A remarkable third-order nonlinear optical behavior of single-crystal bromide organic-inorganic lead halide perovskite

The optical and structural aspects of methylamine lead bromide (MAPbBr3) single crystal (SC) are investigated. Based on Kramers-Kronig (KK) equations, the optical and dielectric parameters are investigated. The optical phonons Longitudinal optical (LO = 678 cm-1) and Transversal optical (TO = 578 cm-1) phonon modes are associated with the optical interaction with lattices in the visible region for MAPbBr3 SC. The Z-scan method is used to investigate the third-order nonlinear coefficients of SC hybrid organic-inorganic lead halide perovskites, MAPbBr3 with the 2.19 eV optical band gap energy. According to the nonlinear optical (NLO) properties, MAPbBr3 has a high third-order NLO response. The two-photon absorption (2PA) coefficient is found to be 3 x 10-4 cm W-1 using the transmission open aperture Z-scan technique. The nonlinear refraction (NLR) is obtained in the order of 10-9 cm2 W-1 utilizing a close aperture Z-scan, which revealed self-defocusing phenomena. This research shows that MAPbBr3 is a practical and low-priced nonlinear material for ultrafast photonics applications.

Automated summary

The optical and structural properties of methylamine lead bromide (MAPbBr3) single crystal (SC) were investigated and the optical and dielectric parameters were studied using Kramers-Kronig (KK) equations. The optical phonons of MAPbBr3 SC were found to be associated with the optical interaction with lattices in the visible region. The third-order nonlinear coefficients of MAPbBr3 were measured using the Z-scan method, showing a high third-order nonlinear response and self-defocusing phenomena.