19 October 2001 Role of combined bridge on the second-order nonlinear optical properties of organic stilbazolium salts
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Proceedings Volume 4580, Optoelectronics, Materials, and Devices for Communications; (2001) https://doi.org/10.1117/12.444928
Event: Asia-Pacific Optical and Wireless Communications Conference and Exhibit, 2001, Beijing, China
Abstract
The second-order nonlinear optical (NLO) properties of three new organic stilbazolium salts (denoted by Dye1, Dye2 and Dye3) were studied by hyper-Rayleigh scattering (HRS) technique. Dye2 and Dye3 are dichromophoric systems of Dye1 with combined bridges of different lengths. Because all the samples are ionic species, the classical technique electric- field-induced second-harmonic generation (EFISHG) can not be used to measure their first hyperpolarizabilities (beta) . Further studies showed that the measured (beta) values were greatly enhanced due to the multi-photon fluorescence (MPF) emissions at 532nm, and more accurate (beta) could be estimated after grossly cutting off the MPF from their spectra. It shows that the stilbazolium salts are good candidates with very large first hyperpolarizabilities (in the range of 10-27esu) for optoelectronic applications. The results revealed the dependence of (beta) on the molecular structures such as number of chromophore, (pi) -conjugation length and molecular conformation in the solution of dimethylformamide. The two level mode was used to predict the intrinsic molecular hyperpolarizabilities of these samples.
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Xin Wang, Xin Wang, Yiping Cui, Yiping Cui, Yaochun Shen, Yaochun Shen, Zu-Hong Lu, Zu-Hong Lu, Fanqing Meng, Fanqing Meng, Xu Dong, Xu Dong, } "Role of combined bridge on the second-order nonlinear optical properties of organic stilbazolium salts", Proc. SPIE 4580, Optoelectronics, Materials, and Devices for Communications, (19 October 2001); doi: 10.1117/12.444928; https://doi.org/10.1117/12.444928
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