Abstract
This work proposed a new kind of photosensitizer doped photopolymer and an optimized fabrication method. Holographic gratings are recorded in a glass-like photopolymer based on methyl methacrylate (MMA) as monomer, 2,2-azo-bisisobutyrolnitrile (AIBN) as thermo-initiator and a cationic initiator with high sensitivity and solubility, titanocene (Irgacure 784, BASF) (TI), as photo-initiator. In our fabrication, an optimized three-step thermal-polymerization method is investigated and depicted. 3 mm thick TI/PMMA photopolymers with different concentrations of AIBN and TI molecules are examined in detail. The photo-physical and photo-chemical processes inside the sample during continuous exposure are analyzed. In our photopolymers, permanent volume holographic gratings with diffraction efficiency approaching 74% and response time close to 20s, which makes this photopolymer available in volume holographic data storage.
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