Effect of Ba/Sr ratio on the nonlinear optical properties of Ba1-xSrxTiO3 (x = 0.1–0.9) thin films

Abstract

Perovskite-structured barium strontium titanate (Ba 1−x Sr x TiO 3 , x = 0.1-0.9) films have been epitaxially fabricated by using a pulsed-laser deposition technique. The third-order nonlinear optical properties were studied through a z-scan method, allowing the resolution of the nonlinear refractive and absorptive contributions to the responses. Although all the samples show almost the same value of nonlinear absorption coefficient, the extracted nonlinear refractive index of the sample of x = 0.3 is apparently larger than that of other samples. Dependency of the nonlinear optical properties on the Ba/Sr ratio is discussed in terms of the crystal phase transformation and metal-oxygen bond length of the selected materials.

The band gap and nonlinear optical susceptibility of SrSn1-xVxO3 films

“…Lead-free perovskite ABO 3 -structured oxides are promising optoelectronic materials due to their noticeable ferroelectric, piezoelectric, optical nonlinearity, best compatibility and environment-friendly characteristics (Pattipaka et al, 2019;Guo et al, 2022). Therefore, theoretical research and experimental explorations in the generation mechanism of optical nonlinearity and properties modulation have been intensively studied in the past decade and have made a great progress especially through A-site or B-site ion-doping (Sakhya, et al, 2017;Absike et al, 2022;Shereef et al, 2023;Wang et al, 2023Wang et al, ). 10.3389/fmats.2023 chosen for the desired qualities (Liu et al, 2014;Liu et al, 2017;Gao et al, 2019;Li et al, 2020).…”