同济大学化学科学与工程学院的张弛研究团队，揭示了紫外透明二维非线性光学材料Sc(IO3)2(NO3)的大光学各向异性。相关论文2020年11月4日发表于《德国应用化学》。

双折射是线性和非线性光学材料的基本光学性能。但目前为止，在紫外区域工作的晶体很难产生大的双折射。

在该研究中，研究人员首次揭示了2D稀土硝酸碘酸盐晶体Sc(IO3)2(NO3)具有大的光学各项异性。空气稳定的SINO拥有短的UV吸收限（283nm），对于硝酸盐系强的NLO效应（基准KH2PO4的4.0倍）和无机氧化物光学晶体的中最大双折射（546nm时Δn=0.348）。异常大的双折射和NLO效应是由于其具有优化的2D层状结构，以及高度极化和各向异性的构筑单元[IO3]和[NO3]。

该发现有助于具有大光学各项异性UV线性和NLO材料的发展，并促进其在光电器件上的应用。

附：英文原文

Title: Giant Optical Anisotropy in the UV‐Transparent 2D Nonlinear Optical Material Sc(IO3)2(NO3)

Author: Chao Wu, Xingxing Jiang, Zujian Wang, Zheshuai Lin, Zhipeng Huang, Xifa Long, Mark G. Humphrey, Chi Zhang

Issue&Volume:04 November 2020

Abstract: Birefringence is a fundamental optical property for linear and nonlinear optical (NLO) materials. Thus far, it has proved to be very difficult to engineer large birefringence in optical crystals functioning in the UV region. Herein, we report the first 2D rare‐earth iodate‐nitrate crystal Sc(IO3)2(NO3) (SINO), which is shown to exhibit giant optical anisotropy. Air‐stable SINO possesses a short UV absorption edge (298 nm), a strong NLO response (4.0 times that of benchmark KH2PO4) for the nitrate family, and the largest birefringence (Δn = 0.348 at 546 nm) of inorganic oxide optical crystals. The unusually large birefringence and NLO response can be attributed to an optimized 2D layered structure, combined with highly polarizable and anisotropic building units [IO3] and [NO3]. These findings will facilitate development of UV linear and NLO materials with giant optical anisotropy, and promote their potential applications in optoelectronic devices.

DOI: 10.1002/anie.202012456

Source: https://onlinelibrary.wiley.com/doi/10.1002/anie.202012456