Optical Kerr Shutter Utilizing Symmetrical П-Conjugated Dyes Dispersed in PMMA (Special Section on Organic Functional Devices)

概要

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The possibility of applying nonlinear optical organic materials to a high speed optical Kerr shutter was investigated. As switching materials, we chose doped PMMA, in which 2,5-dichloroterephthal-bis [(p-diethylamino) aniline] (SBAC; Symmetrically substituted Benzylidene Aniline) dyes with large x^<(3)> values were dispersed. The solubilities of the SBAC dyes were increased by controlling their polarity and bulkiness. As the dye concentration was increased, the x^<(3)> of the doped PMMA increased to as large as 2.6×10^<-13> esu. In addition, the extinction ratio of the doped PMMA, an important factor in Kerr shutter operation, was improved to 45 dB by investigating polymerization conditions and processes. As a result, optical Kerr shutter operation was observed in a doped polymer system for the first time, and the n_2 value of doped PMMA with a x^<(3)> value of 1.5×10^<-13> esu was found to be 9.1×^<-15> cm^2W^<-1>.
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1994-05-25