Effect of thickness on nonlinear absorption characteristics of Ag-doped Ge28Sb12Se60 chalcogenide glass films

作者：Nannan Gong, Jianxing Zhao, Yinghao Cao, Yue Zhang, Jiaxuan Ren, Yao Zhou, Yinglin Song, Jianhong Zhou · 年份：2025 · DOI：10.1117/12.3058883 · 研究领域：Phase-change materials and chalcogenides、Nonlinear Optical Materials Studies、Glass properties and applications

Chalcogenide glass is widely used in the research and development of integrated photonic devices. Investigating its optical characteristics is of great significance both in theory and application, with film thickness being a crucial factor affecting the optical characteristics of these glass films. In this paper, the optical parameters of Ag doped GSS films at a wavelength of 532nm were studied using Z-scan and pump-probe techniques. The measurement results showed that the nonlinear absorption coefficient decreased from 1.37×10 -6 m/W to 0.82×10 -6 m/W with increasing film thickness. Moreover, the mechanism behind the nonlinear response is considered to be free carrier absorption, and there is a positive correlation between the carrier lifetime and the film thickness.