Shrinkage control in a photopolymerizable hybrid solgel material for holographic recording.

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.

[1]  Gonzalo Ramos,et al.  Photopolymerizable hybrid sol-gel material for holographic recording , 2003, SPIE Optics + Photonics.

[2]  A. A. Friesem,et al.  Organic materials for real-time holographic recording , 1997 .

[3]  L. Dhar,et al.  Photopolymer-filled nanoporous glass as a dimensionally stable holographic recording medium. , 1999, Optics letters.

[4]  Marcia L. Schilling,et al.  Acrylate Oligomer-Based Photopolymers for Optical Storage Applications , 1999 .

[5]  Brian H. Marcus,et al.  Holographic data storage technology , 2000, IBM J. Res. Dev..

[6]  Timothy J. Trentler,et al.  Effect of film thickness on the performance of photopolymers as holographic recording materials. , 2000, Applied optics.

[7]  Gonzalo Ramos,et al.  Sol-gel approach for the preparation of holographic and photorefractive materials , 2002, Optics + Photonics.

[8]  Rupak Changkakoti,et al.  Polymer holograms for neural network application: an experimental study , 1995, Defense, Security, and Sensing.

[9]  H. Imai,et al.  Densification of sol-gel thin films by ultraviolet and vacuum ultraviolet irradiations , 1997 .

[10]  Antonio Fimia,et al.  Highly sensitive photopolymerizable dry film for use in real time holography , 1998 .

[11]  Pavel Cheben,et al.  Bragg gratings in ORMOCERs , 1997, Optics & Photonics.

[12]  Melinda Schnoes,et al.  Temperature-induced changes in photopolymer volume holograms , 1998 .

[13]  Pavel Cheben,et al.  A photopolymerizable glass with diffraction efficiency near 100% for holographic storage , 2001 .

[14]  C. P. Grover,et al.  Preparation and Optical Characterization of Thick-Film Zirconia and Titania Ormosils , 1999 .

[15]  D Psaltis,et al.  Characterization of phenanthrenequinone-doped poly(methyl methacrylate) for holographic memory. , 1998, Optics letters.

[16]  Vicki L. Colvin,et al.  Epoxy Resin-Photopolymer Composites for Volume Holography , 2000 .

[17]  T Belenguer,et al.  Holographic diffraction gratings recording in organically modified silica gels. , 1996, Optics letters.

[18]  W S Colburn,et al.  Volume hologram formation in photopolymer materials. , 1971, Applied optics.

[19]  Stephan J Zilker.  Holographic data storage--the materials challenge. , 2002, Chemphyschem : a European journal of chemical physics and physical chemistry.