Holographic storage stability in PQ-PMMA bulk photopolymer
Holographic storage stability in PQ-PMMA bulk photopolymer
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DOI：
10.1016/j.optcom.2010.06.026
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发表时间：
2010-11-01
影响因子：
2.4
通讯作者：
Sun, Xiudong
中科院分区：
文献类型：
--
作者：
Yu, Dan;Liu, Hongpeng;Sun, Xiudong
实验研究了菲醌（PQ）掺杂聚甲基丙烯酸甲酯（PMMA）光致聚合物的全息存储稳定性。结果表明，这种稳定性包括两个连续的过程，即全息图的暗增强和衰减，分别对应于PQ及其光产物分子的扩散。在暗增强过程中，观察到角度选择性的布拉格失谐。因此，有必要通过调整读出角度来获得稳定的全息图质量。达到稳态后，全息图的长期稳定性取决于光产物的扩散。温度是长期稳定性的重要参数，它可以带来足够的能量，增加光产物的扩散，降低稳定性。最后提出了低温和均匀曝光作为优化暗增强后储存稳定性的替代方法。而且湿度对贮存稳定性的影响可以忽略不计。(C)2010 Elsevier B.V.保留所有权利。
Holographic storage stability is investigated experimentally in phenanthrenequinone (PQ) doped poly-(methyl methacrylate) (PMMA) photopolymer with high thickness and rigid polymer matrix. It is demonstrated that the stability consists of two continuous processes, dark enhancement and decay of holograms, which are corresponding to the diffusion of PQ and its photoproduct molecules, respectively. During dark enhancement the Bragg detuning of angle selectivity is observed. Therefore it is necessary to obtain steady holograms quality by adjusting the readout angle. After reaching steady state, the long-term stability of holograms is determined by the diffusion of photoproducts. Temperature is a most significant parameter for long-term stability, which can bring sufficient energy to increase the diffusion of photoproducts and reduce the stability. Finally low temperature and uniform exposure as alternative methods are proposed to optimize the storage stability after dark enhancement. Moreover the influence of humidity on the storage stability is neglectable. (C) 2010 Elsevier B.V. All rights reserved.