▎ 摘　　要

Calix[4]resorcinarenes is a macrocyclic molecule that serves as a host for various metal ions and neutral molecules. The anisotropic nature of this molecule makes it attractive as a nonlinear optical material. Herein, we report the remarkable developments in nonlinear absorption and competent optical limiting action of noncovalently functionalized phenylcalix[4]resorcinarene (PCR) graphene oxide (GO) compared to its constituent compounds. The Fourier transform infrared spectrum, Raman spectrum, photoluminescence spectrum, and UV-Visible absorption spectrum of the composite (PCR-GO NC) reveal the modified optical properties of PCR. The nonlinear optical studies were investigated by z scan technique using Q switched Nd: YAG laser operating at 532 nm with 7 ns pulse width. Reverse saturable absorption primarily contributes to the absorptive nonlinearity of PCR and PCR-GO NC in the nanosecond regime. Compared to the bare PCR sample, an elevated nonlinear optical (NLO) response is observed for the nanocomposite (PCR-GO NC), and the enhancement factor in the absorptive nonlinearity is found to be 3.4. Moreover, the optical limiting behaviour of PCR-GO nanocomposite (limiting threshold value -0.91 J/cm(2)) is highly impressive compared to many of the benchmark results, making it suitable for making laser safety devices that can protect the human eye and devices from laser-induced damages. The phenomenally enhanced NLO behaviour of the nanocomposite could be derived from the combined effect of nonlinear absorption, photoinduced charge transfer between PCR and GO, and the intensified local field effect produced by GO.