Abstract
A series of organically modified sol–gel films with various acceptor groups were prepared and characterized. All the chromophores exhibit much larger microscopic optical nonlinearity compared with the classical chromophore DR1 in solvatochromic measurement. Using in situ second harmonic generation (SHG) technique, the optimal poling temperatures (T opt) for sol–gel films were obtained. The second harmonic coefficients (d 33) of hybrid films at the wavelength of 1,064 nm were in the range of 50.1–70.3 pm/V after corona poling under their T opt. The NLO stabilities of these poled films were also investigated by tracing the d 33 value as a function of temperature and time. One of the hybrid films, which was prepared from chromophore 2,4-dinitro-4′-(N,N-dihydroxyethyl) aminoazobenzene exhibited a combination of large optical nonlinearity and high NLO stability. Furthermore, the effects of molecular structure on the NLO property and thermal stability of the hybrid films were also discussed.
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Acknowledgments
The authors gratefully acknowledge the financial support for this work from PCSIRT, the National Natural Science Foundation of China (under Grant Nos. 50532030 and 50625206), the China Postdoctoral Science Foundation (No. 20060400310) and the Postdoctoral Research Project of Zhejiang Province (No. 2006-bsh-01).
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Cui, Y., Qian, G., Chen, L. et al. Effect of pendant group on the second-order optical nonlinearity of sol–gel films. J Sol-Gel Sci Technol 47, 252–259 (2008). https://doi.org/10.1007/s10971-008-1797-x
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DOI: https://doi.org/10.1007/s10971-008-1797-x