Nonlinear optical properties of [(CH3)4N]Au(dmit)2 using Z-scan technique
Sun Xiang-Bing(孙香冰)a)†, Ren Quan(任诠)a)‡, Wang Xin-Qiang(王新强)b), Zhang Guang-Hui(张光辉)b), Yang Hong-Liang(杨洪亮)a), Feng Lin(冯林)a), Xu Dong(许东)b), and Liu Zhi-Bo(刘智波)c)
a Department of Optics, Shandong University, Jinan 250100, China; b State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China; c Photonic Center, Institute of Physics, Nankai University, Tianjin 300071, China
Abstract The third-order optical nonlinearities of [(CH$_3$)$_4$N]Au(dmit)$_2$ (dmit = 4,5-dithiolate-1,3-dithiole-2-thione) at 532 nm and 1064 nm are investigated using the $Z$-scan technique with pulses of picoseconds duration. The $Z$-scan spectra reveal a strong nonlinear absorption (reverse saturable absorption) and a negative nonlinear refraction at 532\,nm. No nonlinear absorption is observed at 1064 nm. The molecular second-order hyperpolarizability $\gamma$ for the [(CH$_3$)$_4$N]Au(dmit)$_2$ molecule at 532 nm is estimated to be as high as (2.1 $\pm$ 0.1) $\times$ 10$^{-31}$ esu, which is nearly three times larger than that at 1064\,nm. The mechanism responsible for the difference between the results is analysed. Nonlinear transmission measurements suggest that this material has potential applications in optical limiting.
Received: 14 March 2006
Revised: 03 July 2006
Accepted manuscript online:
Fund: Project supported by the National Natural Science Foundation of China (Grant Nos 60377016 and 60476020) and the National High Technology Development Program of China (Grant No 2002AA313070).
Cite this article:
Sun Xiang-Bing(孙香冰), Ren Quan(任诠), Wang Xin-Qiang(王新强), Zhang Guang-Hui(张光辉), Yang Hong-Liang(杨洪亮), Feng Lin(冯林), Xu Dong(许东), and Liu Zhi-Bo(刘智波) Nonlinear optical properties of [(CH3)4N]Au(dmit)2 using Z-scan technique 2006 Chinese Physics 15 2618
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