Dong Ningning, Li Yuanxin, Feng Yanyan, Zhang Saifeng, Zhang Xiaoyan, Chang Chunxia, Fan Jintai, Zhang Long, Wang Jun
Key Laboratory of Materials for High-Power Laser, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China.
State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China.
Sci Rep. 2015 Sep 29;5:14646. doi: 10.1038/srep14646.
Nonlinear optical property of transition metal dichalcogenide (TMDC) nanosheet dispersions, including MoS2, MoSe2, WS2, and WSe2, was performed by using Z-scan technique with ns pulsed laser at 1064 nm and 532 nm. The results demonstrate that the TMDC dispersions exhibit significant optical limiting response at 1064 nm due to nonlinear scattering, in contrast to the combined effect of both saturable absorption and nonlinear scattering at 532 nm. Selenium compounds show better optical limiting performance than that of the sulfides in the near infrared. A liquid dispersion system based theoretical modelling is proposed to estimate the number density of the nanosheet dispersions, the relationship between incident laser fluence and the size of the laser generated micro-bubbles, and hence the Mie scattering-induced broadband optical limiting behavior in the TMDC dispersions.
利用Z扫描技术，在1064 nm和532 nm波长下使用纳秒脉冲激光，对包括MoS2、MoSe2、WS2和WSe2在内的过渡金属二硫属化物（TMDC）纳米片分散体的非线性光学性质进行了研究。结果表明，由于非线性散射，TMDC分散体在1064 nm处表现出显著的光学限幅响应，而在532 nm处则是饱和吸收和非线性散射的综合作用。在近红外区域，硒化合物比硫化物表现出更好的光学限幅性能。提出了一种基于液体分散体系的理论模型，以估计纳米片分散体的数密度、入射激光能量密度与激光产生的微气泡尺寸之间的关系，从而确定TMDC分散体中米氏散射引起的宽带光学限幅行为。
