Two organometallic complexes, [(C2H5)4N]2[Cu(C3S5)2] and [(C4H9)4N]2[Cu(C3S5)2], abbreviated as ECDT and BCDT,
were synthesized. Then the materials were doped in polymethylmethacrylate (PMMA) with the doping concentration
1 % by weight (1wt. %) using a spin-coating method. Their third-order nonlinear optical properties were studied by the
Z-scan technique with 25 ps pulse duration at 1064 nm. The results revealed that the two materials exhibit
self-defocusing effect and two-photo absorption at 1064 nm, the nonlinear refraction coefficient n2 are as high as
-8.077×10-9, -4.564×10-9 esu, and the two-photon absorption coefficients β are 9.258×10-10, 9.851×10-10 m/W,
respectively. All the results suggest that these materials have potential for the application of optical devices.
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