Cavity Enhancement in Nonlinear Absorption and Photoluminescence of BaTiO3

We report the optical field enhanced nonlinear absorption and photoluminescence of one-dimensional photonic crystal with BaTiO3 as a defect, fabricated via RF sputtering technique. The homogeneity of layer thickness is confirmed through field emission scanning electron microscopy (FESEM). The cavity resonance mode is obtained at 532 nm and the quality factor of the microcaviy is found to be 48. Open aperture Z-scan and spectral measurement of microcavity show enhancement in nonlinear absorption and photoluminescence of BaTiO3 at 532 nm and 355 nm, respectively due to the strong field confinement around the defect layer. The experiments are in good agreement with the transfer matrix method simulations.