Abstract We successfully fabricated 2D thin film by dispersing reduced graphene oxide into the PVA matrix and experimentally determined the third-order nonlinearity of reduced graphene oxide in the visible region of the spectrum (450–750 nm) by the combination of spectroscopic ellipsometry and femtosecond pump and probe spectroscopy. The utilization of chemical vapor deposition (CVD) graphene increases in nanophotonics technologies owing to the high tunability superior to noble metals. However, their scalable application is limited due to high-temperature, high-cost fabrication techniques, and complicated transfer procedures. Here, reduced graphene oxide is proposed to be a promising nominee, with relatively simple and low-cost fabrication techniques. Comparable nonlinearity to that of CVD graphene, and identical tunability that π conjugation electronic transitions dominates their nonlinear response, demonstrated that reduced graphene oxide is a viable alternative. The third-order susceptibility in the visible region reveals their substantial behavior to wavelength and pulse width of light in nonlinear state, which propels the movement of manipulating light at the nanoscale over broad wavelength.

中文翻译：

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用 CVD 石墨烯还原氧化石墨烯的宽带和比较三阶非线性

摘要 我们通过将还原氧化石墨烯分散到 PVA 基体中成功制备了二维薄膜，并通过光谱椭偏法和飞秒泵浦相结合，通过实验确定了还原氧化石墨烯在光谱可见区（450-750 nm）的三阶非线性。和探针光谱。由于优于贵金属的高可调性，化学气相沉积（CVD）石墨烯在纳米光子学技术中的使用增加。然而，由于高温、高成本的制造技术和复杂的转移程序，它们的可扩展应用受到限制。在这里，还原氧化石墨烯被认为是一种很有前途的提名者，其制造技术相对简单且成本低廉。与 CVD 石墨烯的非线性相当，以及 π 共轭电子跃迁支配其非线性响应的相同可调性，证明还原氧化石墨烯是一种可行的替代方案。可见光区的三阶磁化率揭示了它们在非线性状态下对光的波长和脉冲宽度的实质性行为，这推动了纳米级光在宽波长上的运动。