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arXiv 1909.02183physics.opticsphysics.app-ph
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Z扫描法测量BiOBr二维薄膜的高三阶克尔非线性光学特性

High third-order Kerr optical nonlinearity in BiOBr 2D films measured by the Z-scan method

Linnan Jia, Dandan Cui, Jiayang Wu, Haifeng Feng, Yunyi Yang, Tieshan Yang, Yang Qu, Yi Du, Weichang Hao, Baohua Jia, David J. Moss

摘要:

我们研究了BiOBr纳米片的非线性光学性质,BiOBr纳米片是一种新型的二维(2D)层状材料。我们通过Z扫描技术测量了BiOBr纳米片在800 nm和1550 nm处的非线性吸收和克尔非线性。我们观察到一个大的非线性吸收系数β = 10^-7 m ^2/W,以及一个大的克尔系数n2 = 10^-14 m^2/W。我们还观察到在n2中的强色散,当波长从800 nm变化到1550 nm时,它从负到正反转符号。此外,我们表征了BiOBr纳米片的非线性光学性质的厚度依赖性,观察到对于非常薄的薄片,β和n2的幅度都增加。最后,我们将BiOBr纳米片集成到硅集成波导上,并表征所得混合集成器件的线性光学特性,测量结果与使用独立椭圆偏振测量计算的参数一致。这些结果验证了BiOBr作为高性能混合集成光子器件的先进非线性光学材料的强大潜力。

英文摘要:

We investigate the nonlinear optical properties of BiOBr nanoflakes, a novel two-dimensional (2D) layered material from the Bismuth oxyhalide family. We measure the nonlinear absorption and Kerr nonlinearity of BiOBr nanoflakes at both 800 nm and 1550 nm via the Z scan technique. We observe a large nonlinear absorption coefficient beta = 10^-7 m/W as well as a large Kerr coefficient n2 = 10^-14 m^2/W. We also observe strong dispersion in n2, with it reversing sign from negative to positive as the wavelength varies from 800 nm to 1550 nm. In addition, we characterize the thickness-dependence of the nonlinear optical properties of BiOBr nanoflakes, observing that both the magnitudes of beta and n2 increase for very thin flakes. Finally, we integrate BiOBr nanoflakes onto silicon integrated waveguides and characterize the linear optical properties of the resulting hybrid integrated devices, with the measurements agreeing with calculated parameters using independent ellipsometry measurements. These results verify the strong potential of BiOBr as an advanced nonlinear optical material for high-performance hybrid integrated photonic devices.

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