论文标题
PDSE2 DiCHALCEGONIDE 2D膜中的大和负KERR非线性
Large and negative Kerr nonlinearity in PdSe2 dichalcogenide 2D films
论文作者
论文摘要
我们报告了大型三阶非线性光学响应（PDSE2）膜，这是一种二维（2D）高贵金属二甲藻元化材料。开放孔径（OA）和闭合光圈（CA）Z扫描测量均在800 nm处使用飞秒脉冲激光器进行，以研究非线性吸收和非线性折射。在OA实验中，我们观察到光学限制行为源自Beta = 3.26 x 10-8 m/w的PDSE2膜中的两个大型照片吸收（TPA）。在CA实验中，我们测量了峰值响应的峰值响应，该响应对应于N2 = -1.33 x 10-15 m2/w的较大和负的非线性，比散装硅大两个数量级。我们还表征了N2的变化是激光强度的函数，观察到N2随入射激光强度的幅度降低，在高强度下在N2 = -9.96 x 10-16 m2/w时饱和。这些结果验证了2D PDSE2的大三阶非线性光学响应以及其高性能非线性光子设备的强大潜力。
We report a large third order nonlinear optical response of palladium diselenide (PdSe2) films, a two dimensional (2D) noble metal dichalcogenide material. Both open aperture (OA) and closed aperture (CA) Z scan measurements are performed with a femtosecond pulsed laser at 800 nm to investigate the nonlinear absorption and nonlinear refraction, respectively. In the OA experiment, we observe optical limiting behaviour originating from large two photo absorption (TPA) in the PdSe2 film of beta = 3.26 x 10-8 m/W. In the CA experiment, we measure a peak-valley response corresponding to a large and negative Kerr nonlinearity of n2 = -1.33 x 10-15 m2/W, two orders of magnitude larger than bulk silicon. We also characterize the variation of n2 as a function of laser intensity, observing that n2 decreases in magnitude with incident laser intensity, becoming saturated at n2 = -9.96 x 10-16 m2/W at high intensities. These results verify the large third order nonlinear optical response of 2D PdSe2 as well as its strong potential for high performance nonlinear photonic devices.
