Fabrication and Characterization of poly (methyl methacrylate) photopolymer doped with quinone-based photosensitive molecules for volume holographic recording

• Main Authors: Po-lin Chen, 陳柏霖
• Other Authors: Wha-TzongWhang
• Format: Others
• Language: zh-TW
• Published: 2005
• Online Access: http://ndltd.ncl.edu.tw/handle/06634336468632282063

碩士 === 國立交通大學 === 材料科學與工程系所 === 93 === In this thesis, we investigate several novel poly(methyl methacrylate)(PMMA) photopolymers doped with different quinone-based molecules for volume holographic recording .Chemical analyses are performed to study on physical mechanism of holographic recording .In addition , the materials are characterized experimentally for holographic data storage application. In material fabrication, four different quinine-based molecules: 9,10-phenanthrenequinone(PQ),1-isopropyl–7–methyl –9,10–phenanthrenequinone (PQ1), 2-nitro phenanthrenequinone (PQ2), 11,12 – Dihydrochrysene - 11,12- Dione (PQ3,) are chosen. One of them and thermal -initiator azobisisobutyronitrile ( AIBN ) are dissolved into the purified methyl methacrylate( MMA)solution . By controlling synthesis temperature, time , processes for preparing glass cell, the solution can be transformed into well-polymerized bulk with dimensions of 10cm x 10cm and thickness of 2mm. In chemical analyses, we perform mass spectrum experiments of those samples after optical exposure with 514nm laser light by using UV and GC-MASS. The results show that all of the different quinine- based PQ molecules can be reacted with residual monomer in the form of one-by-one compound, which are similar with the previous reported works. It indicates that we can reasonably assume the physical mechanism of holographic recording in our samples is similar with the previous reported results. In holographic characterizations, we measure the temporal response of diffraction efficiency of hologram recorded in each sample. By using typical two-wave-mixing recording setup .In addition ,the material M/# of each sample is measured by recording multiple holograms with peristrophical multiplexing technique. The results show that inducing different functional groups, we obtain distinct diffraction efficiency ,response time(sensitivity) and M/#(dynamic range).According to these results ,we try to find out the relevance between the chemical structure and holographic behavior of these different samples, which provide us a trend method to optimize these quinone-based molecules doped PMMA photo polymer for volume holographic data storage.