Methacryluic Azopolymers for Holographic Storage: A Comparison among Different Polymer Types

Patricia Forcén, Luis Oriol, Carlos Sánchez, Francisco J. Rodriguez, Rafael Alcala, Søren Hvilsted, Katja Jankova Atanasova

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

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.
Original languageEnglish
JournalEuropean Polymer Journal
Pages (from-to)3292-3300
ISSN0014-3057
Publication statusPublished - 2007

Keywords

  • Holography
  • Liquid crystal polymer
  • Block copolymer
  • Azopolymer

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