A photopolymerizable glass with diffraction efficiency near 100% for holographic storage
A photopolymerizable glass with diffraction efficiency near 100% for holographic storage
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DOI：
10.1063/1.1354665
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发表时间：
2001-03
影响因子：
4
通讯作者：
P. Cheben;M. L. Calvo
中科院分区：
文献类型：
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作者：
P. Cheben;M. L. Calvo
在光聚合有机改性石英玻璃中实现了永久性全息存储。通过将二茂钛光引发剂和高折射率丙烯酸单体分散在多孔二氧化硅基质中来制备玻璃。这种玻璃在适度暴露于绿色光时表现出前所未有的灵敏度和折射率变化，并且可以制造厚度达几毫米的玻璃。实际的全息存储装置需要具有良好全息特性的这种厚度的可光聚合存储介质。这种介质的缺乏一直被认为是发展一次写入全息存储器的主要障碍。在我们的玻璃中，我们已经存储了衍射效率接近100%和折射率调制高达4.5×10−3的永久体积全息图，使这种光聚合材料适用于全息数据存储。
Permanent holographic storage has been demonstrated in a photopolymerizable organically modified silica glass. The glass was prepared by dispersing a titanocene photoinitiator and a high refractive index acrylic monomer in a porous silica matrix. This glass exhibits unprecedented sensitivity and refractive index change upon a moderate exposure to green light and can be fabricated in thickness up to several millimeters. A photopolymerizable storage medium of such a thickness with good holographic properties is needed for practical holographic storage devices. Lack of such medium has been considered the main obstacle in development of write-once holographic memories. In our glass, we have stored permanent volume holograms of diffraction efficiency approaching 100% and refractive index modulation up to 4.5×10−3, making this photopolymerizable material suitable for use in holographic data storage.