Journal
DYES AND PIGMENTS
Volume 71, Issue 2, Pages 138-144Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.dyepig.2005.04.019
Keywords
nonlinear optical; azo dyes; Z-scan; hydrogen bond; synthesis; chromophore
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Three conjugated molecules', 4-phenylethynyl-4'-[N,N-diethylamino]azobenzene (3a), 4-phenylethynyl-4'-{[N-ethyl-N-(2-hydroxyethyl)]amino}azobenzene (3b), and 4-phenylethynyl-4'-[N,N-di(2-hydroxyethyl)amino]azobenzene (3c), nonlinear optical properties were determined using Z-scan technique with 532 mu, 8 ns laser pulses. The results indicate that these compounds possess large nonlinear optical absorptions, which are attributed to the long pi-conjugation structure owing to the substituent of phenylethynyl group. The nonlinearity increases with an increase in the number of hydroxyl group, due to the regular arrangement induced by the strong hydrogen bond interaction between hydroxyl groups of molecules. Their nonlinearity enhancement mechanism was studied by FT-IR spectroscopy. (c) 2005 Elsevier Ltd. All rights reserved.
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