arXiv 2008.009522020-08physics.opticsphysics.app-ph

用于集成非线性光子器件的BiOBr二维材料

BiOBr 2D materials for integrated nonlinear photonics devices

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

备注：: 10 pages, 4 figures, 113 references. arXiv admin note: substantial text overlap with arXiv:1909.02183; text overlap with arXiv:2003.04091
发表信息：: SPIE Photonics West 2020
DOI：: 10.1117/12.2546243

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摘要：

作为一种新型的先进二维层状材料，卤氧化铋，BiOX（X = Cl、Br、I）最近引起了极大的兴趣。在这项工作中，我们描述了三阶光学非线性的BiOBr，BiOX家族的重要成员。通过Z扫描技术表征了BiOBr纳米片在800 nm和1550 nm处的非线性吸收和克尔非线性。实验结果表明，BiOBr纳米片具有很大的非线性吸收系数（\b{eta} = 10-7 m/W）和克尔系数（n2 = 10-14 m2/W）。我们还注意到，当波长从800 nm改变到1550 nm时，BiOBr的n2从负到正反转符号。我们进一步表征了BiOBr纳米片的厚度依赖性非线性光学性质，发现\b{eta}和n2的幅度随着BiOBr纳米片厚度的减小而增加。最后，我们将BiOBr纳米片集成到硅集成波导中，并测量其插入损耗，提取的波导传播损耗与基于椭圆偏振测量的模式模拟结果吻合良好。这些结果证实了BiOBr作为高性能混合集成光子器件的有前途的非线性光学材料的强大潜力。

英文摘要：

As a new group of advanced 2D layered materials, bismuth oxyhalides, i.e., BiOX (X = Cl, Br, I), have recently become of great interest. In this work, we characterize the third-order optical nonlinearities of BiOBr, an important member of the BiOX family. The nonlinear absorption and Kerr nonlinearity of BiOBr nanoflakes at both 800 nm and 1550 nm are characterized via the Z-Scan technique. Experimental results show that BiOBr nanoflakes exhibit a large nonlinear absorption coefficient = \b{eta} = 10-7 m/W as well as a large Kerr coefficient n2 = 10-14 m2/W. We also note that the n2 of BiOBr reverses sign from negative to positive as the wavelength is changed from 800 nm to 1550 nm. We further characterize the thickness-dependent nonlinear optical properties of BiOBr nanoflakes, finding that the magnitudes of \b{eta} and n2 increase with decreasing thickness of the BiOBr nanoflakes. Finally, we integrate BiOBr nanoflakes into silicon integrated waveguides and measure their insertion loss, with the extracted waveguide propagation loss showing good agreement with mode simulations based on ellipsometry measurements. These results confirm the strong potential of BiOBr as a promising nonlinear optical material for high-performance hybrid integrated photonic devices.

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