Preparation, crystal growth, characterization, thermal and third-order nonlinear optical properties of ethyltriphenylphosphonium bis(2-thioxo-1,3-dithiole-4,5-dithiolato)aurate(III) for all-optical switching

✍ Scribed by X.Q. Wang; Q. Ren; J. Sun; H.L. Fan; T.B. Li; X.T. Liu; G.H. Zhang; L.Y. Zhu; D. Xu

• Publisher: Elsevier Science
• Year: 2011
• Tongue: English
• Weight: 747 KB
• Volume: 324
• Category: Article
• ISSN: 0022-0248
• DOI: 10.1016/j.jcrysgro.2011.03.035

✦ Synopsis

A novel organometallic third-order nonlinear optical crystal: ethyltriphenylphosphonium bis(2-thioxo-1,3-dithiole-4,5-dithiolato)aurate(III) (ETPPADT) has been prepared, and large optical-quality single crystals have been grown by the solvent evaporation method. Its structural, optical and physicochemical properties are characterized by elemental analyses, UV-Vis-NIR transmission, infrared spectroscopy and thermal analysis. The thin films of ETPPADT doped into poly(methyl methacrylate) (PMMA) with a concentration of 1 wt% have been prepared using spin-coating method. The linear refractive index and the thickness of the thin films were measured by a prism coupler. The third-order nonlinear optical properties of the films have been investigated using Z-scan technique at the wavelength of 1064 nm with laser duration of 20 ps, which reveal that the composited films exhibit large negative nonlinear refractive indices about 4 Â 10 À 10 esu and no nonlinear absorption. The influence of thickness of the film and the incident laser intensity on the third-order optical nonlinearities have been investigated. Two figures of merit, W and T, have been calculated to be 9W9ffi 120b1 and 9T9¼ 051, respectively. All the results show that ETPPADT crystal has potential application on all-optical switching.