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Erasure mechanisms of polarization holographic gratings in spirooxazine‐doped polymer films
Author(s) -
Fu Shencheng,
Hu Weilin,
Xie Minggui,
Liu Yichun,
Duanmu Qingduo
Publication year - 2008
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.29196
Subject(s) - erasure , diffraction efficiency , materials science , holography , grating , polymer , chromophore , polarization (electrochemistry) , optics , holographic grating , doping , thermal stability , diffraction , optoelectronics , diffraction grating , azobenzene , photochemistry , composite material , chemistry , physics , organic chemistry , computer science , programming language
Dynamic holographic recording under linear polarized writing beams at 632.8 nm was performed on two different new spirooxazine doped PMMA matrices assisted by UV light. Thermal rate constants of the two holographic storage medium were determined. It was found that diffraction efficiency and erasure dynamics of the holographic gratings in the two polymer films were dependent on the thermal stability and aggregation of spirooxazine molecules in PMMA matrices. During erasure of the holographic gratings, only in the polymer film with a lower thermal rate constant, a nearly instantaneous increase of diffraction efficiency was observed, resulting from the formation of a transient orientation grating. A theoretical description of the transient orientation grating, competing with isomerization gratings, agrees well with experimental results. The interaction between the chromophores and matrices was also discussed. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2009