Optical Kerr Shutter Utilizing Symmetrical Π-Conjugated Dyes Dispersed in PMMA

Naoki OOBA  Hirohisa KANBARA  Satoru TOMARU  Takashi KURIHARA  Toshikuni KAINO  

IEICE TRANSACTIONS on Electronics   Vol.E77-C   No.5   pp.689-693
Publication Date: 1994/05/25
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Section on Organic Functional Devices)
organic material,  optical nonlinearity,  doped polymer,  optical switch,  Kerr shutter,  

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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 χ values were dispersed. The solubilities of the SBAC dyes were increased by controlling their polarity and bulkiness. As the dye concentration was increased, the χ of the doped PMMA increased to as large as 2.61013 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 n2 value of doped PMMA with a χ value of 1.51013 esu was found to be 9.11015 cm2W1.