arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2005.01254physics.opticsphysics.app-ph
收藏

PdSe2二硫属化合物二维薄膜的大的负克尔非线性效应

Large and negative Kerr nonlinearity in PdSe2 dichalcogenide 2D films

Linnan Jia, Jiayang Wu, Tieshan Yang, Baohua Jia, David J. Moss

摘要:

报道了二维贵金属二硫属化合物材料二硒化钯(PdSe 2)薄膜的三阶非线性光学响应。使用800 nm的飞秒脉冲激光进行开孔(OA)和闭孔(CA)Z扫描测量,分别研究非线性吸收和非线性折射。在OA实验中,我们观察到光限幅行为源于β = 3.26 × 10-8 m/W的PdSe 2薄膜中的大二光吸收(TPA)。在CA实验中,我们测量了对应于n2 = -1.33 x 10-15 m2/W的大的负克尔非线性的峰谷响应,比体硅大两个数量级。我们还表征了n2作为激光强度的函数的变化,观察到n2随着入射激光强度的大小而减小,在高强度下在n2 = -9.96 x 10-16 m2/W处变得饱和。这些结果验证了2D PdSe 2的大的三阶非线性光学响应以及其作为高性能非线性光子器件的强大潜力。

英文摘要:

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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑