中国物理B ›› 2006, Vol. 15 ›› Issue (11): 2618-2622.doi: 10.1088/1009-1963/15/11/027

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Nonlinear optical properties of [(CH3)4N]Au(dmit)2 using Z-scan technique

孙香冰1, 任诠1, 杨洪亮1, 冯林1, 刘智波2, 王新强3, 张光辉3, 许东3   

  1. (1)Department of Optics, Shandong University, Jinan 250100, China; (2)Photonic Center, Institute of Physics, Nankai University, Tianjin 300071, China; (3)State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China
  • 收稿日期:2006-03-14 修回日期:2006-07-03 出版日期:2006-11-20 发布日期:2006-11-20
  • 基金资助:
    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).

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)   

  1. 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
  • Received:2006-03-14 Revised:2006-07-03 Online:2006-11-20 Published:2006-11-20
  • Supported by:
    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).

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摘要： 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 $\ga$ 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) $\ti$ 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.

关键词: third-order optical nonlinearity, organo-metallic compounds, $Z$-scan technique

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.

Key words: third-order optical nonlinearity, organo-metallic compounds, $Z$-scan technique

中图分类号:  (Optical susceptibility, hyperpolarizability)

  • 42.65.An
42.50.Gy (Effects of atomic coherence on propagation, absorption, and Amplification of light; electromagnetically induced transparency and Absorption) 42.65.Hw (Phase conjugation; photorefractive and Kerr effects) 42.65.Re (Ultrafast processes; optical pulse generation and pulse compression) 42.70.Jk (Polymers and organics)