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

作　　者：孙香冰 任诠 王新强 张光辉 杨洪亮 冯林 许东 刘智波 

机构地区：[1]Department of Optics, Shandong University, Jinan 250100, China [2]State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China [3]Photonic Center, Institute of Physics, Nankai University, Tianjin 300071, China

出　　处：《Chinese Physics B》2006年第11期2618-2622,共5页中国物理B（英文版）

基　　金：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）.

摘　　要：The third-order optical nonlinearities of [（CH3）4N]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 γ for the [（CH3）4N]Au（dmit）2 molecule at 532nm is estimated to be as high as （2.1 ±0.1） × 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.The third-order optical nonlinearities of [（CH3）4N]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 γ for the [（CH3）4N]Au（dmit）2 molecule at 532nm is estimated to be as high as （2.1 ±0.1） × 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 

分 类 号：O43[机械工程—光学工程]