Enhancement of nonlinear optical property of Cu2O/Ag/Cu2O composite films induced by laser irradiation

• Published in: Journal of materials science Vol. 56; no. 16; pp. 9871 - 9882
• Main Authors: Liu, Tingting, Liu, Qingyou, Jiang, Yikai, Xia, Guohao, Hong, Ruijin, Tao, Chunxian, Wang, Qi, Lin, Hui, Han, Zhaoxia, Zhang, Dawei
• Format: Journal Article
• Language: English
• Published: New York Springer US 01.06.2021; Springer Nature B.V
• Subjects: Absorption; Bilayers; Characterization and Evaluation of Materials; Chemistry and Materials Science; Classical Mechanics; Copper base alloys; Copper oxides; Crystal defects; Crystallography and Scattering Methods; Electronic Materials; Ions; Irradiation; Lasers; Materials Science; Monolayers; Morphology; Nanocomposites; Nonlinear optics; Optical properties; Oxidation; Polymer Sciences; Sandwich structures; Silver; Solid Mechanics
• ISSN: 0022-2461; 1573-4803
• DOI: 10.1007/s10853-021-05928-9

In this paper, Cu 2 O/Ag/Cu 2 O nanocomposite films were obtained by controlling thermal oxidation Cu/Ag/Cu alloy films and then modified by laser irradiation under ambient condition. The effects of laser irradiation on the surface morphology, structure, optical properties and nonlinear performance of the sample were investigated. Those results indicate that the improvement of crystal quality, enhancement of Ag plasma peak and a large number of oxygen vacancy defects could be induced by laser irradiation. A switch from saturated absorption to reverse saturated absorption was observed in all samples with the excitation energy increasing. Compared with either single-layer or bilayer sample, the third-order nonlinear coefficient ( β ) of the sandwich structure samples was increased by 3.73 times after laser irradiation. In addition, the improvement of nonlinear performance of as-irradiated samples was also confirmed by finite difference time domain (FDTD) simulation results. Graphical Abstract