Theoretical model of photoinduced anisotropy in liquid-crystalline azobenzene side-chain polyesters

Thomas Garm Pedersen, Per Michael Johansen, N.C.R. Holme, P.S. Ramanujam, Søren Hvilsted

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

A theoretical framework for the temporal behavior of photoinduced anisotropy in liquid-crystalline azobenzene side-chain polyesters is constructed. The domain structure of the material is taken into account and inter molecular interactions are included through a mean-field description. Photoinduced trans cis isomerization is taken as the dominating source of chromophore reorientation events, and it is demonstrated how this mechanism in conjunction with the multidomain picture is able to account for the long-term stability of the anisotropy. The photoinduced birefringence is calculated by means of a truncated basis method, and in addition the photostationary solution is obtained. Comparison between theory and experiment shows excellent agreement in the entire range of intensities used experimentally.
Original languageEnglish
JournalOptical Society of America. Journal B: Optical Physics
Volume15
Issue number3
Pages (from-to)1120-1129
ISSN0740-3224
DOIs
Publication statusPublished - 1998

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