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7 March 2014 Triphenylamine-based acrylate polymers for photorefractive composite
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Two kinds of triphenylamine (TPA)-based acrylate polymer are applied to photorefractive (PR) composite. Poly(4- (diphenylamino)benzyl acrylate) (PDAA) have TPA moiety attached to acrylate main chain. Poly(4-((4- methoxyphenyl)(phenyl)amino)benzyl acrylate) (PMPAA) has a similar structure with a side chain of TPA derivative modified with a methoxy group at para position. PMPAA shows even more readily ionized than PDAA. TPA plasticizer is used instead of the conventional N-ethylcarbazole plasticizer to improve the photoconductivity. A series of composite based on two kinds of acrylate polymer have been prepared and investigated by degenerate four-wave mixing. With the polymer concentration of 55 and 50 wt%, the composite using modified-TPA-polymer of PMPAA shows significant improvement in diffraction efficiency and response time. When polymer concentration is reduced to 45 wt%, the PDAA composite shows a large PR enhancement. With 532 nm laser, diffraction efficiency reaches 70% and 40% for PDAA and PMPAA composites, respectively.
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Ha N. Giang, Kenji Kinashi, Wataru Sakai, and Naoto Tsutsumi "Triphenylamine-based acrylate polymers for photorefractive composite", Proc. SPIE 8983, Organic Photonic Materials and Devices XVI, 89831E (7 March 2014);

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