans photoisomerization, which allow the recording of polarization holograms. The needs of dynamic holography have been satisfied by lightsensitive doped inorganic crystals and polymer layers that have been created with nonlinear optical properties. 相似文献
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Yanjie Zhang Zifeng Lu Xuefeng Deng Yichun Liu Yingying Zhao 《Optics Communications》2003,220(4-6):289-295
Holographic gratings were optically recorded by two beams from a He–Ne laser operating at 632.8 nm in poly (methyl methacrylate) (PMMA) film containing push–pull azo dye. The holographic characteristics of the recorded gratings were dependent on the polarization direction of the recording beams and the relationship between the diffractive signals and the power density of recording beams was investigated. The formation of holographic gratings accompanied by 532 nm (double-frequency of Nd:YAG laser) irradiation was studied in detail. It was found that the effect of 532 nm laser to the holographic grating lay in two aspects. The acceleration effect of 532 nm laser to the formation of holographic grating is predominant when the power density of 532 nm laser is low. While at relatively high power density of 532 nm laser, the erasure is the main factor to the holographic grating. Moreover, the holographic grating was probed by 532 nm laser at low power density and the dependence of the first order diffractive signal on the recording beam power density was also presented. 相似文献
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We describe a fast optical recording material based on a dye-doped polymer-dispersed liquid-crystal film. A holographic grating is written in this film with a single Q -switched Nd:YAG laser pulse that has a duration of ~6 ns . Such a grating is due to the reorientation effect of the liquid-crystal molecules through interaction with the photoinduced adsorption of the doped azo dyes. Experimental results indicate that the grating thus formed is permanent but electrically switchable. 相似文献
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利用全息技术在偶氮聚合物薄膜中记录了拓扑荷数q=–1,1,2,4的涡旋光场,并将记录的原始叉形光栅与计算全息光栅进行对比,对不同拓扑荷数涡旋光的记录速率和偶氮材料的可重复擦写性能进行了测试;记录完成后,将复现涡旋光与高斯光束干涉,并与原始涡旋光和原始叉形光栅对比,分析了记录质量.实验结果表明:高阶涡旋光场的全息叉形光栅会在记录过程中发生劈裂,轻微劈裂的涡旋光束仍维持一个稳定的环状结构;全息记录过程中不同拓扑荷数的涡旋光束记录速率较为统一,偶氮材料可经过上百次的擦写而不出现疲劳;再现涡旋光与原始涡旋光在光强分布结构上保持高度一致,再现涡旋光的干涉条纹与原始涡旋全息光栅保持高度一致,涡旋光及其携带的拓扑荷信息可被有效记录和读取. 相似文献
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Surface relief holographic gratings are fabricated on the polybutadiene-coated walls of a cell filled with an aqueous solution of an azo-dye-labeled phospholipid. A low power (2 mW) 488 nm argon ion laser wavelength is used. Laser-excited azo dye reacts to produce a permanent surface-relief pattern on the polybutadiene substrate. Gratings are recorded for varying concentrations of the phospholipid solution as well as laser intensity. Lithographic masks are used to show that the photochemical pattern on the substrate is an exact replica of the light intensity distribution, and so the technique can be used for holographic recording as well as for biomolecular applications. 相似文献
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The photorefractive sensitivity and the effective electron transport length in two-centre holographic recording
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In this paper the photorefractive sensitivity defined for single-centre holographic
recording is modified to adapt two-centre holographic recording. Based on the time
analytic solution of Kukhtarev equations for doubly doped crystals, the analytical
expression of photorefractive sensitivity is given. For comparison with
single-centre holographic recording and summing the electron competition effects
between the deeper and shallower traps, an effective electron transport length is
proposed, which varies with the intensity ratios of recording light to sensitive
light. According to analyses in this paper, the lower photorefractive sensitivity
in two-centre holographic recording is mainly due to the lower concentration of
unionized dopants in the shallower centre and the lower effective electron
transport length. 相似文献
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The goal of this paper is to use digital holographic imaging for sensing marine plankton in recording sampling volume. The process stage of this approach includes: wavefront recording using in-line holographic recording set up and numerical reconstruction using Fresnel approximation and convolution algorithm. So, by capturing hologram of marine plankton and reconstructing hologram, the recorded optical field of marine plankton is retrieved. Digital holographic imaging is an extremely powerful technique for the study of marine plankton fields as it allows instantaneous, noninvasive, high-resolution recording of substantial volumes. Finally, this paper presents that it is possible for digital holographic imaging system to sense marine plankton according to laboratory results. 相似文献
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N. A. Davidenko I. A. Savchenko I. I. Davidenko A. N. Popenaka A. N. Shumelyuk V. A. Bedarev 《Technical Physics》2007,52(4):451-455
The electrooptic effect and the kinetics of recording/erasing the hologram of a plane wavefront in films of the 4-methacryloxy-(4′-carboxy-3′-oxy)azobenzene-cobalt polycomplex and 4-carboxy-3-oxy-3′-carboxy-4′-oxyazobenzene-cobalt polymer are studied. The electrooptic properties of the films depend on the reorientation of the polarized-light-induced dipole moments of azobenzene groups in an external electric field and, eventually, on forces acting on the azo groups and metal ions. It is found that the characteristic times of the electrooptic effect and holographic grating formation are longer in the polymer with an intrachain coordination of the metal ions. 相似文献