Large optical nonlinearities of new organophosphorus fullerene derivatives |
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Authors: | Liu Zhi-Bo Tian Jian-Guo Zang Wei-Ping Zhou Wen-Yuan Zhang Chun-Ping Zheng Jian-Yu Zhou Ying-Chun Xu Hua |
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Affiliation: | Photonics Center, College of Physics, Nankai University, Tianjin 300071, China. |
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Abstract: | Optical nonlinearities of five new organophosphorus fullerene derivatives with similar structures were determined by the Z-scan method by use of a nanosecond-pulse laser at 532 nm. The experimental results demonstrate that the five derivatives have much larger excited-state absorption and nonlinear refraction than C60. The excited-state absorption cross sections are nearly two to three times that of C60. Using a five-level model to fit the experimental data, we obtained some parameters such as excited-state absorption and refraction cross sections. A simple analysis of correlations between molecular structure and nonlinear properties is given. Optical nonlinearities of the five new organophosphorus fullerene derivatives were compared with those of some other kinds of fullerene derivatives, and the results show that the nonlinearities of the new derivatives are the larger. |
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