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 (Δn), or both.
© 2004 Optical Society of America
(050.7330) Diffraction and gratings : Volume gratings
(090.2900) Holography : Optical storage materials
(160.6060) Materials : Solgel
(210.4810) Optical data storage : Optical storage-recording materials
Gonzalo Ramos, Alberto Álvarez-Herrero, Tomas Belenguer, Francisco del Monte, and David Levy, "Shrinkage Control in a Photopolymerizable Hybrid Solgel Material for Holographic Recording," Appl. Opt. 43, 4018-4024 (2004)