Third-order nonlinear optical properties of Co(dmit)2 complexes using Z-scan technique

Quan Ren, Xi Zhang, Xiang Bing Sun, Xin Qiang Wang, Wen Feng Guo, Hong Liang Yang, Fu Jun Zhang, Dong Xu

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations


Three novel dmit2- complexes: [(CH3) 4N][Co(dmit)2],[(C3H7) 4N][Co(dmit)2] and [(C4H9) 4N][Co(dmit)2], (abbreviated as MeCo, PrCo and BuCo, respectively and dmit2-=4,5-dithiolate-1,3-dithiole-2-thione), were synthesized and the third-order optical nonlinearities of their acetone solution of the same concentration were characterized by Z-scan technique at the wavelength of 1064 nm with laser duration of 40 ps. Their Z-scan curves all revealed a negative nonlinear refraction and a positive absorption at 1064nm.The molecular second hyperpolarizability γ of MeCo, PrCo and BuCo are 5.11×10-31,4.99×10-31,5.60×10 -31 (esu), respectively. The linear absorption coefficients a and the nonlinear absorption coefficient β of them are 0.3, 0.25, 0.32 (cm -1) and 1.53×10-12, 1.38×10-12, 1.85×10-12 (cm/W), respectively. The experiment results suggested that complexes with stronger linear absorption have larger nonlinear absorption and two-photon absorption. This difference is due to near resonant effect of sample with stronger absorption. So the linear absorption of complexes at 1064nm is a significant factor to influence the nonlinear absorption. These samples' large nonlinear absorption suggests that these materials have potential application in optical limiting.

Original languageEnglish (US)
Title of host publicationNonlinear Optics
Subtitle of host publicationTechnologies and Applications
StatePublished - 2008
EventNonlinear Optics: Technologies and Applications - Beijing, China
Duration: Nov 12 2007Nov 13 2007

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X


OtherNonlinear Optics: Technologies and Applications

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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