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The PR performance was evaluated through diffraction efficiency, response and decaying time. These parameters could be obtained by applying d. egenerated four waves mixing method | Tạp chí Khoa học công nghệ và Thực phẩm 13 (1) (2017) 32-38 PHOTOREFRACTIVE COMPOSITES BASED ON ACRYLATE AND STYRENE TYPES OF TRIPHENYLAMINE POLYMER Giang Ngoc Ha1, *, Vu Bao Khanh2, Nguyen Huu Vinh2, Bach Long Giang2 1 2 Ho Chí Minh City University of Food Industry, NTT Hi-Tech Institute, Nguyen Tat Thanh University * Email: giangngocha@gmail.com Received: 26 September 2017; Accepted for publication: 30 November 2017 ABSTRACT Two types of photorefractive (PR) composite based on acrylate and styrene type of triphenylamine polymer were fabricated. The PR performance was evaluated through diffraction efficiency, response and decaying time. These parameters could be obtained by applying degenerated four waves mixing method. The composite based on styrene type had faster response and decaying time while diffraction efficiency was only 16 %. The composite using acrylate type had slightly slow response results. However, the diffraction efficiency could reach 30 % and shelf-life was significantly improved. Keywords: Composite, triphenylamine, photorefractive, polymer. 1. INTRODUCTION Photorefractive (PR) polymer and composite, a fascinating materials for photonic applications, has attracted wide attention from optics and photonics researchers [1]. Owing to ability to continuously update holographic data, the material was considered as one of the potential approaches toward real-time three-dimensional display [2-5]. For a material which can perform PR effect, it must possess two characteristics, i.e. photoconductivity and nonlinear optical (NLO) property. These two are combined into a material by several ways [1, 6, 7]. However, the PR material under the form of a composite has been proven to be a versatile and feasible method. A chromophore, a birefringent molecule with high polarity, is added to create NLO property which is ability of changing refractive index under the affection of electric field. A photoconductive polymer is usually used as a dispersive matrix for
