Methacrylic azopolymers for holographic storage: A comparison among different polymer types

作者：Forcen Patricia; Oriol Luis; Sanchez Carlos; Rodriguez Francisco J; Alcala Rafael^*; Hvilsted Soren; Jankova Katja

来源：European Polymer Journal, 2007, 43(8): 3292-3300.

DOI：10.1016/j.eurpolymj.2007.05.004

• azopolymer
• block copolymer
• holography
• liquid crystal polymer

The photoinduced anisotropy and volume holographic storage in a series of polymers with different architectures and azo contents of 7% and 20% in weight have been investigated. Measurements of the birefringence (An) induced with nearly polarised 488 nm light show that for polymers with an azo content of 200%, the highest and more stable An values are achieved in copolymers with a di-block architecture. The An induced in polymers with 7 wt% azo content is not stable. Volume holographic polarisation gratings have been stored in the polymers. Only in the case of the di-block copolymer with an azo content of 20% in weight, the stored gratings are stable. A diffraction efficiency higher than 90% and an angular selectivity of 4 degrees have been achieved in gratings with a period of 2 mu m. It can be concluded that the di-block copolymer with 20 wt% azo content is the most suitable, among the studied copolymers, as volume holographic storage material.

• 出版日期2007-8