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 im- early polarised 488 nm light show that for polymers with an azo content of 20%, 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 flot 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 2O% in weight, the stored gratings are stable. A diffraction efficiency higher than 90% and an angular selectivity of 40 have been achieved in gratings with aperiod of 2 ism. It can be concluded that the di-block copolymer with 20 wt% azo content is the most suitable, among tie’studiedcopoIymers, as volume holographic storage material.
|Journal||European Polymer Journal|
|Publication status||Published - 2007|
- Liquid crystal polymer
- Block copolymer