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Shrinkage control in a photopolymerizable hybrid solgel material for holographic recording

2004; Optica Publishing Group; Volume: 43; Issue: 20 Linguagem: Inglês

10.1364/ao.43.004018

0003-6935

G. Ramos, A. Álvarez‐Herrero, Tomás Belenguer, Francisco del Monte, David Lévy,

Liquid Crystal Research Advancements

We report the correction of the shrinkage observed during UV postrecording curing in a holographic solgel material that was recently achieved by the use of various chemical formulations for the composition of the hybrid supporting matrix. We found that a chemical modification of the matrix noticeably attenuates the shrinkage (from 1.3% to 0.4% of the material's initial thickness with the inclusion of just 20% tetramethylorthosilicate), providing a material with improved stability for permanent data storage applications. The holographic properties of samples with different binders are also reported. In addition, a theoretical study has revealed the way by which to compensate for angular deviation in the Bragg condition during UV postrecording by tailoring the binder shrinkage (s), the maximum refractive-index modulation capability of the photosensitive mixture (deltan), or both.