Synthesis and third-order nonlinear optical properties of square planar complexes with donor-metal-acceptor structure

Chuluo Yang; Qiguang Yang; Jinhai Si; Shoubai Wang; Peixian Ye; Jingui Qin

doi:10.1117/12.318234

14 August 1998 Synthesis and third-order nonlinear optical properties of square planar complexes with donor-metal-acceptor structure

Chuluo Yang, Qiguang Yang, Jinhai Si, Shoubai Wang, Peixian Ye, Jingui Qin

Author Affiliations +

Proceedings Volume 3556, Electro-Optic and Second Harmonic Generation Materials, Devices, and Applications II; (1998) https://doi.org/10.1117/12.318234
Event: Photonics China '98, 1998, Beijing, China

Abstract

A new series of mixed-ligand (imine and dithiolate) metal complexes with square planar donor-metal-acceptor structure were designed and synthesized for the study of third-order nonlinear optical property. It was found that complexes containing 4,5-dimercapto-1,3-dithiole-2-thionate (dmit) ligand exhibit large third-order optical nonlinearity at 1064 nm. Their second molecular hyperpolarizability (gamma) ₁₁₁₁ is in the order of 10^-31 approximately 10^-30 esu. The excited-state enhancement of the third-order nonlinear optical susceptibility of complex (Py)₂Pt(mnt) (Py equals pyridine; mnt equals maleonitriledithiolate) was observed when the sample was optically pumped by either a picosecond or a nanosecond pump beam at the wavelength of 355 nm. For the picosecond case, the temporal behavior of the enhancement is characterized by a fast and a slow component, which is attributed to population of the first excited state S₁ and the second excited state S₂, respectively. For the nanosecond case, the enhancement of the nonlinearity is attributed predominantly to the first excited state S₁. The molecular hyperpolarizabilities of the first excited state S₁ and the second excited state S₂, i.e., (gamma) ^S1 and (gamma) ^S2, were determined to be 1.9 X 10^-31 and 1.0 X 10^-30 esu, respectively, which are much larger than that of the ground state ((gamma) ^g less than 5.6 X 10^-33 esu).

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Chuluo Yang, Qiguang Yang, Jinhai Si, Shoubai Wang, Peixian Ye, and Jingui Qin "Synthesis and third-order nonlinear optical properties of square planar complexes with donor-metal-acceptor structure", Proc. SPIE 3556, Electro-Optic and Second Harmonic Generation Materials, Devices, and Applications II, (14 August 1998); https://doi.org/10.1117/12.318234

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