Third-order nonlinear optical properties of unsymmetric pentamethine cyanine dyes possessing benzoxazolyl and benzothiazolyl groups
作者:Ru Sun、Bao-Long Yan、Jian-Feng Ge、Qing-feng Xu、Na-Jun Li、Xing-Zhi Wu、Ying-Ling Song、Jian-Mei Lu
DOI:10.1016/j.dyepig.2012.07.007
日期:2013.1
A series of unsymmetric pentamethine cyanine dyes featuring benzoxazolyl and benzothiazolyl groups were synthesized, the structures were characterized by H-1 NMR, UV-vis absorption spectroscopy and mass spectrometry. The dyes with different anions such as chloride, tetraphenylborate and tetra(4-fluorophenyl)borate were also obtained and their solubility can be changed by the choice of the anion part. The third-order nonlinear optical properties were measured by the Z-scan technique with a pico-second laser beam at 532 nm in DMF solution. The third-order nonlinear optical susceptibilities chi((3)) and the second-order hyperpolarizabilities gamma' were obtained. The results reveal that these dyes exhibit strong reverse saturable absorption and nonlinear refraction. (C) 2012 Elsevier Ltd. All rights reserved.
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