Abstract
WSe2/reduced graphene oxide (WSe2/rGO) composite has been synthesized by a facile solvothermal reaction and all the polyvinyl alcohol (PVA) films were prepared by simple drop casting method. The third order nonlinear optical (NLO) properties and optical limiting (OL) responses of WSe2/rGO solution and WSe2/rGO/PVA film were investigated using the Z-scan technique at 1064 nm and its second harmonic of 532 nm with 4 ns laser pulses. The results demonstrate that the third order NLO and optical limiting responses of the WSe2/rGO composite are significantly enhanced compared with WSe2, rGO and WSe2/GO composite, whether in the solution or in the PVA film. It can be attributed to the contribution of charge transfer process and synergistic effect between WSe2 and rGO moieties. Besides, the optical nonlinearity of WSe2/rGO/PVA film was larger than that of the WSe2/rGO solution. The WSe2/rGO/PVA film exhibits much larger nonlinear absorption coefficient (3.5 × 105 cm/GW) and much lower threshold value (0.25 J/cm2) with the input energy of 27 μJ at 532 nm. The results pave the way for the nonlinear optical properties with transition metal dichalcogenides (TMDs)/graphene composite in the optical limiting devices.
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