Abstract Bismuth telluride/reduced graphene oxide (Bi2Te3/rGO composites) was prepared by solvent-thermal method, and Bi2Te3/rGO-PVA (Polyvinyl alcohol) thin film was synthesized from drop coating method. The third-order nonlinear optical properties (NLO) and optical limiting (OL) performances of the solution samples and the film samples were studied using Z-scan test at the laser wavelength of 532 nm and 1064 nm with 10 Hz repetition frequency and 4 ns pulse width. In comparison with Bi2Te3, rGO and Bi2Te3+rGO (Bi2Te3 and rGO are mechanically stirred together), whether Bi2Te3/rGO solution sample or Bi2Te3/rGO-PVA film sample possess larger third order nonlinear absorption coefficients (β) and lower limiting thresholds due to the charge transfer and synergistic effect between Bi2Te3 and rGO. The limiting thresholds of Bi2Te3/rGO-PVA thin film samples (~0.19 J/cm2 at 532 nm and ~0.52 J/cm2 at 1064 nm) are lower than that of Bi2Te3/rGO solution due to much higher concentration in the film at the same level of linear transmission. The Bi2Te3/rGO-PVA thin film could be the promising optical limiting materials.

中文翻译：

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Bi2Te3/rGO薄膜的非线性吸收效应和光学限制特性

摘要 采用溶剂-热法制备碲化铋/还原氧化石墨烯（Bi2Te3/rGO复合材料），并采用滴涂法合成Bi2Te3/rGO-PVA（聚乙烯醇）薄膜。在激光波长532 nm和1064 nm、重复频率10 Hz和4 ns下，使用Z扫描测试研究溶液样品和薄膜样品的三阶非线性光学特性（NLO）和光学限制（OL）性能脉冲宽度。与 Bi2Te3 相比，rGO 和 Bi2Te3+rGO（Bi2Te3 和 rGO 被机械搅拌在一起），无论是 Bi2Te3/rGO 溶液样品还是 Bi2Te3/rGO-PVA 薄膜样品都具有更大的三阶非线性吸收系数（β）和更低的极限阈值，这是由于Bi2Te3 和 rGO 之间的电荷转移和协同效应。Bi2Te3/rGO-PVA 薄膜样品的极限阈值（532 nm 处~0.19 J/cm2 和 1064 nm 处~0.52 J/cm2）低于 Bi2Te3/rGO 溶液，因为在相同水平的线性传输。Bi2Te3/rGO-PVA 薄膜可能是有前途的光学限制材料。