Third-order nonlinear optical properties of two organometallic complexes-doped PMMA thin film irradiated by picosecond pulse

摘要

Two organometallic complexes, [(C_2H_5)_4N]_2[Cu(C_3S_5)_2] and [(C_4H_9)_4N]_2[Cu(C_3S_5)_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 n_2 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.