Acta Phys. -Chim. Sin. ›› 2012, Vol. 28 ›› Issue (04): 942-948.doi: 10.3866/PKU.WHXB201202201

• PHOTOCHEMISTRY AND RADIATION CHEMISTRY • Previous Articles     Next Articles

Third-Order Nonlinear Optical Properties of 1,3-Dithiole-2-thione- 4,5-dithiolate Compounds at Different Wavelengths

CHEN Jing-Wei1, REN Quan1, WANG Xin-Qiang2, YANG Xu-Dong1, LI Ting-Bin3, YANG Hong-Liang1, ZHU Lu-Yi2, ZHANG Jing-Nan1, LI Guo-Chao1   

  1. 1. Department of Optics, Shandong University, Jinan 250100, P. R. China;
    2. State Key Laboratory of Crystal Materials, Shandong University, Jinan, 250100, P. R. China;
    3. Department of Materials and Chemical Engineering, Taishan University, Tai'an 271021, Shandong Province, P. R. China
  • Received:2011-12-09 Revised:2012-01-16 Published:2012-03-21
  • Contact: CHEN Jing-Wei E-mail:chenjingwei@mail.sdu.edu.cn
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (60778037, 50772059, 11004123), Foundation of National Excellent Doctoral Dissertation of China (200539), Natural Science Foundation of Shandong Province, China (ZR2009GQ007), China Postdoctoral Science Foundation (20100470040), and Youth Scientist Fund of Shandong Province, China (BS2011CL025).

Abstract: Two novel 1,3-dithiole-2-thione-4,5-dithiolate compounds, benzyltriethylamine bis(2-thioxo-1,3- dithiole-4,5-dithiolato) aurate(III) (BTEAADT) and benzyltriethylamine bis(2-thioxo-1,3-dithiole-4,5- dithiolato) nickel(III) (BTEANDT), were prepared and their optical nonlinearities in acetonitrile solutions at 532 and 1064 nm were investigated using the Z-scan technique with picosecond laser pulses. The Z-scan curves revealed that BTEAADT exhibited mainly reverse saturable absorption at 532 nm, negligible nonlinear absorption at 1064 nm, and a self-defocusing effect at both wavelengths, which meant that the third-order nonlinear refractive index was negative. BTEANDT exhibited saturable absorption at 1064 nm, negligible nonlinear absorption at 532 nm, and a self-focusing effect at both wavelengths, which meant that the third-order nonlinear refractive index was positive. The reason for these different phenomena was analyzed. The third-order nonlinear refractive index, the third-order nonlinear absorption coefficient, the third-order nonlinear susceptibility, and the hyperpolarizability were obtained at 532 and 1064 nm. The nonlinear refractive indices were -1.685×10-18 m2·W-1 at 532 nm and -1.459×10-18 m2·W-1 at 1064 nm for BTEAADT and 1.452×10-18 m2·W-1 at 532 nm and 7.311×10-18 m2·W-1 at 1064 nm for BETANDT. The magnitudes of the third-order nonlinear absorption coefficient, the third-order nonlinear susceptibility, and the hyperpolarizability were 10-11 m·W-1, 10-13 esu, and 10-31 esu, respectively. All these results suggest that these materials are promising candidates for application in the nonlinear optical area.

Key words: Organometallic coordination compound, Z-scan technique, Nonlinear optical property, Nonlinear optical materials, All-optical switching

MSC2000: 

  • O644