Tong Qing, Wang Yu-Hua, Yu Xiang-Xiang, Wang Bo, Liang Zhuang, Tang Meng, Wu An-Shun, Zhang Hai-Jun, Liang Feng, Xie Ya-Feng, Wang Jun
Hubei province Key Laboratory of Science in Metallurgical Process, Wuhan University of Science and Technology, Wuhan, 430081, People's Republic of China.
Nanotechnology. 2018 Apr 20;29(16):165706. doi: 10.1088/1361-6528/aaac13.
Graphene-ZnO (GZO) nanocomposites were synthesized by a modified solvothermal method, and characterized by transmission electron microscopy, x-ray diffraction, Raman spectra, and UV-vis absorption spectra. The controllable nonlinear optical (NLO) properties of as-prepared GZO nanocomposites were tested by an open-aperture Z-scan method with 1030 nm fs laser pulses; the tested results showed that there were five-photon absorption (5PA) at 46.8 GW cm, 3PA at 28.1 GW cm, 2PA at 18.7 GW cm, and a vital change from saturable absorption (SA) to reverse SA (RSA) with the increase of incident intensity. This was the first time that 5PA was found in GZO nanocomposites at such a low intensity, 46.8 GW cm. The tunable NLO property from SA to RSA and controllable multi-photon absorption provided a facile approach for their applications in optical, optoelectronic devices, and information storage.
采用改进的溶剂热法合成了石墨烯-氧化锌（GZO）纳米复合材料，并通过透射电子显微镜、X射线衍射、拉曼光谱和紫外-可见吸收光谱对其进行了表征。用1030 nm飞秒激光脉冲的开孔Z扫描法测试了所制备的GZO纳米复合材料的可控非线性光学（NLO）特性；测试结果表明，在46.8 GW/cm² 处存在五光子吸收（5PA），在28.1 GW/cm² 处存在三光子吸收（3PA），在18.7 GW/cm² 处存在双光子吸收（2PA），并且随着入射强度的增加，从饱和吸收（SA）到反饱和吸收（RSA）发生了重要变化。这是首次在如此低的强度（46.8 GW/cm²）下在GZO纳米复合材料中发现5PA。从SA到RSA的可调谐NLO特性和可控的多光子吸收为它们在光学、光电器件和信息存储中的应用提供了一种简便的方法。
