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Giant optical anisotropy in a quasi-one-dimensional crystal
Nature Photonics ( IF 35.0 ) Pub Date : 2018-06-18 , DOI: 10.1038/s41566-018-0189-1
Shanyuan Niu , Graham Joe , Huan Zhao , Yucheng Zhou , Thomas Orvis , Huaixun Huyan , Jad Salman , Krishnamurthy Mahalingam , Brittany Urwin , Jiangbin Wu , Yang Liu , Thomas E. Tiwald , Stephen B. Cronin , Brandon M. Howe , Matthew Mecklenburg , Ralf Haiges , David J. Singh , Han Wang , Mikhail A. Kats , Jayakanth Ravichandran

Optical anisotropy is a fundamental building block for linear and nonlinear optical components such as polarizers, wave plates, and phase-matching elements1,2,3,4. In solid homogeneous materials, the strongest optical anisotropy is found in crystals such as calcite and rutile5,6. Attempts to enhance anisotropic light–matter interaction often rely on artificial anisotropic micro/nanostructures (form birefringence)7,8,9,10,11. Here, we demonstrate rationally designed, giant optical anisotropy in single crystals of barium titanium sulfide (BaTiS3). This material shows an unprecedented, broadband birefringence of up to 0.76 in the mid- to long-wave infrared, as well as a large dichroism window with absorption edges at 1.6 μm and 4.5 μm for light with polarization along two crystallographic axes on an easily accessible cleavage plane. The unusually large anisotropy is a result of the quasi-one-dimensional structure, combined with rational selection of the constituent ions to maximize the polarizability difference along different axes.



中文翻译:

准一维晶体中的巨光学各向异性

光学各向异性是线性和非线性光学组件(例如偏振器,波片和相位匹配元件1,2,3,4)的基本构建块。在固体均质材料中,在方解石和金红石5,6等晶体中发现最强的光学各向异性。试图增强各向异性的光-物质相互作用通常依赖于人工各向异性的微/纳米结构(形式双折射)7,8,9,10,11。在这里,我们证明了钡钛硫化物(BaTiS 3)。这种材料在中至长波红外光谱中显示出前所未有的宽带双折射,最高可达0.76,并且具有大的二向色窗,其吸收边缘分别为1.6μm和4.5μm,用于在两个晶体轴上易于偏振的偏振光分裂平面。异常大的各向异性是准一维结构的结果,再加上对组成离子的合理选择,可以最大程度地增加沿不同轴的极化率差异。

更新日期:2018-12-10
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